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Results from thermionic cathode gyro-twa experiments

Phelps, A.D.R. and Ronald, K. and He, W. and Young, A.R. and Rafferty, E.G. and Cross, A.W. and Whyte, C.G. and Thomson, J. and Robertson, C.W. and , IEEE (2004) Results from thermionic cathode gyro-twa experiments. In: Conference Digest of the 2004 Joint 29th International Conference on Infrared and Millimeter Waves and 12th International Conference on Terahertz Electionics. IEEE, New Jersey, USA, pp. 273-274. ISBN 0780384903

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Abstract

Experimental operation of a gyro-travelling wave amplifier with a helically corrugated interaction region is presented. Two thermionic cathode electron guns in Pierce-type geometries were used to generate rectilinear electron beams of 1 μs pulse duration. One diode was operated at 185 keV energy with a current of 7.5 A and the other was operated with an applied potential of 115 kV producing a current of 18 A. Transverse velocity was imparted to the electron beam in a 'kicker'. The electron beam acquired a transverse velocity typically with a pitch factor of between 1 and 1.2. The resulting electron beam described a helical, axis-encircling trajectory. The coupling between the second harmonic cyclotron mode of the gyrating electron beam and the radiation field occurred in the region of near infinite phase velocity over a broad frequency band using a cylindrical waveguide with a helical corrugation on its internal surface. With a beam energy of 185 keV, the amplifier achieved a maximum output power of 220 kW, saturated gain of 24 dB, saturated bandwidth of 8.4 to 10.4 GHz (21% relative bandwidth) and an efficiency of 16%. With a beam energy of 115 keV, the amplifier achieved a maximum output power of 160 kW and an efficiency of 8%.

Item type: Book Section
ID code: 18188
Notes: Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record.
Keywords: experimental operation, gyro-travelling wave amplifier, thermionic cathode electron guns, electron beams, pulse duration, diode, energy, Physics
Subjects: Science > Physics
Department: Faculty of Science > Physics
Faculty of Humanities and Social Sciences (HaSS) > School of Psychological Science and Health > Psychology
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Depositing user: Strathprints Administrator
Date Deposited: 12 May 2010 10:06
Last modified: 12 Mar 2012 11:09
URI: http://strathprints.strath.ac.uk/id/eprint/18188

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