scholarly journals Efficiency Enhancement in a Tapered Free Electron Laser by Varying the Electron Beam Radius

2012 ◽  
Author(s):  
Yi Jiao ◽  
J. Wu ◽  
Y. Cai ◽  
A.W. Chao ◽  
W.M. Fawley ◽  
...  
Keyword(s):  
Electron Beam ◽  
Free Electron ◽  
Free Electron Laser ◽  
Beam Radius ◽  
Efficiency Enhancement

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 Compton and Raman free electron laser stability properties for a cold electron beam propagating through a helical magnetic wiggler

1985 ◽  
Vol 33 (3) ◽  
pp. 387-423 ◽  
Author(s):  
John A. Davies ◽  
Ronald C. Davidson ◽  
George L. Johnston
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Dispersion Relation ◽  
Free Electron ◽  
Free Electron Laser ◽  
Relativistic Electron Beam ◽  
Cold Electron ◽  
Wiggler Magnetic Field ◽  
Laser Stability

This paper gives an extensive characterization of the range of validity of the Compton and Raman approximations to the exact free electron laser dispersion relation for a cold, relativistic electron beam propagating through a constantamplitude helical wiggler magnetic field. The electron beam is treated as infinite in transverse extent. Specific properties of the exact and approximate dispersion relations are investigated analytically and numerically. In particular, a detailed numerical analysis is carried out to determine the range of validity of the Compton approximation.

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