Excitation of electromagnetic modes in a dielectric-loaded waveguide via cyclotron resonance interaction

Journal Article · Sat Feb 01 04:00:00 EST 1986 · IEEE Trans. Plasma Sci.; (United States)

DOI:https://doi.org/10.1109/TPS.1986.4316493· OSTI ID:6071713

Jain, V K; Tripathi, V K; Patnaik, R K

An analytical treatment of the excitation of electromagnetic modes by an axial electron beam in a cylindrical waveguide partially loaded with a dielectric is presented. Equations describing the mode structure of the waves are obtained in cylindrical geometry. Using appropriate boundary conditions a dispersion relation is derived in the weak-beam approximation (..omega../sub B/ << ..omega..). In addition to the conventional Cerenkov interaction, the slow-cyclotron resonance interaction (..omega.. approx. = ..beta..V/sub 0/ - ..omega../sub C/), which involves the coupling of the TM mode of the waveguide with the slow cyclotron beam mode, is also seen to be important. The growth rate of the instability scales as eta/sub 0//sup 1/2/ (where eta/sub 0/ is the beam density), decreases with and increase in V/sub 0/, and is rather insensitive to the variation in the magnetic field.

• Research Organization: Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110 016
• OSTI ID: 6071713
• Journal Information: IEEE Trans. Plasma Sci.; (United States), Journal Name: IEEE Trans. Plasma Sci.; (United States) Vol. PS-14:1; ISSN ITPSB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BEAMS
BOUNDARY CONDITIONS
CYCLOTRON RESONANCE
DIELECTRIC MATERIALS
DISPERSION RELATIONS
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
ELECTRON CYCLOTRON-RESONANCE
ENERGY-LEVEL TRANSITIONS
EQUATIONS
EXCITATION
INSTABILITY
LEPTON BEAMS
MAGNETIC FIELDS
MATERIALS
PARTICLE BEAMS
RADIATIONS
RESONANCE
WAVE PROPAGATION
WAVEGUIDES