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Zeraouli G, Marconi M, Sullivan B, Wang S, Anaraki SZ, Hollinger R, Shlyaptsev S, Mariscal D, Rocca JJ. Multichannel Doppler fiber-imager spectrometer for spatiotemporal characterization of high-intensity laser-driven plasmas. Rev Sci Instrum 2024; 95:043506. [PMID: 38619372 DOI: 10.1063/5.0200285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Accepted: 04/01/2024] [Indexed: 04/16/2024]
Abstract
We demonstrate a flexible multichannel fiber-based imaging Doppler spectrometer to characterize plasmas in high intensity (≥1 × 1018 W/cm2) laser-plasma experiments at high repetition rates. This instrument collects data from ×21 different plasma locations combining optical fibers and a single imaging spectrometer. This diagnostic maps the plasma velocity evolution as a function of time with sub-pico-second resolution. Experimental results showing 2D velocity measurements of plasma with 20 μm spatial resolution are presented. Intensities of the order of 1018 W/cm2 were used to generate a plasma, while a much less intense, frequency doubled (400 nm), probe beam (1011 W/cm2) was used to measure the Doppler shift from the plasma critical surface. The instrument can be scaled to a larger number of channels (e.g., 100) still using a single spectrometer.
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Affiliation(s)
- G Zeraouli
- Colorado State University, Fort Collins, Colorado 80523, USA
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Marconi
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - B Sullivan
- Colorado State University, Fort Collins, Colorado 80523, USA
- XUV Lasers, Fort Collins, Colorado 80523, USA
| | - S Wang
- Colorado State University, Fort Collins, Colorado 80523, USA
| | | | - R Hollinger
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - S Shlyaptsev
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - D Mariscal
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J J Rocca
- Colorado State University, Fort Collins, Colorado 80523, USA
- XUV Lasers, Fort Collins, Colorado 80523, USA
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2
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Zeraouli G, Mariscal DA, Hollinger R, Anaraki SZ, Folsom EN, Grace E, Rusby D, Hill MP, Williams GJ, Scott GG, Sullivan B, Wang S, King J, Swanson KK, Simpson RA, Djordjevic BZ, Andrews S, Costa R, Cauble B, Albert F, Rocca JJ, Ma T. Flexible tape-drive target system for secondary high-intensity laser-driven sources. Rev Sci Instrum 2023; 94:123306. [PMID: 38117203 DOI: 10.1063/5.0180715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 11/22/2023] [Indexed: 12/21/2023]
Abstract
We present the development of a flexible tape-drive target system to generate and control secondary high-intensity laser-plasma sources. Its adjustable design permits the generation of relativistic MeV particles and x rays at high-intensity (i.e., ≥1 × 1018 W cm-2) laser facilities, at high repetition rates (>1 Hz). The compact and robust structure shows good mechanical stability and a high target placement accuracy (<4 μm RMS). Its compact and flexible design allows for mounting in both the horizontal and vertical planes, which makes it practical for use in cluttered laser-plasma experimental setups. The design permits ∼170° of access on the laser-driver side and 120° of diagnostic access at the rear. A range of adapted apertures have been designed and tested to be easily implemented to the targetry system. The design and performance testing of the tape-drive system in the context of two experiments performed at the COMET laser facility at the Lawrence Livermore National Laboratory and at the Advanced Lasers and Extreme Photonics (ALEPH) facility at Colorado State University are discussed. Experimental data showing that the designed prototype is also able to both generate and focus high-intensity laser-driven protons at high repetition rates are also presented.
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Affiliation(s)
- G Zeraouli
- Colorado State University, Fort Collins, Colorado 80523, USA
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D A Mariscal
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Hollinger
- Colorado State University, Fort Collins, Colorado 80523, USA
| | | | - E N Folsom
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E Grace
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D Rusby
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M P Hill
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G J Williams
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G G Scott
- Colorado State University, Fort Collins, Colorado 80523, USA
- STFC Central Laser Facility, Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 OQX, United Kingdom
| | - B Sullivan
- Colorado State University, Fort Collins, Colorado 80523, USA
- XUV Lasers, Fort Collins, Colorado 80523, USA
| | - S Wang
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - J King
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - K K Swanson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R A Simpson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Z Djordjevic
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Andrews
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Costa
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Cauble
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - F Albert
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J J Rocca
- Colorado State University, Fort Collins, Colorado 80523, USA
- XUV Lasers, Fort Collins, Colorado 80523, USA
| | - T Ma
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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3
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Schollmeier MS, Bekx JJ, Hartmann J, Schork E, Speicher M, Brodersen AF, Fazzini A, Fischer P, Gaul E, Gonzalez-Izquierdo B, Günther MM, Härle AK, Hollinger R, Kenney K, Park J, Rivas DE, Scutelnic V, Shpilman Z, Wang S, Rocca JJ, Korn G. Differentiating multi-MeV, multi-ion spectra with CR-39 solid-state nuclear track detectors. Sci Rep 2023; 13:18155. [PMID: 37875514 PMCID: PMC10598230 DOI: 10.1038/s41598-023-45208-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Accepted: 10/17/2023] [Indexed: 10/26/2023] Open
Abstract
The development of high intensity petawatt lasers has created new possibilities for ion acceleration and nuclear fusion using solid targets. In such laser-matter interaction, multiple ion species are accelerated with broad spectra up to hundreds of MeV. To measure ion yields and for species identification, CR-39 solid-state nuclear track detectors are frequently used. However, these detectors are limited in their applicability for multi-ion spectra differentiation as standard image recognition algorithms can lead to a misinterpretation of data, there is no unique relation between track diameter and particle energy, and there are overlapping pit diameter relationships for multiple particle species. In this report, we address these issues by first developing an algorithm to overcome user bias during image processing. Second, we use calibration of the detector response for protons, carbon and helium ions (alpha particles) from 0.1 to above 10 MeV and measurements of statistical energy loss fluctuations in a forward-fitting procedure utilizing multiple, differently filtered CR-39, altogether enabling high-sensitivity, multi-species particle spectroscopy. To validate this capability, we show that inferred CR-39 spectra match Thomson parabola ion spectrometer data from the same experiment. Filtered CR-39 spectrometers were used to detect, within a background of ~ 2 × 1011 sr-1 J-1 protons and carbons, (1.3 ± 0.7) × 108 sr-1 J-1 alpha particles from laser-driven proton-boron fusion reactions.
