The development of broadband millimeter-wave and terahertz gyro-TWA
He, W. and Zhang, L. and Donaldson, C. R. and Yin, H. and Ronald, K. and Cross, A. W. and Phelps, A. D. R. (2020) The development of broadband millimeter-wave and terahertz gyro-TWA. Terahertz Science & Technology, 13 (3). pp. 90-110. ISSN 1941-7411
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Abstract
The gyrotron travelling wave tube amplifiers (gyro-TWAs) presented in this paper can operate with high efficiency (30%), huge powers and wide bandwidths at high frequencies that no other amplifier can provide. In principle, this is a technology that can be scaled to >1 THz and operate with 20% bandwidths. Resonant coupling of two dispersive waveguide modes in a helically corrugated interaction region (HCIR) can give rise to a non-dispersive eigenwave over a wide frequency band. The synchronism between the ideal wave and an electron cyclotron mode, either fundamental or harmonic, of a large orbit electron beam contributes to the broadband amplification. An electron beam of 55 keV, 1.5 A with a velocity pitch angle of ~1 generated by a thermionic cusp gun is used in our 100 GHz gyro-TWA experiment, which achieves an unsaturated output power of 3.4 kW and gain of 36–38 dB. The design and experimental results of the many components making the gyro-TWA will be presented individually and then the whole system will be introduced. The amplification of a swept signal by the W-band gyro-TWA is demonstrated showing its capabilities in the field of telecommunications. Furthermore, the design studies of a cusp electron gun in the triode configuration and the realization of a 3-fold HCIR operating at 372 GHz will also be displayed.
ORCID iDs
He, W., Zhang, L. ORCID: https://orcid.org/0000-0002-6317-0395, Donaldson, C. R. ORCID: https://orcid.org/0000-0001-6627-2461, Yin, H. ORCID: https://orcid.org/0000-0002-6635-9759, Ronald, K. ORCID: https://orcid.org/0000-0002-8585-0746, Cross, A. W. ORCID: https://orcid.org/0000-0001-7672-1283 and Phelps, A. D. R. ORCID: https://orcid.org/0000-0002-1100-1012;-
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Item type: Article ID code: 74235 Dates: DateEvent30 September 2020Published2 March 2020AcceptedSubjects: Science > Physics Department: Faculty of Science > Physics Depositing user: Pure Administrator Date deposited: 14 Oct 2020 08:45 Last modified: 11 Nov 2024 12:51 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/74235