Theoretical study of a W-band-covering frequency tunable gyrotron

Li, Fanhong and Du, Chao-hai and Gao, Zi-chao and Pan, Shi and Zhang, Liang and Liu, Pu-kun and Ronald, K. and Cross, Adrian W. (2020) Theoretical study of a W-band-covering frequency tunable gyrotron. IEEE Transactions on Electron Devices, 67 (2). pp. 659-666. 8945210. ISSN 0018-9383

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    The gyrotron has already demonstrated the capability of generating high-power coherent electromagnetic (EM) radiation at high frequencies and finds application in fusion plasma heating and magnetic resonance spectroscopy. In this article, we propose a W-band gyrotron, which uses a so-called multimode switching scheme to realize ultrabroadband frequency tuning capability, nearly covering about 70% of the W-band (75-110 GHz) range. The tuning strategy used to suppress mode competition and stabilize gun parameters in such an open-cavity multimode switching gyrotron is presented. Theoretical study shows that the multimode switching gyrotron can generate a frequency tuning range much wider than a conventional step-tuning gyrotron or a single-mode tuning gyrotron. In addition, another technology that uses a slot-assisted circuit to select only axis-symmetrical TE operating modes is presented. Using such a circuit, a tuning range of about 25 GHz in the W-band is obtainable. The proposed multimode switching gyrotron is a promising ultrabroadband source for millimeter-wave and terahertz-wave applications.