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 logoORCID: https://orcid.org/0000-0002-6317-0395 and Cross, Adrian W. ORCID logoORCID: https://orcid.org/0000-0001-7672-1283;
  • Item type:Article
    ID code:80248
    Dates:
    Date
    Event
    30 June 2022
    Published
    3 May 2022
    Published Online
    12 April 2022
    Accepted
    21 March 2022
    Submitted
    Notes:© 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:14 Nov 2024 01:17
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/80248
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