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Affiliation(s)
- M S Schollmeier
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany.
| | - J J Bekx
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany
| | - J Hartmann
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany
| | - E Schork
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany
| | - M Speicher
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany
| | - A F Brodersen
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany
| | - A Fazzini
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany
| | - P Fischer
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany
| | - E Gaul
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany
| | | | - M M Günther
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany
| | - A K Härle
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany
| | - R Hollinger
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, CO, 80523, USA
| | - K Kenney
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany
| | - J Park
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, CO, 80523, USA
| | - D E Rivas
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany
| | - V Scutelnic
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany
| | - Z Shpilman
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, CO, 80523, USA
| | - S Wang
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, CO, 80523, USA
| | - J J Rocca
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, CO, 80523, USA
- Physics Department, Colorado State University, Fort Collins, CO, 80523, USA
| | - G Korn
- Marvel Fusion GmbH, Theresienhöhe 12, 80339, Munich, Germany
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4
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Shpilman Z, Park J, Nedbailo R, Hollinger R, Wang S, Osovsky R, Afeyan B, Rocca JJ. Variable magnetic field electron spectrometer to measure hot electrons in the range of 50-460 keV. Rev Sci Instrum 2023; 94:2892281. [PMID: 37219386 DOI: 10.1063/5.0142238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 05/03/2023] [Indexed: 05/24/2023]
Abstract
Resonance absorption (RA) occurs when a p-polarized electromagnetic wave, obliquely incident on an inhomogeneous plasma, tunnels past its turning point and resonantly excites an electron plasma wave (EPW) at the critical density. This phenomenon is important, for instance, in the direct drive approach to inertial fusion energy and is a particular example of a wider phenomenon in plasma physics known as mode conversion, which is crucial for heating magnetic fusion devices, such as tokamaks, via RF heating. Direct measurement of these RA-generated EPW accelerated hot electrons, with energy in the range of a few tens to a few hundreds of keV, is a challenging task due to the relatively low deflecting magnetic fields needed. The solution described here is a magnetic electron spectrometer (MES) with a continually changing magnetic field, lower at the entrance of the MES and gradually increasing toward the end, that enables the measurement of a wide spectral range of electrons with energies between 50 and 460 keV. Electron spectra taken in a LaserNetUS RA experiment were acquired from plasmas generated by irradiating polymer targets with the combination of an ∼300 ps pulse followed by a series of ten high intensity 50-200 fs duration laser pulses from the ALEPH laser at Colorado State University. The high intensity beam is designed as spike trains of uneven duration and delay pulses in order to modify the RA phenomenon.
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Affiliation(s)
- Z Shpilman
- Plasma Physics Department, Soreq NRC, Yavne 81800, Israel
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - J Park
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - R Nedbailo
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - R Hollinger
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - S Wang
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - R Osovsky
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - B Afeyan
- Polymath Research, Inc., Pleasanton, California 94588, USA
| | - J J Rocca
- Colorado State University, Fort Collins, Colorado 80523, USA
- Physics Department, Colorado State University, Fort Collins, Colorado 80523, USA
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5
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Nedbailo R, Park J, Hollinger R, Wang S, Mariscal D, Morrison J, Song H, Zeraouli G, Scott GG, Ma T, Rocca JJ. Compact high repetition rate Thomson parabola ion spectrometer. Rev Sci Instrum 2023; 94:023505. [PMID: 36859067 DOI: 10.1063/5.0101859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 01/04/2023] [Indexed: 06/18/2023]
Abstract
We present the development of a compact Thomson parabola ion spectrometer capable of characterizing the energy spectra of various ion species of multi-MeV ion beams from >1020W/cm2 laser produced plasmas at rates commensurate with the highest available from any of the current and near-future PW-class laser facilities. This diagnostic makes use of a polyvinyl toluene based fast plastic scintillator (EJ-260), and the emitted light is collected using an optical imaging system coupled to a thermoelectrically cooled scientific complementary metal-oxide-semiconductor camera. This offers a robust solution for data acquisition at a high repetition rate, while avoiding the added complications and nonlinearities of micro-channel plate based systems. Different ion energy ranges can be probed using a modular magnet setup, a variable electric field, and a varying drift-distance. We have demonstrated operation and data collection with this system at up to 0.2 Hz from plasmas created by irradiating a solid target, limited only by the targeting system. With the appropriate software, on-the-fly ion spectral analysis will be possible, enabling real-time experimental control at multi-Hz repetition rates.
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Affiliation(s)
- R Nedbailo
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - J Park
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - R Hollinger
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - S Wang
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - D Mariscal
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Morrison
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - H Song
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - G Zeraouli
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - G G Scott
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Ma
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J J Rocca
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
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6
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Mariscal DA, Djordjević BZ, Anirudh R, Bremer T, Campbell PC, Feister S, Folsom E, Grace ES, Hollinger R, Jacobs SA, Kailkhura B, Kalantar D, Kemp AJ, Kim J, Kur E, Liu S, Ludwig J, Morrison J, Nedbailo R, Ose N, Park J, Rocca JJ, Scott GG, Simpson RA, Song H, Spears B, Sullivan B, Swanson KK, Thiagarajan J, Wang S, Williams GJ, Wilks SC, Wyatt M, Van Essen B, Zacharias R, Zeraouli G, Zhang J, Ma T. A flexible proton beam imaging energy spectrometer (PROBIES) for high repetition rate or single-shot high energy density (HED) experiments (invited). Rev Sci Instrum 2023; 94:023507. [PMID: 36859040 DOI: 10.1063/5.0101845] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 12/28/2022] [Indexed: 06/18/2023]
Abstract
The PROBIES diagnostic is a new, highly flexible, imaging and energy spectrometer designed for laser-accelerated protons. The diagnostic can detect low-mode spatial variations in the proton beam profile while resolving multiple energies on a single detector or more. When a radiochromic film stack is employed for "single-shot mode," the energy resolution of the stack can be greatly increased while reducing the need for large numbers of films; for example, a recently deployed version allowed for 180 unique energy measurements spanning ∼3 to 75 MeV with <0.4 MeV resolution using just 20 films vs 180 for a comparable traditional film and filter stack. When utilized with a scintillator, the diagnostic can be run in high-rep-rate (>Hz rate) mode to recover nine proton energy bins. We also demonstrate a deep learning-based method to analyze data from synthetic PROBIES images with greater than 95% accuracy on sub-millisecond timescales and retrained with experimental data to analyze real-world images on sub-millisecond time-scales with comparable accuracy.
