Measured performance of the free electron lasers and electron beam in the compact storage ring NIJI-IV

2004 ◽  
Author(s):  
N. Sei ◽  
K. Yamada ◽  
H. Ogawa ◽  
M. Yasumoto ◽  
T. Mikado ◽  
...  
Keyword(s):  
Electron Beam ◽  
Storage Ring ◽  
Free Electron ◽  
Free Electron Lasers

scholarly journals Electron-bunch lengthening on higher-harmonic oscillations in storage-ring free-electron lasers

2017 ◽  
Vol 24 (5) ◽  
pp. 912-918 ◽  
Author(s):  
Norihiro Sei ◽  
Hiroshi Ogawa ◽  
Shuichi Okuda
Keyword(s):  
Electron Beam ◽  
Storage Ring ◽  
Free Electron ◽  
Free Electron Laser ◽  
Cavity Length ◽  
Extreme Ultraviolet ◽  
Bunch Length ◽  
Free Electron Lasers ◽  
X Ray ◽  
Higher Harmonic

The influence of higher-harmonic free-electron laser (FEL) oscillations on an electron beam have been studied by measuring its bunch length at the NIJI-IV storage ring. The bunch length and the lifetime of the electron beam were measured, and were observed to have become longer owing to harmonic lasing, which is in accord with the increase of the FEL gain. It was demonstrated that the saturated FEL power could be described by the theory of bunch heating, even for the harmonic lasing. Cavity-length detuning curves were measured for the harmonic lasing, and it was found that the width of the detuning curve was proportional to a parameter that depended on the bunch length. These experimental results will be useful for developing compact resonator-type FELs by using higher harmonics in the extreme-ultraviolet and the X-ray regions.

Observation of the electron beam and free electron lasers in the compact storage ring NIJI-IV

2003 ◽  
pp. II-39-II-40
Author(s):  
N Sei ◽  
K. Yamada ◽  
M. Yasumoto ◽  
H. Ogawa ◽  
T. Mikado
Keyword(s):  
Electron Beam ◽  
Storage Ring ◽  
Free Electron ◽  
Free Electron Lasers

scholarly journals Physics of Superpulses in Storage Ring Free-Electron Lasers

2008 ◽  
Vol 2008 ◽  
pp. 1-5
Author(s):  
Vladimir N. Litvinenko
Keyword(s):  
Electron Beam ◽  
Phase Space ◽  
Harmonic Generation ◽  
Storage Ring ◽  
Free Electron ◽  
Power Level ◽  
Free Electron Lasers ◽  
Nonlinear Processes ◽  
Lasing Power

Contradictory to the widespread perception, storage ring free-electron lasers with substantial net gain can generate peak lasing power reaching GW levels in the so-called superpulse mode. This power level is sufficient for studies of nonlinear processes and efficient intracavity harmonic generation. This letter describes the physics of the superpulses and a phase-space refreshment in the electron beam responsible for this phenomenon.

scholarly journals Delay-detune scan for longitudinal electron beam characterization at free-electron lasers

2020 ◽  
Vol 23 (12) ◽  
Author(s):  
Svitozar Serkez ◽  
Gianluca Geloni ◽  
Marc Guetg ◽  
Vitali Kocharyan ◽  
Shan Liu ◽  
...  
Keyword(s):  
Electron Beam ◽  
Free Electron ◽  
Free Electron Lasers ◽  
Beam Characterization

Accelerator-based X-ray sources: synchrotron radiation, X-ray free electron lasers and beyond

2019 ◽  
Vol 377 (2147) ◽  
pp. 20180231 ◽  
Author(s):  
Tetsuya Ishikawa
Keyword(s):  
Synchrotron Radiation ◽  
Storage Ring ◽  
Free Electron ◽  
Continuous Wave ◽  
Transitional Period ◽  
Light Sources ◽  
X Rays ◽  
Free Electron Lasers ◽  
Beam Emittance ◽  
X Ray

The evolution of synchrotron radiation (SR) sources and related sciences is discussed to explain the ‘generation’ of the SR sources. Most of the contemporary SR sources belong to the third generation, where the storage rings are optimized for the use of undulator radiation. The undulator development allowed to reduction of the electron energy of the storage ring necessary for delivering 10 keV X-rays from the initial 6–8 GeV to the current 3 Gev. Now is the transitional period from the double-bend-achromat lattice-based storage ring to the multi-bend-achromat lattice to achieve much smaller electron beam emittance. Free electron lasers are the other important accelerator-based light sources which recently reached hard X-ray regime by using self-amplified spontaneous emission scheme. Future accelerator-based X-ray sources should be continuous wave X-ray free electron lasers and pulsed X-ray free electron lasers. Some pathways to reach the future case are discussed. This article is part of the theme issue ‘Fifty years of synchrotron science: achievements and opportunities’.

Evaluation of Synchrotron Damping Time with Storage Ring Free Electron Lasers

2008 ◽  
Vol 77 (7) ◽  
pp. 074501 ◽  
Author(s):  
Norihiro Sei ◽  
Kawakatsu Yamada ◽  
Hiroshi Ogawa
Keyword(s):  
Storage Ring ◽  
Free Electron ◽  
Free Electron Lasers
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