Design of a 1-THz fourth-harmonic gyrotron driven by axis-encircling electron beam
Li, Fan-Hong and Du, Chao-Hai and Zhang, Zi-Wen and Li, Si-Qi and Gao, Zi-Chao and Liu, Pu-Kun and Ma, Guo-Wu and Huang, Qi-Li and Ma, Hong-Ge and Zhang, Liang and Cross, Adrian W. (2022) Design of a 1-THz fourth-harmonic gyrotron driven by axis-encircling electron beam. IEEE Transactions on Electron Devices, 69 (6). pp. 3393-3399. ISSN 0018-9383 (https://doi.org/10.1109/TED.2022.3168245)
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Abstract
In this article, the design of a fourth-harmonic gyrotron with 1-kW-level output power at 1 terahertz (THz) is presented. A unique advantage of this design is that, with a well-optimized magnetic-cusp large-orbit electron gun, the designed gyrotron can operate from first-harmonic to fourth-harmonic in multiple discrete bands by varying the confining magnetic field strength. By carefully balancing the competing modes, the gyrotron can be tuned to operate at six candidate modes, including TE1,2 for fundamental harmonic, TE2,3 and TE2,4 for second-harmonic, TE3,5 and TE3,6 for third-harmonic, and TE4,8 for fourth-harmonic interactions. As the main operating mode, the TE4,8 can generate a peak output power of 1.68 kW, with an output efficiency of about 2.1%, and a magnetically controlled frequency tuning range of about 1.5 GHz around 1 THz. The impact of the longitudinal nonuniformity of the cavity at high-harmonic interaction was also studied. It shows that a radial tolerance of several micrometers will significantly elevate the start-oscillation current and deteriorate output performance. This design is to produce a THz source with ultra-wideband tuning capability ranging from the submillimeter-wave to 1-THz bands.
ORCID iDs
Li, Fan-Hong, Du, Chao-Hai, Zhang, Zi-Wen, Li, Si-Qi, Gao, Zi-Chao, Liu, Pu-Kun, Ma, Guo-Wu, Huang, Qi-Li, Ma, Hong-Ge, Zhang, Liang ORCID: https://orcid.org/0000-0002-6317-0395 and Cross, Adrian W. ORCID: https://orcid.org/0000-0001-7672-1283;-
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Item type: Article ID code: 80248 Dates: DateEvent30 June 2022Published3 May 2022Published Online12 April 2022Accepted21 March 2022SubmittedNotes: © 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Subjects: Technology > Electrical engineering. Electronics Nuclear engineering Department: Faculty of Science > Physics Depositing user: Pure Administrator Date deposited: 21 Apr 2022 10:57 Last modified: 30 Aug 2024 01:10 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/80248