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
SN - 0018-9383
VL - 52
SP - 839
EP - 844
JO - IEEE Transactions on Electron Devices
JF - IEEE Transactions on Electron Devices
IS - 5
ER -