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Bohlen S, Brümmer T, Grüner F, Lindstrøm CA, Meisel M, Staufer T, Streeter MJV, Veale MC, Wood JC, D'Arcy R, Põder K, Osterhoff J. In Situ Measurement of Electron Energy Evolution in a Laser-Plasma Accelerator. PHYSICAL REVIEW LETTERS 2022; 129:244801. [PMID: 36563240 DOI: 10.1103/physrevlett.129.244801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 07/22/2022] [Accepted: 10/12/2022] [Indexed: 06/17/2023]
Abstract
We report on a novel, noninvasive method applying Thomson scattering to measure the evolution of the electron beam energy inside a laser-plasma accelerator with high spatial resolution. The determination of the local electron energy enabled the in-situ detection of the acting acceleration fields without altering the final beam state. In this Letter we demonstrate that the accelerating fields evolve from (265±119) GV/m to (9±4) GV/m in a plasma density ramp. The presented data show excellent agreement with particle-in-cell simulations. This method provides new possibilities for detecting the dynamics of plasma-based accelerators and their optimization.
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Affiliation(s)
- S Bohlen
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg and Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - T Brümmer
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - F Grüner
- Universität Hamburg and Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - C A Lindstrøm
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - M Meisel
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg and Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - T Staufer
- Universität Hamburg and Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - M J V Streeter
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Centre for Plasma Physics, School of Mathematics and Physics, Queen's University Belfast, BT7 1NN, Belfast, United Kingdom
| | - M C Veale
- UKRI STFC, Rutherford Appleton Laboratory, Didcot, OX11 0QX, United Kingdom
| | - J C Wood
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - R D'Arcy
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - K Põder
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - J Osterhoff
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
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2
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Liang E, Zheng KQ, Yao K, Lo W, Hasson H, Zhang A, Burns M, Wong WH, Zhang Y, Dashko A, Quevedo H, Ditmire T, Dyer G. A scintillator attenuation spectrometer for intense gamma-rays. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:063103. [PMID: 35777994 DOI: 10.1063/5.0082131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
A new type of compact high-resolution high-sensitivity gamma-ray spectrometer for short-pulse intense gamma-rays (250 keV to 50 MeV) has been developed by combining the principles of scintillators and attenuation spectrometers. The first prototype of this scintillator attenuation spectrometer (SAS) was tested successfully in Trident laser experiments at LANL. Later versions have been used extensively in the Texas Petawatt laser experiments in Austin, TX, and more recently in OMEGA-EP laser experiments at LLE, Rochester, NY. The SAS is particularly useful for high-repetition-rate laser applications. Here, we give a concise description of the design principles, capabilities, and sample preliminary results of the SAS.
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Affiliation(s)
- E Liang
- Physics and Astronomy Department, Rice University, Houston, Texas 77005, USA
| | - K Q Zheng
- Physics and Astronomy Department, Rice University, Houston, Texas 77005, USA
| | - K Yao
- Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, California 91125, USA
| | - W Lo
- Physics and Astronomy Department, Rice University, Houston, Texas 77005, USA
| | - H Hasson
- Physics Department, University of Rochester, Rochester, New York 14627, USA
| | - A Zhang
- Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, California 91125, USA
| | - M Burns
- Physics and Astronomy Department, Rice University, Houston, Texas 77005, USA
| | - W H Wong
- M.D. Anderson Cancer Center, Diagnostic Imaging Division, Houston, Texas 77005, USA
| | - Y Zhang
- M.D. Anderson Cancer Center, Diagnostic Imaging Division, Houston, Texas 77005, USA
| | - A Dashko
- High Energy Density Science Center, University of Texas at Austin, Austin, Texas 78712, USA
| | - H Quevedo
