The effects of electron cyclotron absorption in powerful narrow-band sub-THz oscillators exploiting volume and surface modes

MacLachlan, A. J. and Robertson, C. W. and Cross, A. W. and Phelps, A. D. R. (2023) The effects of electron cyclotron absorption in powerful narrow-band sub-THz oscillators exploiting volume and surface modes. IEEE Transactions on Electron Devices, 70 (6). pp. 2760-2766. ISSN 0018-9383 (https://doi.org/10.1109/TED.2023.3244160)

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Abstract

We present the theory, design, and numerical modeling of novel, pulsed sub-THz oscillators based on cylindrical, 2-D periodic surface lattice (PSL) interaction cavities. Investigation of the electronic efficiency and power dependence on the magnitude of the magnetic guide field and the electron beam current is investigated. While cyclotron absorption effects have been studied in low-order, 1-D backward wave oscillators (BWOs), few studies have considered cyclotron absorption in highly overmoded, 2D-PSL oscillators. Here we investigate certain behavior associated with cyclotron absorption in 2D-PSL devices with over 400 modes. This electron cyclotron absorption is shown to be a universal process, independent of frequency and transverse cavity size. Dispersive behavior shows minimal group velocity at the point of interaction and demonstrates similarities with degenerate band edge (DBE) phenomena. In this work, the fundamental mode selection mechanism relies on the coupling of high-order volume and surface waves. Good agreement between theory and modeling is presented.

ORCID iDs

MacLachlan, A. J. ORCID logoORCID: https://orcid.org/0000-0002-8960-1683, Robertson, C. W. ORCID logoORCID: https://orcid.org/0000-0002-3552-466X, Cross, A. W. ORCID logoORCID: https://orcid.org/0000-0001-7672-1283 and Phelps, A. D. R. ORCID logoORCID: https://orcid.org/0000-0002-1100-1012;
  • Item type:Article
    ID code:84266
    Dates:
    Date
    Event
    June 2023
    Published
    20 February 2023
    Published Online
    3 February 2023
    Accepted
    Notes:© 2023 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:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:17 Feb 2023 07:53
    Last modified:11 Nov 2024 13:47
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/84266
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