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Comparison of self-fields effects in two-stream electromagnetically pumped FEL with ion-channel guiding and axial magnetic field

Published online by Cambridge University Press:  27 May 2011

S. SAVIZ ,
H. MEHDIAN ,
FARZIN M. AGHAMIR ,
M. GHORANNEVIS  and
A. A. ASHKARRAN
S. SAVIZ
Affiliation:
Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.
H. MEHDIAN
Affiliation:
Department of Physics and Institute for Plasma Research, Tarbiat Moallem University, 49, Dr Mofatteh avenue, Tehran 15614, Iran.
FARZIN M. AGHAMIR
Affiliation:
Department of Physics, University of Tehran, N. Kargar Ave, Tehran 14399, Iran.
M. GHORANNEVIS
Affiliation:
Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.
A. A. ASHKARRAN
Affiliation:
Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.
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Abstract

A theory of two-stream free-electron laser in a combined electromagnetic wiggler and an ion-channel guiding is developed. In the analysis, the electron trajectories and the small signal gain are derived by considering the effects of self-fields. Numerical calculations show that there are seven group's trajectories rather than nine groups reported in Mehdian and Saviz (2010 Chin. Phys. B 19(1), 014214). The comparison of the normalized gains and their corresponding normalized frequencies by employing the axial magnetic field and ion-channel guiding, with and without self-fields, in FEL has been studied numerically. The results show that the normalized maximum gain in FEL with axial magnetic is larger than that for using ion-channel guiding except in small region, but the results for their corresponding normalized frequencies are opposite.

Type
Papers
Information
Journal of Plasma Physics , Volume 77 , Issue 6 , December 2011 , pp. 765 - 776
Copyright
Copyright © Cambridge University Press 2011

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