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Proceedings Paper

Injection locking of a long-pulse relativistic magnetron
Author(s): Shien Chi Chen; George Bekefi; Richard J. Temkin
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Paper Abstract

The authors report the injection locking results of a long-pulse (200-400 ns) high power (20-30 MW) relativistic magnetron. The cold-cathode magnetron structure is driven by a high power modulator to generate S-band output at 3.3 GHz. Phase-locking with reproducible locked angle is achieved with an injection power ratio as low as 1:200. The locked states are phase stable to within +/- 3 degree(s) during the pulse. Repetition-rated operation at 5 Hz produces average powers higher than single shot systems. Phase locking physics is studied by parametrically scanning the injection frequency and varying the injection power. Important effects due to frequency pushing are identified. The measured locking bandwidth agrees well with a theory which takes into account frequency pushing effects. The measured dependence of final locked phase on injection frequency and injection power also agrees well with theory.

Paper Details

Date Published: 1 April 1991
PDF: 7 pages
Proc. SPIE 1407, Intense Microwave and Particle Beams II, (1 April 1991); doi: 10.1117/12.43481
Show Author Affiliations
Shien Chi Chen, Massachusetts Institute of Technology/Plasma Fusion Ctr. (United States)
George Bekefi, Massachusetts Institute of Technology/Plasma Fusion Ctr. (United States)
Richard J. Temkin, Massachusetts Institute of Technology/Plasma Fusion Ctr. (United States)


Published in SPIE Proceedings Vol. 1407:
Intense Microwave and Particle Beams II
Howard E. Brandt, Editor(s)

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