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Affiliation(s)
- D A Mariscal
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Z Djordjević
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Anirudh
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Bremer
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P C Campbell
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Feister
- Department of Computer Science, California State University Channel Islands, Camarillo, California 93012, USA
| | - E Folsom
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E S Grace
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Hollinger
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - S A Jacobs
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Kailkhura
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D Kalantar
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A J Kemp
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Kim
- Center for Energy Research, University of California San Diego, La Jolla, California 92093, USA
| | - E Kur
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Liu
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Ludwig
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Morrison
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - R Nedbailo
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - N Ose
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Park
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - J J Rocca
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - G G Scott
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R A Simpson
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - H Song
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - B Spears
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Sullivan
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - K K Swanson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Thiagarajan
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Wang
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - G J Williams
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S C Wilks
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Wyatt
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Van Essen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Zacharias
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Zeraouli
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Zhang
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Ma
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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7
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Kraus BF, Gao L, Fox W, Hill KW, Bitter M, Efthimion PC, Moreau A, Hollinger R, Wang S, Song H, Rocca JJ. Ablating Ion Velocity Distributions in Short-Pulse-Heated Solids via X-Ray Doppler Shifts. Phys Rev Lett 2022; 129:235001. [PMID: 36563203 DOI: 10.1103/physrevlett.129.235001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 08/01/2022] [Accepted: 11/08/2022] [Indexed: 06/17/2023]
Abstract
Solids ablate under laser irradiation, but experiments have not previously characterized the initiation of this process at ultrarelativistic laser intensities. We present first measurements of bulk ion velocity distributions as ablation begins, captured as a function of depth via Doppler-shifted x-ray line emission from two viewing angles. Bayesian analysis indicates that bulk ions are either nearly stationary or flowing outward at the plasma sound speed. The measurements quantitatively constrain the laser-plasma ablation mechanism, suggesting that a steplike electrostatic potential structure drives solid disassembly.
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Affiliation(s)
- B F Kraus
- Department of Astrophysical Sciences, Princeton University, Princeton, 08544 New Jersey, USA
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, 08540 New Jersey, USA
| | - Lan Gao
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, 08540 New Jersey, USA
| | - W Fox
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, 08540 New Jersey, USA
| | - K W Hill
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, 08540 New Jersey, USA
| | - M Bitter
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, 08540 New Jersey, USA
| | - P C Efthimion
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, 08540 New Jersey, USA
| | - A Moreau
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, 80523 Colorado, USA
| | - R Hollinger
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, 80523 Colorado, USA
| | - Shoujun Wang
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, 80523 Colorado, USA
| | - Huanyu Song
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, 80523 Colorado, USA
| | - J J Rocca
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, 80523 Colorado, USA
- Physics Department, Colorado State University, Fort Collins, 80523 Colorado, USA
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8
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Zeraouli G, Mariscal D, Grace E, Scott GG, Swanson KK, Simpson R, Djordjevic BZ, Nedbailo R, Song H, Morrison J, Park J, Hollinger R, Wang S, Rocca JJ, Ma T. Ultra-compact x-ray spectrometer for high-repetition-rate laser-plasma experiments. Rev Sci Instrum 2022; 93:113508. [PMID: 36461516 DOI: 10.1063/5.0100970] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 09/28/2022] [Indexed: 06/17/2023]
Abstract
We present in this work the development of an ultra-compact, multi-channel x-ray spectrometer (UCXS). This diagnostic has been specially built and adapted to perform at high-repetition-rate (>1 Hz) for high-intensity, short-pulse laser plasma experiments. X-ray filters of varying materials and thicknesses are chosen to provide spectral resolution up to ΔE ≈ 1 keV over the x-ray energy range of 1-30 keV. These filters are distributed over a total of 25 channels, where each x-ray filter is coupled to a single scintillator. The UCXS is designed to detect and resolve a large variety of laser-driven x-ray sources such as low energy bremsstrahlung emission, fluorescence, and betatron radiation (up to 30 keV). Preliminary results from commissioning experiments at the ABL laser facility at Colorado State University are provided.
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Affiliation(s)
- G Zeraouli
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - D Mariscal
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E Grace
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G G Scott
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K K Swanson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Simpson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Z Djordjevic
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Nedbailo
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - H Song
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - J Morrison
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - J Park
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - R Hollinger
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - S Wang
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - J J Rocca
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - T Ma
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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9
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Swanson KK, Mariscal DA, Djordjevic BZ, Zeraouli G, Scott GG, Hollinger R, Wang S, Song H, Sullivan B, Nedbailo R, Rocca JJ, Ma T. Applications of machine learning to a compact magnetic spectrometer for high repetition rate, laser-driven particle acceleration. Rev Sci Instrum 2022; 93:103547. [PMID: 36319355 DOI: 10.1063/5.0101857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 09/20/2022] [Indexed: 06/16/2023]
Abstract
Accurately and rapidly diagnosing laser-plasma interactions is often difficult due to the time-intensive nature of the analysis and will only become more so with the rise of high repetition rate lasers and the desire to implement feedback on a commensurate timescale. Diagnostic analysis employing machine learning techniques can help address this problem while maintaining a high degree of accuracy. We report on the application of machine learning to the analysis of a scintillator-based electron spectrometer for experiments on high intensity, laser-plasma interactions at the Colorado State University Advanced Lasers and Extreme Photonics facility. Our approach utilizes a neural network trained on synthetic data and tested on experiments to extract the accelerated electron temperature. By leveraging transfer learning, we demonstrate an improvement in the neural network accuracy, decreasing the network error by 50%.
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Affiliation(s)
- K K Swanson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D A Mariscal
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Z Djordjevic
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Zeraouli
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G G Scott
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Hollinger
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - S Wang
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - H Song
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - B Sullivan
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - R Nedbailo
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - J J Rocca
- Colorado State University, Fort Collins, Colorado 80523, USA
| | - T Ma
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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10
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Kraus BF, Gao L, Hill KW, Bitter M, Efthimion PC, Hollinger R, Wang S, Song H, Nedbailo R, Rocca JJ, Mancini RC, Beatty CB, MacDonald MJ, Shepherd R. Streaked sub-ps-resolution x-ray line shapes and implications for solid-density plasma dynamics (invited). Rev Sci Instrum 2022; 93:103527. [PMID: 36319349 DOI: 10.1063/5.0101853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
A high-resolution x-ray spectrometer was coupled with an ultrafast x-ray streak camera to produce time-resolved line shape spectra measured from hot, solid-density plasmas. A Bragg crystal was placed near laser-produced plasma to maximize throughput; alignment tolerances were established by ray tracing. The streak camera produced single-shot, time-resolved spectra, heavily sloped due to photon time-of-flight differences, with sufficient reproducibility to accumulate photon statistics. The images are time-calibrated by the slope of streaked spectra and dewarped to generate spectra emitted at different times defined at the source. The streaked spectra demonstrate the evolution of spectral shoulders and other features on ps timescales, showing the feasibility of plasma parameter measurements on the rapid timescales necessary to study high-energy-density plasmas.
