1
|
Peak Shift of Coherent Edge Radiation Spectrum Depending on Radio Frequency Field Phase of Accelerator. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12020626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Spectra of coherent edge radiation (CER) were observed at the S-band linac facility of Kyoto University Free Electron Laser. A local maximum was observed in the CER spectrum on-crest operation of the radio frequency (RF) field. As the phase of the RF field was shifted from the crest, the frequency of the maximum decreased, and the CER spectrum approached a spectrum of Gaussian-distributed electrons in a bunch. It was found that this strange spectrum can be explained by a model in which a satellite pulse exists around a main pulse in the electron bunch. Furthermore, it demonstrated that CER is an effective tool for monitoring the shape of the electron bunch.
Collapse
|
2
|
First demonstration of coherent resonant backward diffraction radiation for a quasi-monochromatic terahertz-light source. Sci Rep 2020; 10:7526. [PMID: 32371899 PMCID: PMC7200690 DOI: 10.1038/s41598-020-64426-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2020] [Accepted: 04/15/2020] [Indexed: 12/04/2022] Open
Abstract
We proposed coherent resonant backward diffraction radiation (CRBDR), which generates wavelength-tunable quasi-monochromatic lights using a compact diffractor assembly in an accelerator facility of high-energy electron beams, as a unique intense terahertz (THz) light source. Superimposing the coherent backward diffracted radiation emitted by periodically arranged hollow diffractors, it is possible to amplify the frequency components satisfying a resonant condition, and make the radiation monochromatic. We demonstrated the CRBDR using the L-band linac at the Institute for Integrated Radiation and Nuclear Science at Kyoto University. It was observed that the coherent backward diffraction radiation was amplified more than three times at a frequency which was the fundamental resonant frequency in the CRBDR theory. Moreover, the number of diffractors at the saturation of the radiation power was consistent with the number estimated from the electron distribution in a bunch. The experimental results show that the CRBDR is useful as a quasi-monochromatic light source in the THz band.
Collapse
|
3
|
First demonstration of coherent Cherenkov radiation matched to circular plane wave. Sci Rep 2017; 7:17440. [PMID: 29234106 PMCID: PMC5727164 DOI: 10.1038/s41598-017-17822-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 11/30/2017] [Indexed: 11/11/2022] Open
Abstract
We observed coherent Cherenkov radiation matched to a circular plane wave (CCR-MCP) for the first time using a hollow conical dielectric made of a high-density polyethylene. The refractive index and the absorption coefficient of the dielectric were evaluated to be 1.537 ± 0.004 and 0.006 ± 0.028 by measuring the pulse formed by the interference between the CCR-MCP and the coherent diffraction radiation. These values were consistent with the values shown in a reference for the high-density polyethylene. In accordance with the theory of the Cherenkov radiation, the spectrum of the CCR-MCP shifted towards higher wavenumbers compared to that of the coherent diffraction radiation. The intensity of the CCR-MCP beam was proportional to the height of the hollow conical dielectric and was 3 times the intensity of the coherent diffraction radiation. The CCR-MCP technique can produce broadband terahertz-wave sources with unprecedented power at compact accelerator facilities.
Collapse
|
4
|
Chiadroni E, Bellaveglia M, Calvani P, Castellano M, Catani L, Cianchi A, Di Pirro G, Ferrario M, Gatti G, Limaj O, Lupi S, Marchetti B, Mostacci A, Pace E, Palumbo L, Ronsivalle C, Pompili R, Vaccarezza C. Characterization of the THz radiation source at the Frascati linear accelerator. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:022703. [PMID: 23464185 DOI: 10.1063/1.4790429] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The linac driven coherent THz radiation source at the SPARC-LAB test facility is able to deliver broadband THz pulses with femtosecond shaping. In addition, high peak power, narrow spectral bandwidth THz radiation can be also generated, taking advantage of advanced electron beam manipulation techniques, able to generate an adjustable train of electron bunches with a sub-picosecond length and with sub-picosecond spacing. The paper reports on the manipulation, characterization, and transport of the electron beam in the bending line transporting the beam down to the THz station, where different coherent transition radiation spectra have been measured and studied with the aim to optimize the THz radiation performances.
