Broadband amplification of low-terahertz signals using axis-encircling electrons in a helically corrugated interaction region

He, W. and Donaldson, C. R. and Zhang, L. and Ronald, K. and Phelps, A. D. R. and Cross, A. W. (2017) Broadband amplification of low-terahertz signals using axis-encircling electrons in a helically corrugated interaction region. Physical Review Letters, 119 (18). 184801. ISSN 1079-7114 (https://doi.org/10.1103/PhysRevLett.119.184801)

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Abstract

Experimental results are presented of a broadband, high power, gyrotron traveling wave amplifier (gyro-TWA) operating in the (75–110)-GHz frequency band and based on a helically corrugated interaction region. The second harmonic cyclotron mode of a 55-keV, 1.5-A, axis-encircling electron beam is used to resonantly interact with a traveling TE21-like eigenwave achieving broadband amplification. The gyro-TWA demonstrates a 3-dB gain bandwidth of at least 5.5 GHz in the experimental measurement with 9 GHz predicted for a wideband drive source with a measured unsaturated output power of 3.4 kW and gain of 36–38 dB. The approach may allow a gyro-TWA to operate at 1 THz.

ORCID iDs

He, W. ORCID logoORCID: https://orcid.org/0000-0001-7018-0527, Donaldson, C. R. ORCID logoORCID: https://orcid.org/0000-0001-6627-2461, Zhang, L. ORCID logoORCID: https://orcid.org/0000-0002-6317-0395, Ronald, K. ORCID logoORCID: https://orcid.org/0000-0002-8585-0746, Phelps, A. D. R. ORCID logoORCID: https://orcid.org/0000-0002-1100-1012 and Cross, A. W. ORCID logoORCID: https://orcid.org/0000-0001-7672-1283;
  • Item type:Article
    ID code:62227
    Dates:
    Date
    Event
    31 October 2017
    Published
    22 September 2017
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:02 Nov 2017 11:41
    Last modified:21 Nov 2024 01:13
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/62227
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