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Chin. Phys. B, 2010, Vol. 19(1): 014214    DOI: 10.1088/1674-1056/19/1/014214
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The effects of self-fields on the electron trajectory and gain in a two-stream electromagnetically pumped free-electronlaser with axial guiding field

H. Mehdiana)† and S. Savizb)
a Department of Physics and Institute for Plasma Research, Tarbiat Moallem University, 49, Dr. Mofatteh avenue, Tehran 15614, Iran; b Plasma Physics Research Center, Science and Research Campus, Islamic Azad University, Tehran, P.O. Box: 14665-678, Iran
Abstract  A theory of a two-stream free-electron laser in a combined electromagnetic wiggler (EMW) is developed, in which we use an axial-guide magnetic field and take into account the effects of the self-fields. The electron trajectories and the small signal gain are derived. The stability of the trajectories, the characteristics of the linear-gain, and the normalised maximum gain are studied numerically. The results show that there are nine stable groups of orbits in the presence of self-fields instead of seven groups reported in the absence of the self-field. It is also shown that the normalised gains of four groups of the orbits are decreasing and those for the rest of them are increasing with growing $\bar{\varOmega}_0$. Furthermore, it is found that the two-stream laser with self-field enhances the maximum gain in comparison with the single stream case.
Keywords:  free electron laser      two-stream  
Received:  12 January 2009      Revised:  14 July 2009      Accepted manuscript online: 
PACS:  41.60.Cr (Free-electron lasers)  
  42.55.Ah (General laser theory)  

Cite this article: 

H. Mehdian and S. Saviz The effects of self-fields on the electron trajectory and gain in a two-stream electromagnetically pumped free-electronlaser with axial guiding field 2010 Chin. Phys. B 19 014214

[1] Roberson C W and Sprangle P 1980 Phys. Fluids B 1 3
[2] Jaber I and Demokan O 1996 Phys. Plasmas 3 4190
[3] Wang L and Kevorkian J 1996 Phys. Plasmas 3 1162
[4] Seo Y and Park I H 1997 Phys. Plasmas 4 4176
[5] McNeil B W J, Robb G R and Poole M W 2004 Phys. Rev. E 70 035501(R) 03550-1
[6] Bekefi G and Jacobs K D 1982 J. Appl. Phys. 53 4113
[7] Wilhelmsson H 1991 Physica Scripta 44 603
[8] Mehdian H, Saviz S and Hasanbeigi A 2008 Phys. Plasmas 15 043103 043103-1
[9] Mehdian H and Saviz S 2008 Phys. Plasmas 15 093103 093103-1
[10] Botton M and Ron A 1990 J. Appl. Phys. 67 6583
[11] Freund H P, Kehs R A and Granatstein V L 1986 Phys. Rev. A 34 2007
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