Collapse
|
5
|
Agladze NI, Klopf JM, Williams GP, Sievers AJ. Terahertz spectroscopy with a holographic Fourier transform spectrometer plus array detector using coherent synchrotron radiation. APPLIED OPTICS 2010; 49:3239-3244. [PMID: 20539339 DOI: 10.1364/ao.49.003239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
By use of coherent terahertz synchrotron radiation, we experimentally tested a holographic Fourier transform spectrometer coupled to an array detector to determine its viability as a spectral device. Somewhat surprisingly, the overall performance strongly depends on the absorptivity of the birefringent lithium tantalate pixels in the array detector.
Collapse
Affiliation(s)
- Nikolay I Agladze
- Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853-2501, USA
| | | | | | | |
Collapse
|
6
|
van Tilborg J, Schroeder CB, Filip CV, Tóth C, Geddes CGR, Fubiani G, Huber R, Kaindl RA, Esarey E, Leemans WP. Temporal characterization of femtosecond laser-plasma-accelerated electron bunches using terahertz radiation. PHYSICAL REVIEW LETTERS 2006; 96:014801. [PMID: 16486463 DOI: 10.1103/physrevlett.96.014801] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2005] [Indexed: 05/06/2023]
Abstract
The temporal profile of relativistic laser-plasma-accelerated electron bunches has been characterized. Coherent transition radiation at THz frequencies, emitted at the plasma-vacuum boundary, was measured through electro-optic sampling. Frequencies up to the crystal detection limit of 4 THz were observed. Comparison between data and theory indicates that THz radiation from bunches with structure shorter than approximately = 50 fs (root-mean-square) is emitted. The measurement demonstrates both shot-to-shot stability of the laser-plasma accelerator and femtosecond synchronization between bunch and probe beam.
Collapse
Affiliation(s)
- J van Tilborg
- Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Schroeder CB, Esarey E, Van Tilborg J, Leemans WP. Theory of coherent transition radiation generated at a plasma-vacuum interface. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2004; 69:016501. [PMID: 14995729 DOI: 10.1103/physreve.69.016501] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2003] [Indexed: 05/24/2023]
Abstract
Transition radiation generated by an electron beam, produced by a laser wakefield accelerator operating in the self-modulated regime, crossing the plasma-vacuum boundary is considered. The angular distributions and spectra are calculated for both the incoherent and the coherent radiation. The effects of the longitudinal and transverse momentum distributions on the differential energy spectra are examined. Diffraction radiation from the finite transverse extent of the plasma is considered and shown to strongly modify the spectra and energy radiated for long-wavelength radiation. This method of transition radiation generation has the capability of producing high peak power terahertz radiation, of order 100 microJ/pulse at the plasma-vacuum interface, which is several orders of magnitude beyond current state-of-the-art terahertz sources.
Collapse
Affiliation(s)
- C B Schroeder
- Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA
| | | | | | | |
Collapse
|
8
|
Baton SD, Santos JJ, Amiranoff F, Popescu H, Gremillet L, Koenig M, Martinolli E, Guilbaud O, Rousseaux C, Rabec Le Gloahec M, Hall T, Batani D, Perelli E, Scianitti F, Cowan TE. Evidence of ultrashort electron bunches in laser-plasma interactions at relativistic intensities. PHYSICAL REVIEW LETTERS 2003; 91:105001. [PMID: 14525484 DOI: 10.1103/physrevlett.91.105001] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2002] [Indexed: 05/24/2023]
Abstract
The second harmonic of the laser light (2omega(0)) is observed on the rear side of thick solid targets irradiated by a laser beam at relativistic intensities. This emission is explained by the acceleration by the laser pulse in front of the target of short bunches of electrons separated by the period (or half the period) of the laser light. When reaching the rear side of the target, these electron bunches emit coherent transition radiation at 2omega(0). The observations indicate that, in our conditions, the minimum fraction of the laser energy transferred to these electron bunches is of the order of 1%.
Collapse
Affiliation(s)
- S D Baton
- Laboratoire pour l'Utilisation des Lasers Intenses, UMR 7605 CNRS-CEA-Ecole Polytechnique-Université Paris VI, Palaiseau, France
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Lumpkin AH, Dejus R, Berg WJ, Borland M, Chae YC, Moog E, Sereno NS, Yang BX. First Observation of z-Dependent Electron-Beam Microbunching Using Coherent Transition Radiation. PHYSICAL REVIEW LETTERS 2001; 86:79-82. [PMID: 11136098 DOI: 10.1103/physrevlett.86.79] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2000] [Indexed: 05/23/2023]
Abstract
We report the first measurements of the electron-beam microbunching z dependence in a self-amplified spontaneous-emission (SASE) free-electron laser (FEL) experiment by the observation of visible wavelength coherent transition radiation (CTR). In this case the fundamental SASE wavelength was at 537 nm, and the CTR exhibited an exponential intensity growth similar to the SASE radiation. In addition, we observed for the first time structure in the CTR angular distribution patterns that may be useful for optimizing SASE FEL performance.
