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16 - Crossed-Field Amplifiers

Published online by Cambridge University Press:  27 April 2018

Richard G. Carter
Richard G. Carter
Affiliation:
Lancaster University
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Summary

The crossed-field amplifier (CFA) resembles a magnetron in which the ends of the slow-wave structure are connected to external waveguides so that broad-band operation is possible. CFAs have been built with injected beams, with emission from the cathode (sole) and with both forward-wave and backward wave structures. The only type which is of continuing importance is the emitting sole CFA. The types of slow-wave structure and the use of thermionic and cold (secondary emission) cathodes are reviewed. The principles of operation and operating characteristics are discussed. The operation of CFAs which is always non-linear can be modelled with particle-in-cell (PIC) codes and with guiding centre and rigid spoke approximations to the electron trajectories. A rigid spoke model in which the local properties are computed from an equivalent magnetron is described in detail. This model reproduces the main features of the performance of a CFA. The principles of CFA design are reviewed.

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Microwave and RF Vacuum Electronic Power Sources , pp. 629 - 658
Publisher: Cambridge University Press
Print publication year: 2018

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  • Crossed-Field Amplifiers
  • Richard G. Carter, Lancaster University
  • Book: Microwave and RF Vacuum Electronic Power Sources
  • Online publication: 27 April 2018
  • Chapter DOI: https://doi.org/10.1017/9780511979231.017
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  • Crossed-Field Amplifiers
  • Richard G. Carter, Lancaster University
  • Book: Microwave and RF Vacuum Electronic Power Sources
  • Online publication: 27 April 2018
  • Chapter DOI: https://doi.org/10.1017/9780511979231.017
Available formats
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  • Crossed-Field Amplifiers
  • Richard G. Carter, Lancaster University
  • Book: Microwave and RF Vacuum Electronic Power Sources
  • Online publication: 27 April 2018
  • Chapter DOI: https://doi.org/10.1017/9780511979231.017
Available formats
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