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Instability of Annular Beam with Finite Thickness in Dielectric-Loaded Cylindrical Waveguide
Instability of Annular Beam with Finite Thickness in Dielectric-Loaded Cylindrical Waveguide
Tamura, Shusuke
37701
Yamakawa, Mitsuhisa
37702
Takashima, Yusuke
37703
Ogura, Kazuo
37704
annular beam
finite thickness
low-frequency surface wave mode
high-frequency surface wave mode
Cherenkov instability
slow cyclotron instability
The cherenkov and slow cyclotron instabilities driven by an axially injected electron beam in a cylindrical waveguide are studied using a new version of the self-consistent linear theory considering three-dimensional beam perturbations. There are three kinds of models for beam instability analysis, which are based on a cylindrical solid beam, an infinitesimally thin annular beam, and a finitely thick annular beam. Among these models, the beam shape properly representing the often used actual annular electron beams is the finitely thick annulus. We develop a numerical code for a cylindrical waveguide with a finitely thick annular beam. Our theory is valid for any beam velocity. We present eigen-modes of the cylindrical system with the plasma and beam. Instabilities driven by the annular beam in a dielectric-loaded waveguide are also examined.
journal article
The Japan Society of Plasma Science and Nuclear Fusion Research
2008
application/pdf
Plasma and Fusion Research
3
S1020-1
S1020-7
Plasma and Fusion Research
AA12346675
18806821
https://niigata-u.repo.nii.ac.jp/record/2540/files/3_S1020.pdf
eng
info:doi/10.1585/pfr.3.S1020
https://www.jstage.jst.go.jp/browse/pfr
一般社団法人プラズマ・核融合学会
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