A self-insulating, high-power, microwave source

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MacInnes, Philip and Ronald, Kevin and Cooke, Simon and Chernyavskiy, Igor and Phelps, Alan (2019) A self-insulating, high-power, microwave source. In: 5th Microwaves in Plasmas and Beams Workshop, 2019-12-04 - 2019-12-05, University of Strathclyde.

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Abstract

We present first predictions for the performance of a novel, mildly relativistic (500keV, 2kA), X-band Cherenkov oscillator, nominally a variant of the backward-wave oscillator. The source operates with no externally-applied magnetic insulation, relying only on the self-fields of the electron beam for propagation. This significantly reduces the overall energy requirements for operation, along with the complexity; conventional (magnetically insulated) sources of this type typically require magnetic field strengths of 1 – 2T for efficient beam propagation, translating to a relatively large solenoid and associated power-supply. By eliminating this factor, the overall-efficiency of the source is tightly coupled to the conversion-efficiency between the beam and the wave. Conversion efficiencies in excess of 30% have been predicted for the source, when driven by a high-quality electron beam; the parameters of which were determined via numerical modelling of the electron gun. A tolerance study of variation in the beam parameters shows the efficiency remains better than ∼25% over the variation in critical control parameters expected in experiment, with clean excitation of the intended TM01 operating mode achieved at a stable output frequency of ~9.4GHz. The resonant frequency of the source was found to be insensitive to variation in the electron energy over an extended range (400-600keV).

ORCID iDs

MacInnes, Philip ORCID logoORCID: https://orcid.org/0000-0003-2882-9817, Ronald, Kevin ORCID logoORCID: https://orcid.org/0000-0002-8585-0746, Cooke, Simon, Chernyavskiy, Igor and Phelps, Alan ORCID logoORCID: https://orcid.org/0000-0002-1100-1012;
  • Item type:Conference or Workshop Item(Other)
    ID code:71247
    Dates:
    Date
    Event
    4 December 2019
    Published
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:28 Jan 2020 15:29
    Last modified:11 Nov 2024 17:01
    URI:https://strathprints.strath.ac.uk/id/eprint/71247
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