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Affiliation(s)
- B F Kraus
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - Lan Gao
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - K W Hill
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - M Bitter
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - P C Efthimion
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
| | - R Hollinger
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - Shoujun Wang
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - Huanyu Song
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - R Nedbailo
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - J J Rocca
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - R C Mancini
- Department of Physics, University of Nevada, Reno, Nevada 89557, USA
| | - C B Beatty
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M J MacDonald
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Shepherd
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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11
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Beier NF, Allison H, Efthimion P, Flippo KA, Gao L, Hansen SB, Hill K, Hollinger R, Logantha M, Musthafa Y, Nedbailo R, Senthilkumaran V, Shepherd R, Shlyaptsev VN, Song H, Wang S, Dollar F, Rocca JJ, Hussein AE. Homogeneous, Micron-Scale High-Energy-Density Matter Generated by Relativistic Laser-Solid Interactions. Phys Rev Lett 2022; 129:135001. [PMID: 36206410 DOI: 10.1103/physrevlett.129.135001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 08/01/2022] [Accepted: 08/26/2022] [Indexed: 06/16/2023]
Abstract
Short-pulse, laser-solid interactions provide a unique platform for studying complex high-energy-density matter. We present the first demonstration of solid-density, micron-scale keV plasmas uniformly heated by a high-contrast, 400 nm wavelength laser at intensities up to 2×10^{21} W/cm^{2}. High-resolution spectral analysis of x-ray emission reveals uniform heating up to 3.0 keV over 1 μm depths. Particle-in-cell simulations indicate the production of a uniformly heated keV plasma to depths of 2 μm. The significant bulk heating and presence of highly ionized ions deep within the target are attributed to the few MeV hot electrons that become trapped and undergo refluxing within the target sheath fields. These conditions enabled the differentiation of atomic physics models of ionization potential depression in high-energy-density environments.
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Affiliation(s)
- N F Beier
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
- STROBE, NSF Science and Technology Center, University of California, Irvine, California 92617, USA
| | - H Allison
- STROBE, NSF Science and Technology Center, University of California, Irvine, California 92617, USA
| | - P Efthimion
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08536, USA
| | - K A Flippo
- Los Alamos National Laboratory, P.O. Box 1163, Los Alamos, New Mexico 87545, USA
| | - L Gao
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08536, USA
| | - S B Hansen
- Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - K Hill
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08536, USA
| | - R Hollinger
- Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, Colorado 80521, USA
| | - M Logantha
- STROBE, NSF Science and Technology Center, University of California, Irvine, California 92617, USA
| | - Y Musthafa
- STROBE, NSF Science and Technology Center, University of California, Irvine, California 92617, USA
| | - R Nedbailo
- Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, Colorado 80521, USA
| | - V Senthilkumaran
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - R Shepherd
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - V N Shlyaptsev
- Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, Colorado 80521, USA
| | - H Song
- Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, Colorado 80521, USA
| | - S Wang
- Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, Colorado 80521, USA
| | - F Dollar
- STROBE, NSF Science and Technology Center, University of California, Irvine, California 92617, USA
| | - J J Rocca
- Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, Colorado 80521, USA
- Department of Physics, Colorado State University, Fort Collins, Colorado 80521, USA
| | - A E Hussein
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
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12
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Kraus BF, Gao L, Hill KW, Bitter M, Efthimion PC, Gomez TA, Moreau A, Hollinger R, Wang S, Song H, Rocca JJ, Mancini RC. Solid-Density Ion Temperature from Redshifted and Double-Peaked Stark Line Shapes. Phys Rev Lett 2021; 127:205001. [PMID: 34860067 DOI: 10.1103/physrevlett.127.205001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 08/27/2021] [Accepted: 10/01/2021] [Indexed: 06/13/2023]
Abstract
Heβ spectral line shapes are important for diagnosing temperature and density in many dense plasmas. This work presents Heβ line shapes measured with high spectral resolution from solid-density plasmas with minimized gradients. The line shapes show hallmark features of Stark broadening, including quantifiable redshifts and double-peaked structure with a significant dip between the peaks; these features are compared to models through a Markov chain Monte Carlo framework. Line shape theory using the dipole approximation can fit the width and peak separation of measured line shapes, but it cannot resolve an ambiguity between electron density n_{e} and ion temperature T_{i}, since both parameters influence the strength of quasistatic ion microfields. Here a line shape model employing a full Coulomb interaction for the electron broadening computes self-consistent line widths and redshifts through the monopole term; redshifts have different dependence on plasma parameters and thus resolve the n_{e}-T_{i} ambiguity. The measured line shapes indicate densities that are 80-100% of solid, identifying a regime of highly ionized but well-tamped plasma. This analysis also provides the first strong evidence that dense ions and electrons are not in thermal equilibrium, despite equilibration times much shorter than the duration of x-ray emission; cooler ions may arise from nonclassical thermalization rates or anomalous energy transport. The experimental platform and diagnostic technique constitute a promising new approach for studying ion-electron equilibration in dense plasmas.
