Improve growth rate of Smith–Purcell free-electron laser by Bragg reflector

2011 ◽  
Vol 98 (21) ◽  
pp. 211503 ◽  
Author(s):  
Z. Yang ◽  
Y. Tsunawaki ◽  
M. R. Asakawa ◽  
M. Hangyo ◽  
S. Miyamoto ◽  
...  
Keyword(s):  
Growth Rate ◽  
Free Electron ◽  
Free Electron Laser ◽  
Bragg Reflector

Numerical investigations on the effects of geometrical parameters on free electron laser instability

2008 ◽  
Vol 74 (6) ◽  
pp. 741-747
Author(s):  
B. S. SHARMA ◽  
N. K. JAIMAN
Keyword(s):  
Growth Rate ◽  
Electron Beam ◽  
Free Electron ◽  
Free Electron Laser ◽  
Instability Growth Rate ◽  
Magnetized Plasma ◽  
Geometrical Parameters ◽  
Uniform Density ◽  
Backward Wave Oscillator ◽  
Instability Growth

AbstractIn this paper we numerically investigate the effects of various geometrical parameters of a backward wave oscillator (BWO), filled with a magnetized plasma of uniform density and driven by a mild relativistic solid electron beam, on the instability growth rate (Γ) of a free electron laser (FEL). The FEL instability is numerically calculated and the result is compared with the instability growth rate of an annular electron beam for the same set of parameters. The instability growth for a solid electron beam scales inversely to the seventh power of relativistic gamma factor γ0 and directly proportional to the corrugation amplitude.

A local theory of effect of beam pre-modulation on gain and efficiency in a surface wave pumped free electron laser

2014 ◽  
Vol 32 ◽  
pp. 1460351
Author(s):  
Jyotsna Sharma ◽  
Suresh C. Sharma ◽  
Anuradha Bhasin ◽  
V. K. Jain
Keyword(s):  
Growth Rate ◽  
Surface Wave ◽  
Free Electron ◽  
High Frequency ◽  
Free Electron Laser ◽  
Millimeter Waves ◽  
Local Theory ◽  
Vacuum Region ◽  
Laser Instability ◽  
Frequency Radiation

A pre-modulated relativistic electron beam (REB) counter propagating to the surface wave in the vacuum region Compton backscatters the surface wave into a high frequency radiation. The surface wave extends into the vacuum region and can be employed as a wiggler for the generation of sub-millimeter waves. The growth rate and gain were evaluated for a typical FEL (Free Electron Laser) parameters and It is found that the growth rate and gain of the surface wave pumped free electron laser increases with the modulation index. Moreover, the growth rate of the FEL (Free electron Laser) instability scales as one-third power of the beam density in the Compton regime.

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