期刊
IEEE TRANSACTIONS ON PLASMA SCIENCE
卷 42, 期 12, 页码 3996-4003出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPS.2014.2365582
关键词
220-GHz traveling-wave tube (TWT); attenuator; electron gun; focusing electrode; periodically cusped magnet (PCM); sheet electron beam; slow-wave structure (SWS); staggered double vane
资金
- Fundamental Research Funds for the Central Universities [ZYGX2013Z002, ZYGX2013J054]
- China National Funds for Distinguished Young Scientist [61125103]
- National Key Laboratory Foundation of China [9140c050102120c05016]
In this paper, a wideband 220-GHz sheet-beam traveling-wave tube (TWT) based on staggered double vane slow-wave structure (SWS) is investigated. A novel method of loading the attenuator into the SWS for suppressing backward wave oscillation is proposed. In addition, a novel focusing electrode of the sheet beam gun is carried out in this paper, which is a whole structure but divided into two parts artificially, one is used to compress the electron beam in X-direction and the other is used to compress the electron beam in Y-direction. In addition, a novel anode is redesigned to reduce the defocusing effect caused by the equipotential surfaces. A nonuniform periodically cusped magnet is used for focusing the sheet electron beam, which is predicted to exhibit 100% beam transmission efficiency in a 75-mm length drift tube. The high-frequency characteristics of the SWS and the beam-wave interaction are also studied. The results reveal that the designed TWT is expected to generate over 78.125-W average power at 214 GHz, and the 3-dB bandwidth is 31.5 GHz, ranging from 203 to 234.5 GHz.
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