Collapse
Affiliation(s)
- AH Lumpkin
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | | | | | | | | | | | | | | |
Collapse
|
10
|
Takahashi T, Shibata Y, Ishi K, Ikezawa M, Oyamada M, Kondo Y. Observation of coherent cerenkov radiation from a solid dielectric with short bunches of electrons. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 2000; 62:8606-8611. [PMID: 11138160 DOI: 10.1103/physreve.62.8606] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2000] [Indexed: 05/23/2023]
Abstract
Short bunches of 150-MeV electrons of a linear accelerator passed along the surface of a crystal quartz or a teflon and coherent Cerenkov radiation from the solid dielectrics has been observed in the wavelength range from 0.5 to 4 mm. Properties of the radiation have been experimentally investigated. The angular distribution of the observed radiation showed a maximum peak in the direction of the Cerenkov angle with several satellite peaks. The intensity increased linearly with increasing the length of the medium and was proportional to the square of the number of electrons in the bunch. The spectral intensity was enhanced by almost five orders of magnitude in comparison with the theoretical calculation of incoherent radiation.
Collapse
Affiliation(s)
- T Takahashi
- Research Reactor Institute, Kyoto University, Kumatori, Osaka 590-0494, Japan
| | | | | | | | | | | |
Collapse
|
11
|
Potylitsyn AP. Thomson scattering of coherent diffraction radiation by an electron bunch. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1999; 60:2272-9. [PMID: 11970022 DOI: 10.1103/physreve.60.2272] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/1998] [Indexed: 11/07/2022]
Abstract
This paper considers the process of Thomson scattering of coherent diffraction radiation (CDR) produced by the preceding electron bunch in the accelerator onto one of the subsequent bunches. It is shown that the yield of scattered hard photons is proportional to N(3)(e), where N(e) is the number of electrons per bunch. A geometry is chosen for the CDR generation and an expression is obtained for the scattered-photon spectrum, with regard to the geometry used, that depends explicitly on the bunch size. A technique is proposed for measuring the bunch length using scattered radiation characteristics.
Collapse
Affiliation(s)
- A P Potylitsyn
- Tomsk Polytechic University, prospekt Lenina 2A, Tomsk 634050, Russia.
| |
Collapse
|
12
|
Shibata Y, Hasebe S, Ishi K, Takahashi T, Ohsaka T, Ikezawa M, Nakazato T, Oyamada M, Urasawa S, Yamakawa T, Kondo Y. Observation of coherent diffraction radiation from bunched electrons passing through a circular aperture in the millimeter- and submillimeter-wavelength regions. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1995; 52:6787-6794. [PMID: 9964193 DOI: 10.1103/physreve.52.6787] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
13
|
Swartz JC, Guenther BD, Guo W, Jones CR, Kosai H, Dutta JM. Nondestructive diagnostics for relativistic picosecond bunched electron beams. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1995; 52:5416-5424. [PMID: 9964039 DOI: 10.1103/physreve.52.5416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
14
|
Lai R, Sievers AJ. Phase problem associated with the determination of the longitudinal shape of a charged particle bunch from its coherent far-ir spectrum. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1995; 52:4576-4579. [PMID: 9963942 DOI: 10.1103/physreve.52.4576] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
15
|
Lai R, Happek U, Sievers AJ. Measurement of the longitudinal asymmetry of a charged particle bunch from the coherent synchrotron or transition radiation spectrum. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1994; 50:R4294-R4297. [PMID: 9962613 DOI: 10.1103/physreve.50.r4294] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
16
|
Takahashi T, Kanai T, Shibata Y, Ishi K, Ikezawa M, Nakazato T, Oyamada M, Urasawa S, Yamakawa T, Takami K, Matsuyama T, Kobayashi K, Fujita Y. C-caronerenkov radiation from a finite trajectory of electrons. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1994; 50:4041-4050. [PMID: 9962461 DOI: 10.1103/physreve.50.4041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|