| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Effects of self-fields on gain in two-stream free electron laser with helical wiggler and an axial guiding magnetic field |
| Saviz Sa, Lashani Ea, Ashkarran Ab |
a Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, P. O. Box 14665-678, Iran;
b Department of Physics, Faculty of Basic Sciences, University of Mazandaran, Babolsar, Iran |
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Abstract The theory for the two-stream free electron laser (FEL) consisting of a relativistic electron beam transporting along the axis of a helical wiggler in the presence of an axial guiding magnetic field is proposed and investigated. In the analysis, the effects of self-fields are taken into account. The electron trajectories and the small signal gain are derived. The characteristics of the linear-gain and the normalized maximum gain are studied numerically. The results show that there are seven stable groups of orbits in the presence of self-fields instead of two groups reported in the absence of the self-fields. It is also shown that the normalized gains of three groups decrease while the rest increase with the increasing of normalized cyclotron frequency Ω0. Furthermore, it is found that the two-stream instability and the self-field lead to a decrease in the maximum gain except for group 3. The results show that the normalized maximum gain is enhanced in comparison with that of the single stream.
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Received: 24 March 2013
Revised: 15 May 2013
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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Corresponding Authors:
Saviz S
E-mail: Shahrooz.saviz@srbiau.ac.ir
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| About author: 41.60.Cr |
Cite this article:
Saviz S, Lashani E, Ashkarran A Effects of self-fields on gain in two-stream free electron laser with helical wiggler and an axial guiding magnetic field 2014 Chin. Phys. B 23 024102
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