Effects of finite radial geometry on free‐electron‐laser instability with a longitudinal wiggler field
作者:
G. Mishra,
V. K. Tripathi,
期刊:
Journal of Applied Physics
(AIP Available online 1990)
卷期:
Volume 67,
issue 10
页码: 6056-6060
ISSN:0021-8979
年代: 1990
DOI:10.1063/1.345216
出版商: AIP
数据来源: AIP
摘要:
The theory of free‐electron‐laser instability for a tenuous relativistic electron beam propagating parallel to a longitudinal wiggler field has been extended to include the influence of finite radial geometry on its stability properties. The growth rate of the instability shows a sensitive dependence on (&ngr;/&ggr;)1/3, where &ngr; is the Budker parameter and &ggr; is the beam energy. The growth rate increases with increasing beam intensity. However, the instability bandwidth with respect to the beam location inside the waveguide decreases for beams with somewhat higher &ngr;/&ggr; values. The instability is broadband for several harmonics excited.
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