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Gain calculation of a free-electron laser operating with a non-uniform ion-channel guide |
A. Hasanbeigia)†, H. Mehdiana), and S. Jafarib) |
a Department of Physics and Plasma Research Institute of Tarbiat Moallem University, 49 Dr Mofatteh Avenue, Tehran 15614, Iran; b Department of Physics, University of Guilan, Rasht 41335-1914, Iran |
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Abstract Amplification of an electromagnetic wave by a free electron laser (FEL) with a helical wiggler and an ion channel with a periodically varying ion density is examined. The relativistic equation of motion for a single electron in the combined wiggler and the periodic ion-channel fields is solved and the classes of possible trajectories in this configuration are discussed. The gain equation for the FEL in the low-gain-per-pass limit is obtained by adding the effect of the periodic ion channel. Numerical calculation is employed to analyse the gain induced by the effects of the non-uniform ion density. The variation of gain with ion-channel density is demonstrated. It is shown that there is a gain enhancement for group I orbits in the presence of a non-uniform ion-channel but not in a uniform one. It is also shown that periodic ion-channel guiding is used to reach the maximum peak gain in a low ion-channel frequency (low ion density).
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Received: 05 September 2010
Revised: 14 February 2011
Accepted manuscript online:
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PACS:
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41.60.Cr
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(Free-electron lasers)
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52.59.Rz
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(Free-electron devices)
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52.38.-r
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(Laser-plasma interactions)
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Cite this article:
A. Hasanbeigi, H. Mehdian, and S. Jafari Gain calculation of a free-electron laser operating with a non-uniform ion-channel guide 2011 Chin. Phys. B 20 094103
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