Periodic GW level microwave pulses in X-band from a combination of a relativistic backward wave oscillator and a helical waveguide compressor

P. Macinnes, V. L. Bratman, L. Zhang, G. G. Denisov, W. He, N. G. Kolganov, M. Mcstravick, S. V. Mishakin, C. W. Robertson, S. V. Samsonov, C. G. Whyte, A. R. Young, K. Ronald, A. D.R. Phelps, A. W. Cross

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Abstract

Backward Wave Oscillators (BWO's) utilizing moderately relativistic (550kV), high-current (10 kA) electron beams are capable of producing hundreds of MWs of pulsed radiation in the centimeter wavelength range. Such relativistic BWOs (RBWOs) allow for broadband, smooth, frequency-tuning via adjustment of the accelerating potential; making them an attractive source for use in frequency-swept pulse compression. This paper presents results of a 2.86m long 5-fold helically corrugated, dispersive pulse compressor where a maximum power compression ratio of 25 was achieved by compressing an input microwave pulse of 80 ns duration swept from 9.65 GHz to 9.05 GHz into a 1.6ns Gaussian-envelope pulse. For an average input power of 5.8 kW generated by a conventional traveling wave tube amplifier, a peak pulse output power of 145 kW was measured corresponding to an energy efficiency of 66%. An X-band relativistic BWO, designed to drive a 0.97m long 5-fold compressor, was built and tested using the accelerating potential generated by a SINUS-6 highcurrent accelerator. The experimental RBWO operated close to the predicted power of 700MW with its oscillation frequency varied from 10 to 9.6GHz via the falling edge of the voltage pulse. It was demonstrated that the 15ns duration frequency-swept part of the RBWO pulse was effectively compressed resulting in a 4.5-fold peak power increase with a maximum power of 3.2 GW generated. The potential for a 5-fold helical waveguide to compress longer duration pulses generated by a RBWO is discussed.
Original languageEnglish
Title of host publication2017 IEEE 21st International Conference on Pulsed Power, PPC
Place of PublicationPiscataway, N.J.
PublisherIEEE
Number of pages4
ISBN (Print)9781509057481
DOIs
Publication statusPublished - 13 Feb 2018
Event21st IEEE International Conference on Pulsed Power - the Hilton Metropole Hotel, Brighton, United Kingdom
Duration: 18 Jun 201722 Jun 2017
Conference number: 21

Conference

Conference21st IEEE International Conference on Pulsed Power
Abbreviated titlePPC 2017
CountryUnited Kingdom
CityBrighton
Period18/06/1722/06/17

Keywords

  • high power microwave
  • BWO
  • Relativistic Backward Wave Oscillator
  • pulse compression

Fingerprint Dive into the research topics of 'Periodic GW level microwave pulses in X-band from a combination of a relativistic backward wave oscillator and a helical waveguide compressor'. Together they form a unique fingerprint.

  • Projects

  • Research Output

    Experimental results on microwave pulse compression using helically corrugated waveguide

    McStravick, M., Samsonov, S. V., Ronald, K., Mishakin, S. V., He, W., Denisov, G. G., Whyte, C. G., Bratman, V. L., Cross, A. W., Young, A. R., MacInnes, P., Robertson, C. W. & Phelps, A. D. R., 15 Sep 2010, In : Journal of Applied Physics. 108, 5, p. - 4 p.

    Research output: Contribution to journalArticle

  • 13 Citations (Scopus)

    Generation of 3 GW microwave pulses in X-band from a combination of a relativistic backward-wave oscillator and a helical-waveguide compressor

    Bratman, V. L., Denisov, G. G., Kolganov, N. G., Mishakin, S. V., Samsonov, S. V., Cross, A. W., He, W., Zhang, L., McStravick, M., Whyte, C. G., Young, A. R., Ronald, K., Robertson, C. W. & Phelps, A. D. R., Nov 2010, In : Physics of Plasmas. 17, 11, 3 p., 110703.

    Research output: Contribution to journalArticle

  • 29 Citations (Scopus)

    Compression of frequency-modulated pulses using helically corrugated waveguides and its potential for generating multigigawatt rf radiation

    Samsonov, S. V., Phelps, A. D. R., Bratman, V. L., Burt, G., Denisov, G. G., Cross, A. W., Ronald, K., He, W. & Yin, H., 18 Mar 2004, In : Physical Review Letters. 92, 11, 4 p., 118301.

    Research output: Contribution to journalArticle

  • 68 Citations (Scopus)

    Cite this

    Macinnes, P., Bratman, V. L., Zhang, L., Denisov, G. G., He, W., Kolganov, N. G., ... Cross, A. W. (2018). Periodic GW level microwave pulses in X-band from a combination of a relativistic backward wave oscillator and a helical waveguide compressor. In 2017 IEEE 21st International Conference on Pulsed Power, PPC [8291306] Piscataway, N.J.: IEEE. https://doi.org/10.1109/PPC.2017.8291306