Study of ring-shaped cathodes for a high power microwave device without guiding magnetic field

The generation of annular relativistic electron beams (AREBs) with a good uniformity and longitudinal consistency needs intensive investigations, especially when no guiding magnetic field is supplied. Without a guiding magnetic field, ring-shaped cathodes with a width of several millimeters were uti...

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Bibliographic Details
Published in:Journal of applied physics 2018-09, Vol.124 (10)
Main Authors: Guo, Liming, Shu, Ting, Li, Zhiqiang, Ju, Jinchuan, Li, Ankun, Fan, Yuwei, Gao, Jingming, Yan, Longbo
Format: Article
Language:English
Subjects:
Applied physics
Carbon fibers
Cathodes
Electrons
High power microwaves
Magnetic fields
Magnetic shielding
Plasma
Relativistic electron beams
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Summary:The generation of annular relativistic electron beams (AREBs) with a good uniformity and longitudinal consistency needs intensive investigations, especially when no guiding magnetic field is supplied. Without a guiding magnetic field, ring-shaped cathodes with a width of several millimeters were utilized to generate AREB instead of knife-edged cathodes because of the space-charge force. Results of the fast framing optical photograph experiments and high power microwave (HPM) experiments show that the quarter-circular shielding electrode can improve the uniformity of the AREB obviously, and the carbon fiber cathode is validated to be an appropriate choice, which showed better emission characteristics and better performance in generating HPM than the graphite cathode and the polymer velvet cathode.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5031044