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Affiliation(s)
- B F Kraus
- Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - Lan Gao
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - K W Hill
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - M Bitter
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - P C Efthimion
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - T A Gomez
- Sandia National Laboratory, Albuquerque, New Mexico 87123, USA
| | - A Moreau
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - R Hollinger
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - Shoujun Wang
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - Huanyu Song
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - J J Rocca
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
- Physics Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - R C Mancini
- Department of Physics, University of Nevada, Reno, Nevada 89557, USA
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13
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Kraus BF, Chien A, Gao L, Hill KW, Bitter M, Efthimion PC, Chen H, Schneider MB, Moreau A, Hollinger R, Wang S, Song H, Rocca JJ. Comparing plasma conditions in short-pulse-heated foils via fine-structure x-ray emission. Rev Sci Instrum 2021; 92:033525. [PMID: 33820090 DOI: 10.1063/5.0043524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 02/18/2021] [Indexed: 06/12/2023]
Abstract
Fine-structure x-ray spectra have been measured from foils with embedded tracer layers at two laser facilities. A suite of layered foils with thin Ti tracers under varied tamper layers was studied at both the Titan and the ALEPH 400 nm laser facilities, where Ti Heα emission was recorded using a high-resolution Bragg crystal spectrometer. Several indicators of plasma parameters are examined in the spectra, including temperature- and density-dependent line ratios and line broadening from Stark and opacity effects. Spectra indicate that (1) the plasma density at ALEPH is significantly higher than at Titan and (2) the electron temperature is high for near-surface layers at both facilities but drops more quickly with depth at ALEPH. These inferences of plasma conditions are consistent with differing levels of temporal contrast at each laser facility.
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Affiliation(s)
- B F Kraus
- Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA
| | - A Chien
- Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA
| | - Lan Gao
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - K W Hill
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - M Bitter
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - P C Efthimion
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - Hui Chen
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M B Schneider
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Moreau
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - R Hollinger
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - Shoujun Wang
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - Huanyu Song
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - J J Rocca
- Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523, USA
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14
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Bailly-Grandvaux M, Kawahito D, McGuffey C, Strehlow J, Edghill B, Wei MS, Alexander N, Haid A, Brabetz C, Bagnoud V, Hollinger R, Capeluto MG, Rocca JJ, Beg FN. Ion acceleration from microstructured targets irradiated by high-intensity picosecond laser pulses. Phys Rev E 2020; 102:021201. [PMID: 32942368 DOI: 10.1103/physreve.102.021201] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Accepted: 07/01/2020] [Indexed: 11/07/2022]
Abstract
Structures on the front surface of thin foil targets for laser-driven ion acceleration have been proposed to increase the ion source maximum energy and conversion efficiency. While structures have been shown to significantly boost the proton acceleration from pulses of moderate-energy fluence, their performance on tightly focused and high-energy lasers remains unclear. Here, we report the results of laser-driven three-dimensional (3D)-printed microtube targets, focusing on their efficacy for ion acceleration. Using the high-contrast (∼10^{12}) PHELIX laser (150J, 10^{21}W/cm^{2}), we studied the acceleration of ions from 1-μm-thick foils covered with micropillars or microtubes, which we compared with flat foils. The front-surface structures significantly increased the conversion efficiency from laser to light ions, with up to a factor of 5 higher proton number with respect to a flat target, albeit without an increase of the cutoff energy. An optimum diameter was found for the microtube targets. Our findings are supported by a systematic particle-in-cell modeling investigation of ion acceleration using 2D simulations with various structure dimensions. Simulations reproduce the experimental data with good agreement, including the observation of the optimum tube diameter, and reveal that the laser is shuttered by the plasma filling the tubes, explaining why the ion cutoff energy was not increased in this regime.
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Affiliation(s)
- M Bailly-Grandvaux
- Center for Energy Research, University of California San Diego, La Jolla, California 92093, USA
| | - D Kawahito
- Center for Energy Research, University of California San Diego, La Jolla, California 92093, USA
| | - C McGuffey
- Center for Energy Research, University of California San Diego, La Jolla, California 92093, USA
| | - J Strehlow
- Center for Energy Research, University of California San Diego, La Jolla, California 92093, USA.,Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093, USA
| | - B Edghill
- Center for Energy Research, University of California San Diego, La Jolla, California 92093, USA.,Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093, USA
| | - M S Wei
- Laboratory for Laser Energetics, Rochester, New York 14623, USA
| | - N Alexander
- General Atomics, San Diego, California 92121, USA
| | - A Haid
- General Atomics, San Diego, California 92121, USA
| | - C Brabetz
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt 64291, Germany
| | - V Bagnoud
- GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt 64291, Germany
| | - R Hollinger
- Physics Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - M G Capeluto
- Physics Department, Colorado State University, Fort Collins, Colorado 80523, USA.,Departamento de Física, FCEyN, UBA and IFIBA, CONICET, 1428 Buenos Aires, Argentina
| | - J J Rocca
- Physics Department, Colorado State University, Fort Collins, Colorado 80523, USA
| | - F N Beg
- Center for Energy Research, University of California San Diego, La Jolla, California 92093, USA.,Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093, USA
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15
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Maimone F, Mäder J, Lang R, Patchakui PT, Tinschert K, Hollinger R. Optical spectroscopy as a diagnostic tool for metal ion beam production with an ECRIS. Rev Sci Instrum 2019; 90:123108. [PMID: 31893820 DOI: 10.1063/1.5127571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Accepted: 11/27/2019] [Indexed: 06/10/2023]
Abstract
At GSI, the CAPRICE ECRIS is used to provide heavy ion beams to the UNILAC (Universal Linear Accelerator) accelerator. In order to satisfy the demand of metal ion beams, a resistively heated oven is routinely used. This evaporation technique allows the ion beam production from natural and enriched solid elements or compounds with high efficiency and low material consumption. Often it is required to provide high charge state ion beams from rare or extremely rare isotopes as 48Ca, e.g., for the investigation of super heavy elements. In order to maintain the ion beam stable for the entire scheduled beam time, the plasma inside the ion source must remain as stable as possible. The tuning of ion source parameters and oven power affecting the oven temperature and, in turn, the evaporation rate is necessary. A strong relationship between the microwave power and the oven heating was observed, thus affecting the power control, the plasma stability, and the material consumption. Hence, it was investigated how an optical spectrometer can be used as a predictive diagnostic tool to detect ion source instabilities. Furthermore, the effect of parasitic oven heating by coupling of microwaves was investigated. Optical emission spectroscopy was performed by analyzing the light from the plasma and from the oven through the extraction aperture. The measurements enabled us to distinguish between resistive heating and microwave heating. The results of this investigation are presented.