- High Energy Density Science Center, University of Texas at Austin, Austin, Texas 78712, USA
| | - T Ditmire
- High Energy Density Science Center, University of Texas at Austin, Austin, Texas 78712, USA
| | - G Dyer
- SLAC National Accelerator Laboratory, Linac Coherent Light Source, Menlo Park, California 94025, USA
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3
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Laso Garcia A, Hannasch A, Molodtsova M, Ferrari A, Couperus Cadabağ JP, Downer MC, Irman A, Kraft SD, Metzkes-Ng J, Naumann L, Prencipe I, Schramm U, Zeil K, Zgadzaj R, Ziegler T, Cowan TE. Calorimeter with Bayesian unfolding of spectra of high-flux broadband x rays. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:043102. [PMID: 35489906 DOI: 10.1063/5.0078443] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 03/13/2022] [Indexed: 06/14/2023]
Abstract
We report the development of a multipurpose differential x-ray calorimeter with a broad energy bandwidth. The absorber architecture is combined with a Bayesian unfolding algorithm to unfold high energy x-ray spectra generated in high-intensity laser-matter interactions. Particularly, we show how to extract absolute energy spectra and how our unfolding algorithm can reconstruct features not included in the initial guess. The performance of the calorimeter is evaluated via Monte Carlo generated data. The method accuracy to reconstruct electron temperatures from bremsstrahlung is shown to be 5% for electron temperatures from 1 to 50 MeV. We study bremsstrahlung generated in solid target interaction showing an electron temperature of 0.56 ± 0.04 MeV for a 700 μm Ti titanium target and 0.53 ± 0.03 MeV for a 50 μm target. We investigate bremsstrahlung from a target irradiated by laser-wakefield accelerated electrons showing an endpoint energy of 551 ± 5 MeV, inverse Compton generated x rays with a peak energy of 1.1 MeV, and calibrated radioactive sources. The total energy range covered by all these sources ranges from 10 keV to 551 MeV.
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Affiliation(s)
- A Laso Garcia
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - A Hannasch
- Department of Physics, The University of Texas at Austin, Austin, Texas 78712-1081, USA
| | - M Molodtsova
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - A Ferrari
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - J P Couperus Cadabağ
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - M C Downer
- Department of Physics, The University of Texas at Austin, Austin, Texas 78712-1081, USA
| | - A Irman
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - S D Kraft
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - J Metzkes-Ng
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - L Naumann
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - I Prencipe
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - U Schramm
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - K Zeil
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - R Zgadzaj
- Department of Physics, The University of Texas at Austin, Austin, Texas 78712-1081, USA
| | - T Ziegler
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - T E Cowan
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
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4
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Armstrong CD, Neely D, Kumar D, McKenna P, Gray RJ, Pirozhkov AS. Deconvolution of multi-Boltzmann x-ray distribution from linear absorption spectrometer via analytical parameter reduction. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:113102. [PMID: 34852528 DOI: 10.1063/5.0057486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 10/18/2021] [Indexed: 06/13/2023]
Abstract
Accurate characterization of incident radiation is a fundamental challenge for diagnostic design. Herein, we present an efficient spectral analysis routine that is able to characterize multiple components within the spectral emission by analytically reducing the number of parameters. The technique is presented alongside the design of a hard x-ray linear absorption spectrometer using the example of multiple Boltzmann-like spectral distributions; however, it is generally applicable to all absorption based spectrometer designs and can be adapted to any incident spectral shape. This routine is demonstrated to be tolerable to experimental noise and suitable for real-time data processing at multi-Hz repetition rates.
