Gyro-BWO experiments using a helical interaction waveguide

W. He, K. Ronald, A.R. Young, A.W. Cross, A.D.R. Phelps, C.G. Whyte, E.G. Rafferty, J. Thomson, C.W. Robertson, David Speirs, S.V. Samsonov, V.L. Bratman, G.G. Denisov

Research output: Contribution to journalArticle

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Abstract

A helically corrugated waveguide was used for a gyrotron backward-wave oscillator (gyro-BWO) experiment. A thermionic cathode was used to produce an electron beam of 90-215 keV in energy, 2-3 A in current, and pitch alpha of up to 1.6. The oscillator achieved high-efficiency frequency-tunable operation. At a fixed beam voltage of 185 kV and a current of 2 A, the output frequency was tuned by adjusting the magnetic field in the interaction cavity. A maximum power of 62 kW and a 3-dB frequency-tuning band of 8.0-9.5 GHz (17% relative tuning range) with a maximum electronic efficiency of 16.5% were measured. In addition, the interaction frequency could be tuned by varying the electron beam energy. At a fixed cavity magnetic field of 0.195 T, the output frequency and power from the gyro-BWO were measured as a function of tuning electron beam energy while the beam current was maintained at 2.5 A. A 3-dB relative frequency tuning range of 8% was measured when the electron beam voltage was changed from 215 to 110 kV.
Original languageEnglish
Pages (from-to)839-844
Number of pages5
JournalIEEE Transactions on Electron Devices
Volume52
Issue number5
DOIs
Publication statusPublished - May 2005

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Electron beams
Waveguides
Tuning
Thermionic cathodes
Experiments
Magnetic fields
Beam plasma interactions
Electric potential

Keywords

  • backward wave oscillators
  • gyrotrons
  • helical waveguides
  • thermionic cathodes
  • plasma
  • cyclotron-resonance maser
  • high-power microwave devices

Cite this

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title = "Gyro-BWO experiments using a helical interaction waveguide",
abstract = "A helically corrugated waveguide was used for a gyrotron backward-wave oscillator (gyro-BWO) experiment. A thermionic cathode was used to produce an electron beam of 90-215 keV in energy, 2-3 A in current, and pitch alpha of up to 1.6. The oscillator achieved high-efficiency frequency-tunable operation. At a fixed beam voltage of 185 kV and a current of 2 A, the output frequency was tuned by adjusting the magnetic field in the interaction cavity. A maximum power of 62 kW and a 3-dB frequency-tuning band of 8.0-9.5 GHz (17{\%} relative tuning range) with a maximum electronic efficiency of 16.5{\%} were measured. In addition, the interaction frequency could be tuned by varying the electron beam energy. At a fixed cavity magnetic field of 0.195 T, the output frequency and power from the gyro-BWO were measured as a function of tuning electron beam energy while the beam current was maintained at 2.5 A. A 3-dB relative frequency tuning range of 8{\%} was measured when the electron beam voltage was changed from 215 to 110 kV.",
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author = "W. He and K. Ronald and A.R. Young and A.W. Cross and A.D.R. Phelps and C.G. Whyte and E.G. Rafferty and J. Thomson and C.W. Robertson and David Speirs and S.V. Samsonov and V.L. Bratman and G.G. Denisov",
year = "2005",
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Gyro-BWO experiments using a helical interaction waveguide. / He, W.; Ronald, K.; Young, A.R.; Cross, A.W.; Phelps, A.D.R.; Whyte, C.G.; Rafferty, E.G.; Thomson, J.; Robertson, C.W.; Speirs, David; Samsonov, S.V.; Bratman, V.L.; Denisov, G.G.

In: IEEE Transactions on Electron Devices, Vol. 52, No. 5, 05.2005, p. 839-844.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Gyro-BWO experiments using a helical interaction waveguide

AU - He, W.

AU - Ronald, K.

AU - Young, A.R.

AU - Cross, A.W.

AU - Phelps, A.D.R.

AU - Whyte, C.G.

AU - Rafferty, E.G.

AU - Thomson, J.

AU - Robertson, C.W.

AU - Speirs, David

AU - Samsonov, S.V.

AU - Bratman, V.L.

AU - Denisov, G.G.

PY - 2005/5

Y1 - 2005/5

N2 - A helically corrugated waveguide was used for a gyrotron backward-wave oscillator (gyro-BWO) experiment. A thermionic cathode was used to produce an electron beam of 90-215 keV in energy, 2-3 A in current, and pitch alpha of up to 1.6. The oscillator achieved high-efficiency frequency-tunable operation. At a fixed beam voltage of 185 kV and a current of 2 A, the output frequency was tuned by adjusting the magnetic field in the interaction cavity. A maximum power of 62 kW and a 3-dB frequency-tuning band of 8.0-9.5 GHz (17% relative tuning range) with a maximum electronic efficiency of 16.5% were measured. In addition, the interaction frequency could be tuned by varying the electron beam energy. At a fixed cavity magnetic field of 0.195 T, the output frequency and power from the gyro-BWO were measured as a function of tuning electron beam energy while the beam current was maintained at 2.5 A. A 3-dB relative frequency tuning range of 8% was measured when the electron beam voltage was changed from 215 to 110 kV.

AB - A helically corrugated waveguide was used for a gyrotron backward-wave oscillator (gyro-BWO) experiment. A thermionic cathode was used to produce an electron beam of 90-215 keV in energy, 2-3 A in current, and pitch alpha of up to 1.6. The oscillator achieved high-efficiency frequency-tunable operation. At a fixed beam voltage of 185 kV and a current of 2 A, the output frequency was tuned by adjusting the magnetic field in the interaction cavity. A maximum power of 62 kW and a 3-dB frequency-tuning band of 8.0-9.5 GHz (17% relative tuning range) with a maximum electronic efficiency of 16.5% were measured. In addition, the interaction frequency could be tuned by varying the electron beam energy. At a fixed cavity magnetic field of 0.195 T, the output frequency and power from the gyro-BWO were measured as a function of tuning electron beam energy while the beam current was maintained at 2.5 A. A 3-dB relative frequency tuning range of 8% was measured when the electron beam voltage was changed from 215 to 110 kV.

KW - backward wave oscillators

KW - gyrotrons

KW - helical waveguides

KW - thermionic cathodes

KW - plasma

KW - cyclotron-resonance maser

KW - high-power microwave devices

UR - http://dx.doi.org/10.1109/TED.2005.845858

U2 - 10.1109/TED.2005.845858

DO - 10.1109/TED.2005.845858

M3 - Article

VL - 52

SP - 839

EP - 844

JO - IEEE Transactions on Electron Devices

JF - IEEE Transactions on Electron Devices

SN - 0018-9383

IS - 5

ER -