Development of a magnetic cusp gun for a 1-THz harmonic gyrotron

Li, Fan-Hong and Du, Chao-Hai and Zhang, Zi-Wen and Li, Si-Qi and Gao, Zi-Chao and Zhu, Juan-Feng and Ma, Guo-Wu and Huang, Qi-Li and Ma, Hong-Ge and Zhang, Liang and Cross, Adrian W. and Liu, Pu-Kun (2021) Development of a magnetic cusp gun for a 1-THz harmonic gyrotron. IEEE Transactions on Electron Devices. pp. 1-6. ISSN 0018-9383 (In Press)

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    Abstract

    High-quality axis-encircling electron beam is essential to drive a high-harmonic gyrotron. A magnetic cusp gun that can generate a low-spread axis-encircling electron beam at an extremely high magnetic-compression ratio was developed for a 1-THz 4th-harmonic gyrotron toward continuous-wave operation. The optimized gun could generate an axis-encircling electron beam with 80-kV voltage, 1-A current, and a nearly constant pitch factor of about 1.5 in a wide range of magnetic field strength. The transverse velocity spread was less than 2.1% and the guiding center radius was 26.6 µm. The design was verified by using MAGIC, EGUN, and CST simulations and good agreements were achieved.

    ORCID iDs

    Li, Fan-Hong, Du, Chao-Hai, Zhang, Zi-Wen, Li, Si-Qi, Gao, Zi-Chao, Zhu, Juan-Feng, Ma, Guo-Wu, Huang, Qi-Li, Ma, Hong-Ge, Zhang, Liang ORCID logoORCID: https://orcid.org/0000-0002-6317-0395, Cross, Adrian W. ORCID logoORCID: https://orcid.org/0000-0001-7672-1283 and Liu, Pu-Kun;