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Self-fields in an Ion-channel Free-electron Laser

Published online by Cambridge University Press:  10 May 2005

MAHDI ESMAEILZADEH ,
JOSEPH E. WILLETT  and
LORI JO WILLETT
MAHDI ESMAEILZADEH
Affiliation:
Department of Physics, Iran University of Science and Technology, Tehran, Iran
JOSEPH E. WILLETT
Affiliation:
Department of Physics and Astronomy, University of Missouri-Columbia, Columbia, MO 65211, USA (willettje@missouri.edu)
LORI JO WILLETT
Affiliation:
Department of Mathematics, University of New Orleans, New Orleans, LA 70148, USA
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Abstract

A theory of self-fields in a free-electron laser with a helical wiggler and ion-channel guiding is presented. The effects of self-electric and magnetic fields on electron trajectories are investigated. It is shown that, under the Budker condition, there is one group of orbits (group I) for which the wiggler-induced self-magnetic field is negative and acts as a diamagnetic correction to the wiggler magnetic field. The function $\Phi $ that determines the rate of change of axial velocity with energy in the presence of the self-fields is derived and studied numerically.

Type
Papers
Information
Journal of Plasma Physics , Volume 71 , Issue 3 , June 2005 , pp. 367 - 376
Copyright
2005 Cambridge University Press

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