Helically corrugated waveguides for compression of frequency swept microwave pulses

P. MacInnes; A. W. Cross; K. Ronald; A. D. R. Phelps; W. He; G. Burt; A. R. Young; C. G. Whyte; S. V. Samsonov; G. G. Denisov; V. L. Bratman

Helically corrugated waveguides for compression of frequency swept microwave pulses

P. MacInnes^*, A. W. Cross, K. Ronald, A. D. R. Phelps, W. He, G. Burt, A. R. Young, C. G. Whyte, S. V. Samsonov, G. G. Denisov, V. L. Bratman

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution book

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Abstract

Short pulse high power microwave radiation can be used for time of flight diagnostic measurements in plasmas, e.g. density profiles by reflectometry. A three-fold helical corrugation of the inner surface of a waveguide synthesises eigenwaves having useful dispersive properties by combining two distinct counter-rotating modes of a corresponding circular waveguide. The dispersion may be tailored to the requirements of an application by adjusting the amplitude and period of the corrugations. Such dispersive properties have proven useful in broadband radiation amplifiers, or to achieve passive compression of smoothly frequency modulated microwave pulses. The paper presents results of experiments using a solid state source to produce an optimised frequency-chirped input pulse and amplified by a high power Travelling Wave Tube Amplifier (TWTA). The waveforms of the input and output microwave signals were captured on a UHF Digital Storage Oscilloscope. The results demonstrated at 5.7kW input power levels that X-band radiation pulses of 67ns duration with 5% frequency modulation can be compressed into a 2.8ns pulse having 12 times higher peak power, whilst retaining 50% of the energy in the input signal. The technique offers great potential for scaling to higher frequencies and power levels.

Original language	English
Title of host publication	33rd EPS Conference on Plasma Physics 2006, EPS 2006 - Europhysics Conference Abstracts
Editors	F. De Marco, G. Vlad
Pages	2316-2319
Number of pages	4
Volume	301
Publication status	Published - 1 Dec 2006
Event	33rd European Physical Society Conference on Plasma Physics 2006, EPS 2006 - Rome, Italy Duration: 19 Jun 2006 → 23 Jun 2006

Publication series

Name	33rd EPS Conference on Plasma Physics 2006, EPS 2006
Volume	3

Conference

Conference	33rd European Physical Society Conference on Plasma Physics 2006, EPS 2006
Country/Territory	Italy
City	Rome
Period	19/06/06 → 23/06/06

Keywords

high power microwave radiation
plasmas
Helically corrugated waveguides (HCWs)
pulse compression

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MacInnes, P., Cross, A. W., Ronald, K., Phelps, A. D. R., He, W., Burt, G., Young, A. R., Whyte, C. G., Samsonov, S. V., Denisov, G. G., & Bratman, V. L. (2006). Helically corrugated waveguides for compression of frequency swept microwave pulses. In F. De Marco, & G. Vlad (Eds.), 33rd EPS Conference on Plasma Physics 2006, EPS 2006 - Europhysics Conference Abstracts (Vol. 301, pp. 2316-2319). (33rd EPS Conference on Plasma Physics 2006, EPS 2006; Vol. 3).

@inproceedings{9f8c4a5cf50442f98b8fbe67ed12cfdf,

title = "Helically corrugated waveguides for compression of frequency swept microwave pulses",

abstract = "Short pulse high power microwave radiation can be used for time of flight diagnostic measurements in plasmas, e.g. density profiles by reflectometry. A three-fold helical corrugation of the inner surface of a waveguide synthesises eigenwaves having useful dispersive properties by combining two distinct counter-rotating modes of a corresponding circular waveguide. The dispersion may be tailored to the requirements of an application by adjusting the amplitude and period of the corrugations. Such dispersive properties have proven useful in broadband radiation amplifiers, or to achieve passive compression of smoothly frequency modulated microwave pulses. The paper presents results of experiments using a solid state source to produce an optimised frequency-chirped input pulse and amplified by a high power Travelling Wave Tube Amplifier (TWTA). The waveforms of the input and output microwave signals were captured on a UHF Digital Storage Oscilloscope. The results demonstrated at 5.7kW input power levels that X-band radiation pulses of 67ns duration with 5% frequency modulation can be compressed into a 2.8ns pulse having 12 times higher peak power, whilst retaining 50% of the energy in the input signal. The technique offers great potential for scaling to higher frequencies and power levels. ",

keywords = "high power microwave radiation, plasmas, Helically corrugated waveguides (HCWs), pulse compression",

author = "P. MacInnes and Cross, {A. W.} and K. Ronald and Phelps, {A. D. R.} and W. He and G. Burt and Young, {A. R.} and Whyte, {C. G.} and Samsonov, {S. V.} and Denisov, {G. G.} and Bratman, {V. L.}",

year = "2006",

month = dec,

day = "1",

language = "English",

isbn = "9781622763337",

volume = "301",

series = "33rd EPS Conference on Plasma Physics 2006, EPS 2006",

pages = "2316--2319",

editor = "{De Marco}, F. and G. Vlad",

booktitle = "33rd EPS Conference on Plasma Physics 2006, EPS 2006 - Europhysics Conference Abstracts",

note = "33rd European Physical Society Conference on Plasma Physics 2006, EPS 2006 ; Conference date: 19-06-2006 Through 23-06-2006",

