Title :
Millimeter-wave gyroklystron amplifier experiment using a relativistic electron beam
Author :
Gold, Steven H. ; Fliflet, Arne W. ; Manheimer, Wallace M. ; Kirkpatrick, Douglas A. ; Black, W. Murray ; Kinkead, Allen K. ; Hardesty, Delbert L. ; Sucy, Mark S.
Author_Institution :
US Naval Res. Lab., Washington, DC, USA
fDate :
12/1/1990 12:00:00 AM
Abstract :
A fundamental-mode TE111° two-cavity intense-beam gyroklystron amplifier experiment, operating at an accelerating voltage of 1 MV, is reported. The two cavities that were tested are designed to serve as bunching cavities for a high-power output cavity. The two-cavity amplifier has demonstrated a linear gain of 15 dB and an unsaturated output power of ~40 kW, with the intracavity gain and power ~4 dB higher. The frequency of the second cavity has been found to track the frequency of the driven cavity over a range of 300 MHz around a center frequency of 35 GHz. Stable amplifier operation was achieved with beam currents as large as 150 A and a velocity pitch ratio of 0.36. The stable operating range was limited by spurious oscillation in the TE112° mode. Theoretical calculations indicate that higher gains might be attainable if this mode could be suppressed
Keywords :
gyrotrons; klystrons; microwave amplifiers; relativistic electron beam tubes; 1 MV; 150 A; 300 MHz; 35 GHz; 40 kW; TE112° mode; accelerating voltage; bunching cavities; driven cavity; fundamental-mode TE111° two-cavity intense-beam gyroklystron amplifier; high-power output cavity; linear gain; millimeter-wave gyroklystron amplifier; mode suppression; relativistic electron beam; spurious oscillation; unsaturated output power; velocity pitch ratio; Acceleration; Frequency; Gain; High power amplifiers; Klystrons; Power amplifiers; Power generation; Tellurium; Testing; Voltage;
Journal_Title :
Plasma Science, IEEE Transactions on
