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Radio-frequency plasma cleaning for mitigation of high-power microwave-pulse shortening in a coaxial gyrotron
Journal article   Open access   Peer reviewed

Radio-frequency plasma cleaning for mitigation of high-power microwave-pulse shortening in a coaxial gyrotron

William E. Cohen, Ronald M. Gilgenbach, Reginald L. Jaynes, Christopher W. Peters, Mike R. Lopez, Y. Y. Lau, Scott A. Anderson, Mary L. Brake and Thomas A. Spencer
Applied physics letters, v 77(23), pp 3725-3727
04 Dec 2000
DOI: https://doi.org/10.1063/1.1329862
url
https://hdl.handle.net/2027.42/71003View
Published, Version of Record (VoR)Open Access (License Unspecified),  Open
url
https://doi.org/10.1063/1.1329862View
Published, Version of Record (VoR) Open

Abstract

Results are reported demonstrating that radio-frequency (rf) plasma cleaning is an effective technique for mitigating microwave-pulse shortening (i.e., lengthening the pulse) in a multimegawatt, large-orbit, coaxial gyrotron. Cleaning plasmas were generated by 50 W of rf power at 13.56 MHz in nitrogen fill gas in the pressure range 15–25 mTorr. Improvements in the averaged microwave energy output of this high-power-microwave device ranged from 15% to 245% for different initial conditions and cleaning protocols. The mechanism for this improvement is believed to be rf plasma sputtering of excess water vapor from the cavity/waveguide and subsequent removal of the contaminant by cryogenic vacuum pumps.

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14 citations in Web of Science
15 citations in Scopus

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Industry collaboration
Domestic collaboration
Web of Science research areas
Physics, Applied
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