scholarly journals SIMPLEX: simulator and postprocessor for free-electron laser experiments

2015 ◽  
Vol 22 (5) ◽  
pp. 1319-1326 ◽  
Author(s):  
Takashi Tanaka
Keyword(s):  
Electron Beam ◽  
Computer Program ◽  
Free Electron ◽  
Free Electron Laser ◽  
Numerical Implementation ◽  
Free Electron Lasers ◽  
Practical Applications ◽  
Amplification Process ◽  
Simulation Results ◽  
Laser Experiments

SIMPLEXis a computer program developed for simulating the amplification process of free-electron lasers (FELs). It numerically solves the so-called FEL equations describing the evolution of the radiation field and growth of microbunching while the electron beam travels along the undulator. In order to reduce the numerical cost, the FEL equations have been reduced to more convenient forms for numerical implementation by applying reasonable approximations.SIMPLEXis equipped with a postprocessor to facilitate the retrieval of desired information from the simulation results, which is crucial for practical applications such as designing the beamline and analyzing the experimental results.

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.

scholarly journals Two-color operation of a free-electron laser with a tilted beam

2016 ◽  
Vol 23 (4) ◽  
pp. 869-873 ◽  
Author(s):  
Sven Reiche ◽  
Eduard Prat
Keyword(s):  
Electron Beam ◽  
Photon Energy ◽  
Free Electron ◽  
Free Electron Laser ◽  
Tuning Range ◽  
Free Electron Lasers ◽  
Successful Operation ◽  
X Ray ◽  
Two Photon ◽  
Gap Control

With the successful operation of free-electron lasers (FELs) as user facilities there has been a growing demand for experiments with two photon pulses with variable photon energy and time separation. A configuration of an undulator with variable-gap control and a delaying chicane in the middle of the beamline is proposed. An injected electron beam with a transverse tilt will only yield FEL radiation for the parts which are close to the undulator axis. This allows, after re-aligning and delaying the electron beam, a different part of the bunch to be used to produce a second FEL pulse. This method offers independent control in photon energy and delay. For the parameters of the soft X-ray beamline Athos at the SwissFEL facility the photon energy tuning range is a factor of five with an adjustable delay between the two pulses from −50 to 950 fs.

Three-dimensional and nonlinear analysis of efficiency enhancement in the E × B drifting electron laser with a prebunched electron beam and a planar wiggler

2013 ◽  
Vol 79 (5) ◽  
pp. 739-749 ◽  
Author(s):  
B. MARAGHECHI ◽  
M. JOKAR ◽  
F. JAFARI BAHMAN ◽  
A. NAEIMABADI
Keyword(s):  
Electron Beam ◽  
Nonlinear Analysis ◽  
Free Electron ◽  
Free Electron Laser ◽  
Three Dimensional ◽  
Three Dimensions ◽  
Efficiency Enhancement ◽  
Nonlinear Simulation ◽  
Simulation Results

AbstractA nonlinear simulation of the E × B drifting electron laser (DEL) and the free-electron laser (FEL), in three dimensions, is presented for a prebunched electron beam to study efficiency enhancement. For the planar wiggler with flat pole faces, prebunching considerably shortens the saturation length, which favors the DEL compared to the FEL. Operation of the DEL with the planar wiggler with parabolic pole faces was not found to be possible due to the modulation of the E × B drift by the wiggler. However, simulation results of the FEL with this type of wiggler are reported.

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
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