Journal
IEEE TRANSACTIONS ON PLASMA SCIENCE
Volume 49, Issue 2, Pages 734-741Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPS.2021.3051162
Keywords
Cathodes; Electron guns; Focusing; Electron beam applications; Power generation; Force; Shape; Electron gun; high compression ratio; permanent magnetic focusing; sheet beam
Categories
Funding
- National Science Foundation of China [61771454]
- Key Laboratory Fund Project from the Chinese Academy of Sciences
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A sheet beam electron gun with high compression ratio and long transmission distance performance for $W$ -band traveling-wave tube (TWT) is designed in this study, featuring a unique beam focusing electrode for equal position of beam waist and stable beam transport.
A sheet beam electron gun with high compression ratio and long transmission distance performance for $W$ -band traveling-wave tube (TWT) is presented. A beam focusing electrode (BFE) with two pairs of unequal length outstretched structures is designed to provide equal positions of beam waist in both horizontal and vertical planes, which is beneficial to obtain large compression ratio and keep the beam cross section shape over a long distance. The operational voltage is set as 30 kV. The beam current is 0.505 A, and the corresponding cathode current density is about 5.59 A/cm(2). The simulation results show that the electron gun can provide a stable sheet beam under a 0.85-T magnet field. The compression ratio of the obtained sheet beam can be over 35, and the sheet beam can be transported through a 126-mm beam tunnel without interception with a 0.6 fill factor. The parameter sensitivities of the gun are analyzed and discussed as well.
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