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Affiliation(s)
- C D Armstrong
- Central Laser Facility, Rutherford Appleton Laboratory, Harwell OX110QX, United Kingdom
| | - D Neely
- Central Laser Facility, Rutherford Appleton Laboratory, Harwell OX110QX, United Kingdom
| | - D Kumar
- Department of Radiation and Chemical Physics, Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 18221 Prague 8, Czechia
| | - P McKenna
- SUPA Department of Physics, University of Strathclyde, Glasgow G4 0NG, United Kingdom
| | - R J Gray
- SUPA Department of Physics, University of Strathclyde, Glasgow G4 0NG, United Kingdom
| | - A S Pirozhkov
- Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215, Japan
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5
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Hannasch A, Laso Garcia A, LaBerge M, Zgadzaj R, Köhler A, Couperus Cabadağ JP, Zarini O, Kurz T, Ferrari A, Molodtsova M, Naumann L, Cowan TE, Schramm U, Irman A, Downer MC. Compact spectroscopy of keV to MeV X-rays from a laser wakefield accelerator. Sci Rep 2021; 11:14368. [PMID: 34257331 PMCID: PMC8277848 DOI: 10.1038/s41598-021-93689-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 06/22/2021] [Indexed: 11/24/2022] Open
Abstract
We reconstruct spectra of secondary X-rays from a tunable 250-350 MeV laser wakefield electron accelerator from single-shot X-ray depth-energy measurements in a compact (7.5 × 7.5 × 15 cm), modular X-ray calorimeter made of alternating layers of absorbing materials and imaging plates. X-rays range from few-keV betatron to few-MeV inverse Compton to > 100 MeV bremsstrahlung emission, and are characterized both individually and in mixtures. Geant4 simulations of energy deposition of single-energy X-rays in the stack generate an energy-vs-depth response matrix for a given stack configuration. An iterative reconstruction algorithm based on analytic models of betatron, inverse Compton and bremsstrahlung photon energy distributions then unfolds X-ray spectra, typically within a minute. We discuss uncertainties, limitations and extensions of both measurement and reconstruction methods.
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Affiliation(s)
- A Hannasch
- Department of Physics, The University of Texas at Austin, Austin, TX, 78712-1081, USA
| | - A Laso Garcia
- The Helmholtz-Zentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328, Dresden, Germany
| | - M LaBerge
- Department of Physics, The University of Texas at Austin, Austin, TX, 78712-1081, USA
- The Helmholtz-Zentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328, Dresden, Germany
| | - R Zgadzaj
- Department of Physics, The University of Texas at Austin, Austin, TX, 78712-1081, USA
| | - A Köhler
- The Helmholtz-Zentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328, Dresden, Germany
| | - J P Couperus Cabadağ
- The Helmholtz-Zentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328, Dresden, Germany
| | - O Zarini
- The Helmholtz-Zentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328, Dresden, Germany
| | - T Kurz
- The Helmholtz-Zentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - A Ferrari
- The Helmholtz-Zentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328, Dresden, Germany
| | - M Molodtsova
- The Helmholtz-Zentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - L Naumann
- The Helmholtz-Zentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328, Dresden, Germany
| | - T E Cowan
- The Helmholtz-Zentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - U Schramm
- The Helmholtz-Zentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328, Dresden, Germany
- Technische Universität Dresden, 01069, Dresden, Germany
| | - A Irman
- The Helmholtz-Zentrum Dresden-Rossendorf, Institute for Radiation Physics, 01328, Dresden, Germany
| | - M C Downer
- Department of Physics, The University of Texas at Austin, Austin, TX, 78712-1081, USA.
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6
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Conceptual Design of a High-flux Multi-GeV Gamma-ray Spectrometer. Sci Rep 2020; 10:9894. [PMID: 32555398 PMCID: PMC7303163 DOI: 10.1038/s41598-020-66832-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 05/28/2020] [Indexed: 11/09/2022] Open
Abstract
We present here a novel scheme for the high-resolution spectrometry of high-flux gamma-ray beams with energies per photon in the multi-GeV range. The spectrometer relies on the conversion of the gamma-ray photons into electron-positron pairs in a solid foil with high atomic number. The measured electron and positron spectra are then used to reconstruct the spectrum of the gamma-ray beam. The performance of the spectrometer has been numerically tested against the predicted photon spectra expected from non-linear Compton scattering in the proposed LUXE experiment, showing high fidelity in identifying distinctive features such as Compton edges and non-linearities.
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