Abstract
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.
Highlights
The free electron laser (FEL) is an attractive and high power microwave device in which a relativistic electron beam propagating through a periodic magnetic field is used to amplify or generate coherent radiation of emission[1,2,3,4].This is an Open Access article published by World Scientific Publishing Company
There has been a great deal of interest in studying the free electron laser (FEL) and Cerenkov free electron laser (CFEL)[3,5-15] using pre-bunched electron beams
Sharma and Bhasin[9] have studied the gain and efficiency enhancement in a Cerenkov free electron laser using pre-bunched electron beam in a dielectric loaded waveguide. They have found that the growth rate, efficiency and gain of the
Summary
The free electron laser (FEL) is an attractive and high power microwave device in which a relativistic electron beam propagating through a periodic magnetic field is used to amplify or generate coherent radiation of emission[1,2,3,4] This is an Open Access article published by World Scientific Publishing Company. Ω 0 are the mass of the electrons, electronic charge, speed of light in vacuum, SPW (Surface plasma wave) wave number and frequency, respectively. We perturb this equilibrium by an azimuthally symmetric TM (Transverse mode) mode.
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