Scaled tests of Varian's 95-GHz slotted third-harmonic gyro-TWT amplifier

Chae K. Chong; David B. McDermott; Adam J. Balkcum; Neville C. Luhmann Jr.; Anthony T. Lin; William J. DeHope

doi:10.1117/12.175769

13 May 1994 Scaled tests of Varian's 95-GHz slotted third-harmonic gyro-TWT amplifier

Chae K. Chong, David B. McDermott, Adam J. Balkcum, Neville C. Luhmann Jr., Anthony T. Lin, William J. DeHope

Proceedings Volume 2154, Intense Microwave Pulses II; (1994) https://doi.org/10.1117/12.175769
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

A high performance, low magnetic field, moderate voltage, 95 GHz gyrotron amplifier has been designed and then tested in a scaled experiment. The slotted, third-harmonic, three- section gyro-TWT utilizes an 11.6 kG magnet and a 70 kV, 5 A, (upsilon) _{(perpendicular})/(upsilon) _(parallel) equals 1.3, axis-encircling electron beam with an axial velocity spread of 7% and is predicted by a self-consistent, nonlinear simulation code to yield a peak output power of 90 kW with an efficiency of 26%, a saturated gain of 61 dB, and a constant-drive bandwidth of 3%. The start-oscillation conditions for the absolute instability and the gyro-BWO modes were determined by analytical theory. A scaled 10 GHz, two-section slotted gyro-TWT has been tested with the axis-encircling electron beams produced by a gyroresonant rf accelerator. The preliminary results of the slotted amplifier are that it yields roughly 12 dB per section with 4% bandwidth and is not absolutely unstable at the cutoff frequency of the operating (pi) mode.

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Chae K. Chong, David B. McDermott, Adam J. Balkcum, Neville C. Luhmann Jr., Anthony T. Lin, and William J. DeHope "Scaled tests of Varian's 95-GHz slotted third-harmonic gyro-TWT amplifier", Proc. SPIE 2154, Intense Microwave Pulses II, (13 May 1994); https://doi.org/10.1117/12.175769

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