scholarly journals Enhanced super-radiance from energy-modulated short electron bunch free-electron lasers

2007 ◽  
Vol 10 (8) ◽  
Author(s):  
Yu. Lurie ◽  
Y. Pinhasi
Keyword(s):  
Free Electron ◽  
Electron Bunch ◽  
Free Electron Lasers

scholarly journals A micro channel-cut crystal X-ray monochromator for a self-seeded hard X-ray free-electron laser

2019 ◽  
Vol 26 (5) ◽  
pp. 1496-1502 ◽  
Author(s):  
Taito Osaka ◽  
Ichiro Inoue ◽  
Ryota Kinjo ◽  
Takashi Hirano ◽  
Yuki Morioka ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Electron Bunch ◽  
Optical Pulse ◽  
Seed Pulse ◽  
Micro Channel ◽  
Free Electron Lasers ◽  
X Ray ◽  
Optical Delay ◽  
Temporal Overlap

A channel-cut Si(111) crystal with a channel width of 90 µm was developed for achieving reflection self-seeding in hard X-ray free-electron lasers (XFELs). With the crystal a monochromatic seed pulse is produced from a broadband XFEL pulse generated in the first undulator section with an optical delay of 119 fs at 10 keV. The small optical delay allows a temporal overlap between the seed optical pulse and the electron bunch by using a small magnetic chicane for the electron beam placed between two undulator sections. Peak reflectivity reached 67%, which is reasonable compared with the theoretical value of 81%. By using this monochromator, a monochromatic seed pulse without broadband background in the spectrum was obtained at SACLA with a conversion efficiency from a broadband XFEL pulse of 2 × 10−2, which is ∼10 times higher than the theoretical efficiency of transmission self-seeding using a thin diamond (400) monochromator.

scholarly journals Generating quasi-single-cycle THz pulse from frequency-chirped electron bunch train and a tapered undulator

2016 ◽  
Vol 4 ◽  
Author(s):  
Zhuoran Ma ◽  
Zhe Wang ◽  
Feichao Fu ◽  
Rui Wang ◽  
Dao Xiang
Keyword(s):  
Laser Pulse ◽  
Predictive Models ◽  
Free Electron ◽  
Pulse Train ◽  
Electron Bunch ◽  
Scaling Laws ◽  
Free Electron Lasers ◽  
Single Cycle ◽  
Rf Gun ◽  
Proof Of Principle

We propose a proof-of-principle experiment to test a new scheme to produce a single-cycle radiation pulse in free-electron lasers (FELs). Here, a few ${\it\alpha}$ -BBO crystals will be first used to produce an equally spaced laser pulse train. Then, the laser pulse train illuminates the cathode to produce a frequency-chirped electron bunch train in a photocathode rf gun. Finally, the frequency-chirped electron bunch train passes through a tapered undulator to produce a quasi-single-cycle THz pulse. This experiment should allow comparison and confirmation of predictive models and scaling laws, and the preliminary experimental results will also be discussed.

TAPERED WIGGLER FREE ELECTRON LASERS DRIVEN BY NON-MONOENERGETIC ELECTRON BEAMS

1983 ◽  
Vol 44 (C1) ◽  
pp. C1-371-C1-371 ◽  
Author(s):  
J. C. Goldstein ◽  
W. B. Colson ◽  
R. W. Warren
Keyword(s):  
Free Electron ◽  
Electron Beams ◽  
Free Electron Lasers ◽  
Monoenergetic Electron

Radiation of Charge Moving Between Two Planar Periodic Wire Structures

2020 ◽  
Vol 23 (1) ◽  
pp. 66-71
Author(s):  
E. A. Gurnevich ◽  
I. V. Moroz
Keyword(s):  
Angular Distribution ◽  
Charged Particle ◽  
Research And Development ◽  
High Power ◽  
Free Electron ◽  
Radiation Intensity ◽  
Free Electron Lasers ◽  
Radiation Sources ◽  
Power Radiation ◽  
High Power Radiation

The Smith-Purcell radiation of a charged particle moving in a periodic structure is analysed theoretically. The considered structure consists of two planar diffraction gratings with different periods which are formed by parallel conducting wires. The analytical expression for the spectral-angular distribution of radiation is obtained. It is shown that the angular distribution of radiation can be made narrower by using two gratings instead of one, and radiation intensity can be manipulated by parallel relative shift of gratings. The obtained results are of great importance for the research and development of high power radiation sources based on volume free-electron lasers.

Summary Discussion: Theoretical Aspects of XUV Free Electron Lasers.

1983 ◽  
Author(s):  
W. B. Colson ◽  
W. Becker ◽  
S. Benson ◽  
A. Bhowmik ◽  
R. Cover
Keyword(s):  
Free Electron ◽  
Free Electron Lasers
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