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Proceedings Paper

New method for ultrahigh-frequency cyclotron maser at low magnetic field
Author(s): John A. Davies; Chiping Chen
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Paper Abstract

A new method of electron cyclotron emission is reported in which electrons emit stimulated radiation at frequencies that are greater than the usual Doppler-shifted electron cyclotron frequency by orders of magnitude. In particular, stability properties are analyzed of a relativistic electron beam gyrating in a uniform magnetic field with a strong spatiotemporal correlation in electron gyrophases. Both field amplitude equations and dispersion relations have been obtained for small-amplitude electromagnetic and electrostatic waves on a spatiotemporally gyrating relativistic electron beam. Detailed properties of such a system are studied numerically. It is shown that, if the phase velocity of the gyration pattern is close to the axial velocity, then stimulated radiation emission occurs at a frequency that is must greater than the Doppler-shifted electron frequency in both relativistic and mildly relativistic regimes. Numerical examples are presented for cyclotron maser interactions at 35 GHz and 94 GHz for electron beam voltages ranging from 100 kV to 500 kV confined by an axial magnetic field less than 6 kG.15

Paper Details

Date Published: 14 July 2000
PDF: 15 pages
Proc. SPIE 4031, Intense Microwave Pulses VII, (14 July 2000); doi: 10.1117/12.391811
Show Author Affiliations
John A. Davies, Massachusetts Institute of Technology (United States)
Chiping Chen, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 4031:
Intense Microwave Pulses VII
Howard E. Brandt, Editor(s)

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