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Affiliation(s)
- F Maimone
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - J Mäder
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - R Lang
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - P T Patchakui
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - K Tinschert
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - R Hollinger
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
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16
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Adonin A, Hollinger R. Progress on MEVVA source VARIS at GSI. Rev Sci Instrum 2018; 89:052304. [PMID: 29864822 DOI: 10.1063/1.5017137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
For the last few years, the development of the VARIS (vacuum arc ion source) was concentrated on several aspects. One of them was the production of high current ion beams of heavy metals such as Au, Pb, and Bi. The requested ion charge state for these ion species is 4+. This is quite challenging to produce in vacuum arc driven sources for reasonable beam pulse length (>120 µs) due to the physical properties of these elements. However, the situation can be dramatically improved by using the composite materials or alloys with enhanced physical properties of the cathodes. Another aspect is an increase of the beam brilliance for intense U4+ beams by the optimization of the geometry of the extraction system. A new 7-hole triode extraction system allows an increase of the extraction voltage from 30 kV to 40 kV and also reduces the outer aperture of the extracted ion beam. Thus, a record beam brilliance for the U4+ beam in front of the RFQ (Radio-Frequency Quadrupole) has been achieved, exceeding the RFQ space charge limit for an ion current of 15 mA. Several new projectiles in the middle-heavy region have been successfully developed from VARIS to fulfill the requirements of the future FAIR (Facility for Antiproton and Ion Research) programs. An influence of an auxiliary gas on the production performance of certain ion charge states as well as on operation stability has been investigated. The optimization of the ion source parameters for a maximum production efficiency and highest particle current in front of the RFQ has been performed. The next important aspect of the development will be the increase of the operation repetition rate of VARIS for all elements especially for uranium to 2.7 Hz in order to provide the maximum availability of high current ion beams for future FAIR experiments.
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Affiliation(s)
- A Adonin
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - R Hollinger
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
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17
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Ullmann C, Adonin A, Berezov R, Chauvin N, Delferrière O, Fils J, Hollinger R, Kester O, Senée F, Tuske O. Investigation of ion beam space charge compensation with a 4-grid analyzer. Rev Sci Instrum 2016; 87:02B938. [PMID: 26932110 DOI: 10.1063/1.4939782] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Experiments to investigate the space charge compensation of pulsed high-current heavy ion beams are performed at the GSI ion source text benches with a 4-grid analyzer provided by CEA/Saclay. The technical design of the 4-grid analyzer is revised to verify its functionality for measurements at pulsed high-current heavy ion beams. The experimental investigation of space charge compensation processes is needed to increase the performance and quality of current and future accelerator facilities. Measurements are performed directly downstream a triode extraction system mounted to a multi-cusp ion source at a high-current test bench as well as downstream the post-acceleration system of the high-current test injector (HOSTI) with ion energies up to 120 keV/u for helium and argon. At HOSTI, a cold or hot reflex discharge ion source is used to change the conditions for the measurements. The measurements were performed with helium, argon, and xenon and are presented. Results from measurements with single aperture extraction systems are shown.
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18
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Berezov R, Brodhage R, Chauvin N, Delferriere O, Fils J, Hollinger R, Ivanova V, Tuske O, Ullmann C. High intensity proton injector for facility of antiproton and ion research. Rev Sci Instrum 2016; 87:02A705. [PMID: 26931923 DOI: 10.1063/1.4932393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The high current ion source with the low energy beam transport (LEBT) will serve as injector into the proton LINAC to provide primary proton beam for the production of antiprotons. The pulsed ion source developed and built in CEA/Saclay operates with a frequency of 2.45 GHz based on ECR plasma production with two coils with 87.5 mT magnetic field necessary for the electron cyclotron resonance. The compact LEBT consists of two solenoids with a maximum magnetic field of 500 mT including two integrated magnetic steerers to adjust the horizontal and vertical beam positions. The total length of the compact LEBT is 2.3 m and was made as short as possible to reduced emittance growth along the beam line. To measure ion beam intensity behind the pentode extraction system, between solenoids and at the end of the beam line, two current transformers and a Faraday cup are installed. To get information about the beam quality and position, the diagnostic chamber with different equipment will be installed between the two solenoids. This article reports the current status of the proton injector for the facility of antiproton and ion research.
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Affiliation(s)
- R Berezov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - R Brodhage
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - N Chauvin
- Commissariat à l'Energie Atomique et aux Energies Alternatives, IRFU, F-91191 Gif-sur-Yvette, France
| | - O Delferriere
- Commissariat à l'Energie Atomique et aux Energies Alternatives, IRFU, F-91191 Gif-sur-Yvette, France
| | - J Fils
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - R Hollinger
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - V Ivanova
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - O Tuske
- Commissariat à l'Energie Atomique et aux Energies Alternatives, IRFU, F-91191 Gif-sur-Yvette, France
| | - C Ullmann
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
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19
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Maimone F, Tinschert K, Endermann M, Hollinger R, Kondrashev S, Lang R, Mäder J, Patchakui PT, Spädtke P. Investigation of pulsed mode operation with the frequency tuned CAPRICE ECRIS. Rev Sci Instrum 2016; 87:02A712. [PMID: 26931930 DOI: 10.1063/1.4933339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In order to increase the intensity of the highly charged ions produced by the Electron Cyclotron Resonance Ion Sources (ECRISs), techniques like the frequency tuning and the afterglow mode have been developed and in this paper the effect on the ion production is shown for the first time when combining both techniques. Recent experimental results proved that the tuning of the operating frequency of the ECRIS is a promising technique to achieve higher ion currents of higher charge states. On the other hand, it is well known that the afterglow mode of the ECRIS operation can provide more intense pulsed ion beams in comparison with the continuous wave (cw) operation. These two techniques can be combined by pulsing the variable frequency signal driving the traveling wave tube amplifier which provides the high microwave power to the ECRIS. In order to analyze the effect of these two combined techniques on the ion source performance, several experiments were carried out on the pulsed frequency tuned CAPRICE (Compacte source A Plusiers Résonances Ionisantes Cyclotron Electroniques)-type ECRIS. Different waveforms and pulse lengths have been investigated under different settings of the ion source. The results of the pulsed mode have been compared with those of cw operation.
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Affiliation(s)
- F Maimone
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - K Tinschert
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - M Endermann
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - R Hollinger
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - S Kondrashev
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - R Lang
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - J Mäder
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - P T Patchakui
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - P Spädtke
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
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Adonin A, Barth W, Heymach F, Hollinger R, Vormann H, Yakushev A. Production of high current proton beams using complex H-rich molecules at GSI. Rev Sci Instrum 2016; 87:02B709. [PMID: 26932072 DOI: 10.1063/1.4934620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this contribution, the concept of production of intense proton beams using molecular heavy ion beams from an ion source is described, as well as the indisputable advantages of this technique for operation of the GSI linear accelerator. The results of experimental investigations, including mass-spectra analysis and beam emittance measurements, with different ion beams (CH3(+),C2H4(+),C3H7(+)) using various gaseous and liquid substances (methane, ethane, propane, isobutane, and iodoethane) at the ion source are summarized. Further steps to improve the ion source and injector performance with molecular beams are depicted.
