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A comparison between electron orbits for both an axial magnetic field and an ion-channel guiding in a FEL with an electromagnetic wave wiggler

Published online by Cambridge University Press:  01 April 2008

H. MEHDIAN  and
S. JAFARI
H. MEHDIAN
Affiliation:
Department of Physics and Institute for Plasma Research, Tarbiat Moalem University, 49 Dr Mofatteh Avenue, Tehran 15614, Iran (Mehdian@saba.tmu.ac.ir; S_Jafari@tmu.ac.ir)
S. JAFARI
Affiliation:
Department of Physics and Institute for Plasma Research, Tarbiat Moalem University, 49 Dr Mofatteh Avenue, Tehran 15614, Iran (Mehdian@saba.tmu.ac.ir; S_Jafari@tmu.ac.ir)
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Abstract

The operation of a free-electron laser (FEL) with electromagnetic wave wiggler in the presence of an ion-channel guiding as well as an axial guide magnetic field is considered and compared. Theoretical studies of electron trajectories and dispersion relations in a combined ion electrostatic field as well as large-amplitude backward-propagating electromagnetic waves are analyzed. The large-amplitude wave acts like a magnetostatic wiggler in a FEL. The results of a numerical study are presented and discussed. It is shown that in the wiggler pumped ion-channel free-electron laser (WPIC-FEL), electron orbits and dispersion relation are time-dependent, and over time, electron orbits while oscillating bear a periodic motion.

Type
Papers
Information
Journal of Plasma Physics , Volume 74 , Issue 2 , April 2008 , pp. 187 - 196
Copyright
Copyright © Cambridge University Press 2007

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