}

MacInnes, P, Cross, AW, Ronald, K , Phelps, ADR, He, W, Burt, G, Young, AR , Whyte, CG, Samsonov, SV, Denisov, GG & Bratman, VL 2006, Helically corrugated waveguides for compression of frequency swept microwave pulses. in F De Marco & G Vlad (eds), 33rd EPS Conference on Plasma Physics 2006, EPS 2006 - Europhysics Conference Abstracts. vol. 301, 33rd EPS Conference on Plasma Physics 2006, EPS 2006, vol. 3, pp. 2316-2319, 33rd European Physical Society Conference on Plasma Physics 2006, EPS 2006, Rome, Italy, 19/06/06.

Helically corrugated waveguides for compression of frequency swept microwave pulses. / MacInnes, P.; Cross, A. W.; Ronald, K. et al.
33rd EPS Conference on Plasma Physics 2006, EPS 2006 - Europhysics Conference Abstracts. ed. / F. De Marco; G. Vlad. Vol. 301 2006. p. 2316-2319 (33rd EPS Conference on Plasma Physics 2006, EPS 2006; Vol. 3).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution book

TY - GEN

T1 - Helically corrugated waveguides for compression of frequency swept microwave pulses

AU - MacInnes, P.

AU - Cross, A. W.

AU - Ronald, K.

AU - Phelps, A. D. R.

AU - He, W.

AU - Burt, G.

AU - Young, A. R.

AU - Whyte, C. G.

AU - Samsonov, S. V.

AU - Denisov, G. G.

AU - Bratman, V. L.

PY - 2006/12/1

Y1 - 2006/12/1

N2 - Short pulse high power microwave radiation can be used for time of flight diagnostic measurements in plasmas, e.g. density profiles by reflectometry. A three-fold helical corrugation of the inner surface of a waveguide synthesises eigenwaves having useful dispersive properties by combining two distinct counter-rotating modes of a corresponding circular waveguide. The dispersion may be tailored to the requirements of an application by adjusting the amplitude and period of the corrugations. Such dispersive properties have proven useful in broadband radiation amplifiers, or to achieve passive compression of smoothly frequency modulated microwave pulses. The paper presents results of experiments using a solid state source to produce an optimised frequency-chirped input pulse and amplified by a high power Travelling Wave Tube Amplifier (TWTA). The waveforms of the input and output microwave signals were captured on a UHF Digital Storage Oscilloscope. The results demonstrated at 5.7kW input power levels that X-band radiation pulses of 67ns duration with 5% frequency modulation can be compressed into a 2.8ns pulse having 12 times higher peak power, whilst retaining 50% of the energy in the input signal. The technique offers great potential for scaling to higher frequencies and power levels.

AB - Short pulse high power microwave radiation can be used for time of flight diagnostic measurements in plasmas, e.g. density profiles by reflectometry. A three-fold helical corrugation of the inner surface of a waveguide synthesises eigenwaves having useful dispersive properties by combining two distinct counter-rotating modes of a corresponding circular waveguide. The dispersion may be tailored to the requirements of an application by adjusting the amplitude and period of the corrugations. Such dispersive properties have proven useful in broadband radiation amplifiers, or to achieve passive compression of smoothly frequency modulated microwave pulses. The paper presents results of experiments using a solid state source to produce an optimised frequency-chirped input pulse and amplified by a high power Travelling Wave Tube Amplifier (TWTA). The waveforms of the input and output microwave signals were captured on a UHF Digital Storage Oscilloscope. The results demonstrated at 5.7kW input power levels that X-band radiation pulses of 67ns duration with 5% frequency modulation can be compressed into a 2.8ns pulse having 12 times higher peak power, whilst retaining 50% of the energy in the input signal. The technique offers great potential for scaling to higher frequencies and power levels.

KW - high power microwave radiation

KW - plasmas

KW - Helically corrugated waveguides (HCWs)

KW - pulse compression

UR - http://epsppd.epfl.ch/Roma/start.htm

M3 - Conference contribution book

AN - SCOPUS:84872654426

SN - 9781622763337

VL - 301

T3 - 33rd EPS Conference on Plasma Physics 2006, EPS 2006

SP - 2316

EP - 2319

BT - 33rd EPS Conference on Plasma Physics 2006, EPS 2006 - Europhysics Conference Abstracts

A2 - De Marco, F.

A2 - Vlad, G.

T2 - 33rd European Physical Society Conference on Plasma Physics 2006, EPS 2006

Y2 - 19 June 2006 through 23 June 2006

ER -

Helically corrugated waveguides for compression of frequency swept microwave pulses

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