Three-dimensional nonlinear efficiency enhancement analysis in free-electron laser amplifier with prebunched electron beam and ion-channel guiding

2013 ◽  
Vol 20 (2) ◽  
pp. 023101 ◽  
Author(s):  
F. Jafari Bahman ◽  
B. Maraghechi
Keyword(s):  
Electron Beam ◽  
Ion Channel ◽  
Free Electron ◽  
Free Electron Laser ◽  
Three Dimensional ◽  
Efficiency Enhancement ◽  
Laser Amplifier

Comparative study of electron motion and stability for different focusing regimes in a free-electron laser with three-dimensional helical wiggler

2015 ◽  
Vol 81 (5) ◽  
Author(s):  
Jing-Yue Xu ◽  
S.-J. Wang ◽  
Y.-G. Xu ◽  
Y.-P. Ji ◽  
X.-X. Liu ◽  
...  
Keyword(s):  
Electron Beam ◽  
Ion Channel ◽  
Free Electron ◽  
Free Electron Laser ◽  
Three Dimensional ◽  
Larmor Radius ◽  
Electron Motion ◽  
Magnetic Focusing ◽  
Laser Wave ◽  
The Stability

Since the electromagnetic energy gained by the laser wave in a free-electron laser (FEL) is transferred from the kinetic energy loss of a relativistic electron beam, the stability of electron motion is one of the key factors that affect FEL performance. In this paper the stability of electron motion is compared for different focusing regimes. It is demonstrated that the natural focusing regime of a three-dimensional wiggler is easily broken by the self-field of the electron beam. The magnetic focusing regime of an axial guide magnetic field is based on the superposition of a strong Larmor rotation on the transverse quiver motion of the electrons, while the electric focusing regime of an ion-channel guiding field generates an electric force to counteract the divergent effect of the beam self-field. In comparison with the magnetic focusing regime of an external magnetic system, the electric focusing regime of an ion-channel guiding field may yield smaller instantaneous Larmor radius and slighter Larmor-centre deviation from the axis and provide better motion stability.

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 Compensation of thermal loss in free-electron laser with optimal tapering and pre-bunching

2020 ◽  
Vol 38 (2) ◽  
pp. 141-147
Author(s):  
F. Bazouband
Keyword(s):  
Electron Beam ◽  
Free Electron ◽  
Free Electron Laser ◽  
Nonlinear Differential Equations ◽  
Three Dimensional ◽  
Energy Spread ◽  
Thermal Electron ◽  
Simulation Code ◽  
Runge Kutta Method ◽  
Saturation Power

AbstractIncreasing the output power of a long-wavelength free-electron laser (FEL), despite the destroying effects of beam energy spread, is studied using the optimal pre-bunching of the thermal electron beam along with the optimal tapering of the planar wiggler magnetic field. A set of self-consistent coupled nonlinear differential equations in three dimensional that describe the evolution of radiation and electron beam in the interaction zone are solved numerically by the Runge–Kutta method. The axial energy spread is considered and it degrades the FEL performance by reducing the saturation power and increasing the saturation length. To compensate these destroying effects, the optimum function or degree of electron beam pre-bunching and optimum parameters of wiggler tapering are found by the successive runs of the simulation code.

Relativistic Raman backscattering in an electron beam with ion-channel guiding and its application in free-electron laser

2005 ◽  
Vol 12 (11) ◽  
pp. 113106 ◽  
Author(s):  
A. A. Kordbacheh ◽  
B. Maraghechi ◽  
B. Farokhi ◽  
J. E. Willett
Keyword(s):  
Electron Beam ◽  
Ion Channel ◽  
Free Electron ◽  
Free Electron Laser
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