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

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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.
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, PPC 2017 - Brighton, United Kingdom
Duration: 18 Jun 201722 Jun 2017

Conference

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

Fingerprint

Helical waveguides
Compressors
Microwaves
Compression ratio (machinery)
Traveling wave tubes
Pulse compression
Particle accelerators
Energy efficiency
Electron beams
Tuning
Radiation
Wavelength
Electric potential

Keywords

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

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
Macinnes, P. ; Bratman, V. L. ; Zhang, L. ; Denisov, G. G. ; He, W. ; Kolganov, N. G. ; Mcstravick, M. ; Mishakin, S. V. ; Robertson, C. W. ; Samsonov, S. V. ; Whyte, C. G. ; Young, A. R. ; Ronald, K. ; Phelps, A. D.R. ; Cross, A. W. / Periodic GW level microwave pulses in X-band from a combination of a relativistic backward wave oscillator and a helical waveguide compressor. 2017 IEEE 21st International Conference on Pulsed Power, PPC. Piscataway, N.J. : IEEE, 2018.
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title = "Periodic GW level microwave pulses in X-band from a combination of a relativistic backward wave oscillator and a helical waveguide compressor",
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.",
keywords = "high power microwave, BWO, Relativistic Backward Wave Oscillator, pulse compression",
author = "P. Macinnes and Bratman, {V. L.} and L. Zhang and Denisov, {G. G.} and W. He and Kolganov, {N. G.} and M. Mcstravick and Mishakin, {S. V.} and Robertson, {C. W.} and Samsonov, {S. V.} and Whyte, {C. G.} and Young, {A. R.} and K. Ronald and Phelps, {A. D.R.} and Cross, {A. W.}",
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booktitle = "2017 IEEE 21st International Conference on Pulsed Power, PPC",
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Macinnes, P, Bratman, VL, Zhang, L, Denisov, GG, He, W, Kolganov, NG, Mcstravick, M, Mishakin, SV, Robertson, CW, Samsonov, SV, Whyte, CG, Young, AR, Ronald, K, Phelps, ADR & Cross, AW 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, IEEE, Piscataway, N.J., 21st IEEE International Conference on Pulsed Power, PPC 2017, Brighton, United Kingdom, 18/06/17. https://doi.org/10.1109/PPC.2017.8291306

Periodic GW level microwave pulses in X-band from a combination of a relativistic backward wave oscillator and a helical waveguide compressor. / Macinnes, P.; Bratman, V. L.; Zhang, L.; Denisov, G. G.; He, W.; Kolganov, N. G.; Mcstravick, M.; Mishakin, S. V.; Robertson, C. W.; Samsonov, S. V.; Whyte, C. G.; Young, A. R.; Ronald, K.; Phelps, A. D.R.; Cross, A. W.

2017 IEEE 21st International Conference on Pulsed Power, PPC. Piscataway, N.J. : IEEE, 2018. 8291306.

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

TY - GEN

T1 - Periodic GW level microwave pulses in X-band from a combination of a relativistic backward wave oscillator and a helical waveguide compressor

AU - Macinnes, P.

AU - Bratman, V. L.

AU - Zhang, L.

AU - Denisov, G. G.

AU - He, W.

AU - Kolganov, N. G.

AU - Mcstravick, M.

AU - Mishakin, S. V.

AU - Robertson, C. W.

AU - Samsonov, S. V.

AU - Whyte, C. G.

AU - Young, A. R.

AU - Ronald, K.

AU - Phelps, A. D.R.

AU - Cross, A. W.

PY - 2018/2/13

Y1 - 2018/2/13

N2 - 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.

AB - 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.

KW - high power microwave

KW - BWO

KW - Relativistic Backward Wave Oscillator

KW - pulse compression

U2 - 10.1109/PPC.2017.8291306

DO - 10.1109/PPC.2017.8291306

M3 - Conference contribution book

SN - 9781509057481

BT - 2017 IEEE 21st International Conference on Pulsed Power, PPC

PB - IEEE

CY - Piscataway, N.J.

ER -

Macinnes P, Bratman VL, Zhang L, Denisov GG, He W, Kolganov NG et al. 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. Piscataway, N.J.: IEEE. 2018. 8291306 https://doi.org/10.1109/PPC.2017.8291306