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Affiliation(s)
- A Adonin
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt 64291, Germany
| | - W Barth
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt 64291, Germany
| | - F Heymach
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt 64291, Germany
| | - R Hollinger
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt 64291, Germany
| | - H Vormann
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt 64291, Germany
| | - A Yakushev
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt 64291, Germany
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21
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Khuyagbaatar J, Yakushev A, Düllmann CE, Ackermann D, Andersson LL, Asai M, Block M, Boll RA, Brand H, Cox DM, Dasgupta M, Derkx X, Di Nitto A, Eberhardt K, Even J, Evers M, Fahlander C, Forsberg U, Gates JM, Gharibyan N, Golubev P, Gregorich KE, Hamilton JH, Hartmann W, Herzberg RD, Heßberger FP, Hinde DJ, Hoffmann J, Hollinger R, Hübner A, Jäger E, Kindler B, Kratz JV, Krier J, Kurz N, Laatiaoui M, Lahiri S, Lang R, Lommel B, Maiti M, Miernik K, Minami S, Mistry A, Mokry C, Nitsche H, Omtvedt JP, Pang GK, Papadakis P, Renisch D, Roberto J, Rudolph D, Runke J, Rykaczewski KP, Sarmiento LG, Schädel M, Schausten B, Semchenkov A, Shaughnessy DA, Steinegger P, Steiner J, Tereshatov EE, Thörle-Pospiech P, Tinschert K, Torres De Heidenreich T, Trautmann N, Türler A, Uusitalo J, Ward DE, Wegrzecki M, Wiehl N, Van Cleve SM, Yakusheva V. 48Ca+249Bk fusion reaction leading to element Z = 117: long-lived α-decaying 270Db and discovery of 266Lr. Phys Rev Lett 2014; 112:172501. [PMID: 24836239 DOI: 10.1103/physrevlett.112.172501] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2014] [Indexed: 06/03/2023]
Abstract
The superheavy element with atomic number Z=117 was produced as an evaporation residue in the (48)Ca+(249)Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their α-decay products was studied using a detection setup that allowed measuring decays of single atomic nuclei with half-lives between sub-μs and a few days. Two decay chains comprising seven α decays and a spontaneous fission each were identified and are assigned to the isotope (294)117 and its decay products. A hitherto unknown α-decay branch in (270)Db (Z = 105) was observed, which populated the new isotope (266)Lr (Z = 103). The identification of the long-lived (T(1/2) = 1.0(-0.4)(+1.9) h) α-emitter (270)Db marks an important step towards the observation of even more long-lived nuclei of superheavy elements located on an "island of stability."
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Affiliation(s)
- J Khuyagbaatar
- Helmholtz Institute Mainz, 55099 Mainz, Germany and GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - A Yakushev
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - Ch E Düllmann
- Helmholtz Institute Mainz, 55099 Mainz, Germany and GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - D Ackermann
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | | | - M Asai
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - M Block
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - R A Boll
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - H Brand
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - D M Cox
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - M Dasgupta
- The Australian National University, Canberra, Australian Capital Territory 0200, Australia
| | - X Derkx
- Helmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - A Di Nitto
- Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - K Eberhardt
- Helmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - J Even
- Helmholtz Institute Mainz, 55099 Mainz, Germany
| | - M Evers
- The Australian National University, Canberra, Australian Capital Territory 0200, Australia
| | | | | | - J M Gates
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - N Gharibyan
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | | | - K E Gregorich
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - J H Hamilton
- Vanderbilt University, Nashville, Tennessee 37235, USA
| | - W Hartmann
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - R-D Herzberg
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - F P Heßberger
- Helmholtz Institute Mainz, 55099 Mainz, Germany and GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - D J Hinde
- The Australian National University, Canberra, Australian Capital Territory 0200, Australia
| | - J Hoffmann
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - R Hollinger
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - A Hübner
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - E Jäger
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - B Kindler
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - J V Kratz
- Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - J Krier
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - N Kurz
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - M Laatiaoui
- Helmholtz Institute Mainz, 55099 Mainz, Germany
| | - S Lahiri
- Saha Institute of Nuclear Physics, Kolkata 700064, India
| | - R Lang
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - B Lommel
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - M Maiti
- Saha Institute of Nuclear Physics, Kolkata 700064, India
| | - K Miernik
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S Minami
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - A Mistry
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - C Mokry
- Helmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - H Nitsche
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | | | - G K Pang
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - P Papadakis
- University of Liverpool, Liverpool L69 7ZE, United Kingdom and University of Jyväskylä, 40351 Jyväskylä, Finland
| | - D Renisch
- Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - J Roberto
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | | | - J Runke
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - K P Rykaczewski
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | | | - M Schädel
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany and Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - B Schausten
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | | | - D A Shaughnessy
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - P Steinegger
- Paul Scherrer Institute, 5232 Villigen, Switzerland and University of Bern, 3012 Bern, Switzerland
| | - J Steiner
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | - E E Tereshatov
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - P Thörle-Pospiech
- Helmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - K Tinschert
- GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
| | | | - N Trautmann
- Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - A Türler
- Paul Scherrer Institute, 5232 Villigen, Switzerland and University of Bern, 3012 Bern, Switzerland
| | - J Uusitalo
- University of Jyväskylä, 40351 Jyväskylä, Finland
| | - D E Ward
- Lund University, 22100 Lund, Sweden
| | - M Wegrzecki
- Institute of Electron Technology, 02-668 Warsaw, Poland
| | - N Wiehl
- Helmholtz Institute Mainz, 55099 Mainz, Germany and Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - S M Van Cleve
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - V Yakusheva
- Helmholtz Institute Mainz, 55099 Mainz, Germany
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Adonin AA, Hollinger R. Beam brilliance investigation of high current ion beams at GSI heavy ion accelerator facility. Rev Sci Instrum 2014; 85:02A727. [PMID: 24593461 DOI: 10.1063/1.4833931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this work the emittance measurements of high current Ta-beam provided by VARIS (Vacuum Arc Ion Source) ion source are presented. Beam brilliance as a function of beam aperture at various extraction conditions is investigated. Influence of electrostatic ion beam compression in post acceleration gap on the beam quality is discussed. Use of different extraction systems (single aperture, 7 holes, and 13 holes) in order to achieve more peaked beam core is considered. The possible ways to increase the beam brilliance are discussed.
