Microwave pulse compression using a helically corrugated waveguide

Graeme Burt, S.V. Samsonov, A.D.R. Phelps, V.L. Bratman, K. Ronald, G.G. Denisov, W. He, A.R. Young, A.W. Cross, I.V. Konoplev

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

There has been a drive in recent years to produce ultrahigh power short microwave pulses for a range of applications. These high-power pulses can be produced by microwave pulse compression. Sweep-frequency based microwave pulse compression using smooth bore hollow waveguides is one technique of passive pulse compression, however, at very high powers, this method has some limitation due to its operation close to cutoff. A special helical corrugation of a circular waveguide ensures an eigenwave with strongly frequency dependent group velocity far from cutoff, which makes the helically corrugated waveguide attractive for use as a passive pulse compressor for very high-power amplifiers and oscillators. The results of proof-of-principle experiments and calculations of the wave dispersion using a particle in cell particle-in-cell (PIC) code are presented. In the experiments, a 70-ns 1-kW pulse from a conventional traveling-wave tube (TWT) was compressed in a 2-m-long helical waveguide. The compressed pulse had a peak power of 10.9 kW and duration of 3 ns. In order to find the optimum pulse compression ratio, the waveguide's dispersion characteristics must be well known. The dispersion of the helix was calculated using the PIC code Magic and verified using an experimental technique. Future work detailing plans to produce short ultrahigh power gigawatt (GW) pulses will be discussed.
LanguageEnglish
Pages661-667
Number of pages6
JournalIEEE Transactions on Plasma Science
Volume33
Issue number2
DOIs
Publication statusPublished - Apr 2005

Fingerprint

corrugated waveguides
pulse compression
microwaves
pulses
waveguides
cut-off
circular waveguides
traveling wave tubes
sweep frequency
compression ratio
wave dispersion
compressors
power amplifiers
group velocity
helices
hollow
oscillators
cavities
cells

Keywords

  • circular waveguides
  • dispersion (wave)
  • helical waveguides
  • microwave generation
  • pulse compression
  • travelling wave tubes
  • plasma

Cite this

Burt, Graeme ; Samsonov, S.V. ; Phelps, A.D.R. ; Bratman, V.L. ; Ronald, K. ; Denisov, G.G. ; He, W. ; Young, A.R. ; Cross, A.W. ; Konoplev, I.V. / Microwave pulse compression using a helically corrugated waveguide. In: IEEE Transactions on Plasma Science. 2005 ; Vol. 33, No. 2. pp. 661-667.
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Microwave pulse compression using a helically corrugated waveguide. / Burt, Graeme; Samsonov, S.V.; Phelps, A.D.R.; Bratman, V.L.; Ronald, K.; Denisov, G.G.; He, W.; Young, A.R.; Cross, A.W.; Konoplev, I.V.

In: IEEE Transactions on Plasma Science, Vol. 33, No. 2, 04.2005, p. 661-667.

Research output: Contribution to journalArticle

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T1 - Microwave pulse compression using a helically corrugated waveguide

AU - Burt, Graeme

AU - Samsonov, S.V.

AU - Phelps, A.D.R.

AU - Bratman, V.L.

AU - Ronald, K.

AU - Denisov, G.G.

AU - He, W.

AU - Young, A.R.

AU - Cross, A.W.

AU - Konoplev, I.V.

N1 - This work was carried out while Graeme Burt was a PhD student in the Physics Department, University of Strathclyde. When the paper was published in 2005 Graeme Burt had taken up an appointment at the University of Lancaster & The Cockcroft Institute.

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N2 - There has been a drive in recent years to produce ultrahigh power short microwave pulses for a range of applications. These high-power pulses can be produced by microwave pulse compression. Sweep-frequency based microwave pulse compression using smooth bore hollow waveguides is one technique of passive pulse compression, however, at very high powers, this method has some limitation due to its operation close to cutoff. A special helical corrugation of a circular waveguide ensures an eigenwave with strongly frequency dependent group velocity far from cutoff, which makes the helically corrugated waveguide attractive for use as a passive pulse compressor for very high-power amplifiers and oscillators. The results of proof-of-principle experiments and calculations of the wave dispersion using a particle in cell particle-in-cell (PIC) code are presented. In the experiments, a 70-ns 1-kW pulse from a conventional traveling-wave tube (TWT) was compressed in a 2-m-long helical waveguide. The compressed pulse had a peak power of 10.9 kW and duration of 3 ns. In order to find the optimum pulse compression ratio, the waveguide's dispersion characteristics must be well known. The dispersion of the helix was calculated using the PIC code Magic and verified using an experimental technique. Future work detailing plans to produce short ultrahigh power gigawatt (GW) pulses will be discussed.

AB - There has been a drive in recent years to produce ultrahigh power short microwave pulses for a range of applications. These high-power pulses can be produced by microwave pulse compression. Sweep-frequency based microwave pulse compression using smooth bore hollow waveguides is one technique of passive pulse compression, however, at very high powers, this method has some limitation due to its operation close to cutoff. A special helical corrugation of a circular waveguide ensures an eigenwave with strongly frequency dependent group velocity far from cutoff, which makes the helically corrugated waveguide attractive for use as a passive pulse compressor for very high-power amplifiers and oscillators. The results of proof-of-principle experiments and calculations of the wave dispersion using a particle in cell particle-in-cell (PIC) code are presented. In the experiments, a 70-ns 1-kW pulse from a conventional traveling-wave tube (TWT) was compressed in a 2-m-long helical waveguide. The compressed pulse had a peak power of 10.9 kW and duration of 3 ns. In order to find the optimum pulse compression ratio, the waveguide's dispersion characteristics must be well known. The dispersion of the helix was calculated using the PIC code Magic and verified using an experimental technique. Future work detailing plans to produce short ultrahigh power gigawatt (GW) pulses will be discussed.

KW - circular waveguides

KW - dispersion (wave)

KW - helical waveguides

KW - microwave generation

KW - pulse compression

KW - travelling wave tubes

KW - plasma

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JO - IEEE Transactions on Plasma Science

T2 - IEEE Transactions on Plasma Science

JF - IEEE Transactions on Plasma Science

SN - 0093-3813

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