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Proceedings Paper

Ion-channel effects on electron orbits and gain in a quadrupole wiggler
Author(s): Mahdi Esmaeilzadeh; Golshad Kheiri
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Paper Abstract

A theoretical study of electron trajectories and gain in a quadrupole wiggler free-electron laser (FEL) with ion-channel guiding is presented. The relativistic equation of motion for a single electron in the combined quadrupole magnetic and ion-channel electrostatic fields is solved for the steady-state electron velocity components. Next the electromagnetic radiation copropagating with the electron beam in the FEL interaction region is analyzed and an equation for gain in the low-gain-per-pass limit is then derived. The results of a numerical study of electron trajectories and gain in the presence of the ion-channel guiding is presented and discussed. It is shown that all orbits of group I are unstable, while group II have stable orbits as well as unstable orbits. Effects of ion-channel guiding on the gain are then investigated and shown that gain enhancement is obtained due to the ion-channel guiding.

Paper Details

Date Published: 6 February 2008
PDF: 9 pages
Proc. SPIE 6823, High-Power Lasers and Applications IV, 68230R (6 February 2008); doi: 10.1117/12.757899
Show Author Affiliations
Mahdi Esmaeilzadeh, Iran Univ. of Science and Technology (Iran)
Golshad Kheiri, Iran Univ. of Science and Technology (Iran)

Published in SPIE Proceedings Vol. 6823:
High-Power Lasers and Applications IV
Dianyuan Fan; Robert F. Walter, Editor(s)

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