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Affiliation(s)
- A A Adonin
- Linac and Operations/Ion Sources, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
| | - R Hollinger
- Linac and Operations/Ion Sources, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
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Ullmann C, Berezov R, Fils J, Chauvin N, Delferriere O, Hollinger R, Kester O, Vinzenz W. The proton injector for the accelerator facility of antiproton and ion research (FAIR). Rev Sci Instrum 2014; 85:02A952. [PMID: 24593531 DOI: 10.1063/1.4826340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The new international accelerator facility for antiproton and ion research (FAIR) at GSI in Darmstadt, Germany, is one of the largest research projects worldwide and will provide an antiproton production rate of 7 × 10(10) cooled pbars per hour. This is equivalent to a primary proton beam current of 2 × 10(16) protons per hour. For this request a high intensity proton linac (p-linac) will be built with an operating rf-frequency of 325 MHz to accelerate a 35 mA proton beam at 70 MeV, using conducting crossed-bar H-cavities. The repetition rate is 4 Hz with beam pulse length of 36 μs. The microwave ion source and low energy beam transport developed within a joint French-German collaboration GSI/CEA-SACLAY will serve as an injector of the compact proton linac. The 2.45 GHz ion source allows high brightness ion beams at an energy of 95 keV and will deliver a proton beam current of 100 mA at the entrance of the radio frequency quadrupole (RFQ) within an acceptance of 0.3π mm mrad (norm., rms).
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Affiliation(s)
- C Ullmann
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - R Berezov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - J Fils
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - N Chauvin
- Commissariat à l'Energie Atomique et aux Energies Alternatives, IRFU, F-91191-Gif-sur-Yvette, France
| | - O Delferriere
- Commissariat à l'Energie Atomique et aux Energies Alternatives, IRFU, F-91191-Gif-sur-Yvette, France
| | - R Hollinger
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - O Kester
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
| | - W Vinzenz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
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Adonin A, Hollinger R. Development of high current Bi and Au beams for the synchrotron operation at the GSI accelerator facility. Rev Sci Instrum 2012; 83:02A505. [PMID: 22380201 DOI: 10.1063/1.3670743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this work, the latest results of developing high current ion beams of Au and Bi at GSI facility are described. The difficulties in the production of required charge state in vacuum arc discharge ion sources using the pure materials in the cathodes are discussed. As a possible solution, admix of a small amount of more refractory metal to the cathode material is considered. As a significant result, a dramatic improvement in the production of high charge state Bi ions using the mixed Bi-Cu cathodes (with 8%-15% of Cu admixed) compared to pure Bi cathodes is presented. The preliminary results of investigation of the material structure of Bi-Cu cathodes are discussed. As a next step, it is planned to test the composition of Au with Pd, Zr, and Fe as cathode materials.
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Affiliation(s)
- A Adonin
- LINAC Group, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany.
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Adonin A, Hollinger R, Spädtke P. Measurements of transverse ion beam emittance generated by high current ion sources at the GSI test injector facility HOSTI. Rev Sci Instrum 2010; 81:02B707. [PMID: 20192447 DOI: 10.1063/1.3273066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The first emittance measurements with a new test injector facility (HOSTI) at GSI, designed for optimization of high current beam injection scheme, are discussed. The emittance of the ion beam (88 kV, Ar(1+) ions) was investigated as a function of various parameters related to the ion source, extraction, and postacceleration systems and the optimum parameters for future low energy beam transport line are concluded. The preliminary results of the emittance measurements with superconducting solenoid are presented. The influence of the focusing strength as well as the longitudinal field shape of the solenoid on the beam emittance is described.
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Affiliation(s)
- A Adonin
- Ion Source Group, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
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Hollinger R, Spädtke P. High current ion beam transport using solenoids. Rev Sci Instrum 2008; 79:02B704. [PMID: 18315195 DOI: 10.1063/1.2801351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In the framework of the future project FAIR several upgrade programs and construction of new facilities are in progress such as the U(4+) upgrade for the existing high current injector and the new 70 MeV proton injector. For both injectors solenoids in the low energy beam transport section are foreseen to inject the beam into the following rf accelerator. The paper presents beam quality measurements of high current ion beams behind a solenoid using a slit-grid emittance measurement device, viewing targets, and a pepper pot measurement device at the high current test bench at GSI.
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Affiliation(s)
- R Hollinger
- GSI, Gesellschaft für Schwerionenforschung mbH, Planckstrasse 1, Darmstadt, Germany
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Hollinger R, Galonska M, Gutermuth B, Heymach F, Krichbaum H, Leible KD, Ochs K, Schäffer P, Schäffer S, Spädtke P, Stork M, Wesp A, Mayr R. Status of high current ion source operation at the GSI accelerator facility. Rev Sci Instrum 2008; 79:02C703. [PMID: 18315256 DOI: 10.1063/1.2801623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Vacuum arc ion sources, Penning ion sources, and filament driven multicusp ion sources are used for the production of high current ion beams of a variety of metallic and gaseous ions at the GSI accelerator facility. For accelerator operation, the ion sources have to provide a stable beam over a long period of time with an energy of 2.2 keV/u and a maximum mass over charge ratio of 65. The status of beam time operation at the high current injector is presented here giving an outline on important ion source data, such as ion beam current, ion beam spectrum, transversal emittance, life time, duty factor, and transmission along the low energy beam transport section.
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Affiliation(s)
- R Hollinger
- GSI, Gesellschaft für Schwerionenforschung mbH, Planckstrasse 1, Darmstadt, Germany
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Abstract
Using roadside survey data on 2044 drivers in a southern metropolitan community, the potential of gender roles for explaining the role behavior of female drinking drivers was examined. Although female drinking drivers are like female nondrinking drivers in previous driving and drinking-driving experiences, overall they are more like male drinking drivers. Both female and male drinking drivers tend to drive in similar places and to be on the roads at similar times and days. They also carry similar numbers and types of passengers. The greater similarity of female drinking drivers to male drinking drivers than to nondrinking female drivers suggests caution in leaning too heavily on gender roles as explanations of female drinking-driving behavior.
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Hollinger R. An interview with: Richard Hollinger. Hosp Secur Saf Manage 1985; 5:13-5. [PMID: 10271041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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