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Title:
Effect of beam pre-bunching on gain and efficiency in a surface wave-pumped free electron laser
Authors:
Sharma, Suresh C.; Sharma, Jyotsna; Bhasin, Anuradha; Walia, Ritu; Walia
Affiliation:
AA(Department of Physics, Maharaja Agrasen Institute of Technology, PSP Area Plot No. 1, Sector-22, Rohini, Delhi-110085, India ()), AB(Department of Physics, Maharaja Agrasen Institute of Technology, PSP Area Plot No. 1, Sector-22, Rohini, Delhi-110085, India ()), AC(Department of Electronics and Communications, Northern India Engineering College, New Delhi, India), AD(Department of Physics, Maharaja Agrasen Institute of Technology, PSP Area Plot No. 1, Sector-22, Rohini, Delhi-110085, India ()), AE()
Publication:
Journal of Plasma Physics, Volume 78, Issue 6, pp. 635-640
Publication Date:
12/2012
Origin:
CUP
Abstract Copyright:
(c) 2012: Copyright © Cambridge University Press 2012
DOI:
10.1017/S0022377812000487
Bibliographic Code:
2012JPlPh..78..635S

Abstract

A pre-bunched relativistic electron beam (REB) counter-propagating to the surface wave in the vacuum region Compton backscatters the surface wave into a high-frequency coherent radiation. Plasma supports the surface wave that acquires a large wave number k 0 z around pump wave frequency $\omega _0 = {{\omega _p } {/ {\vphantom {{\omega _p } {\sqrt 2 }}} \kern-\nulldelimiterspace} {\sqrt 2 }}$ , where omega p is the plasma frequency. 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, efficiency, and gain were evaluated based on experimentally known parameters relevant to free electron laser (FEL). It was found that the growth rate, efficiency, and gain of the surface wave-pumped FEL increase with the modulation index Delta, which has the maximum value when approaching unity in addition to when the frequency and wave number of the pre-bunched beam are comparable to that of the radiation wave, i.e., omega01 ~ omega1 and k 01 ~ k 1. The growth rate of FEL instability scales as one-third power of beam density in the Compton regime.
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