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, Jamie and Robertson, C.W. 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

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%.

ORCID iDs

Phelps, A.D.R. ORCID: https://orcid.org/0000-0002-1100-1012

Ronald, K. ORCID: https://orcid.org/0000-0002-8585-0746

He, W. ORCID: https://orcid.org/0000-0001-7018-0527

Young, A.R. ORCID: https://orcid.org/0000-0002-3494-1242

Cross, A.W. ORCID: https://orcid.org/0000-0001-7672-1283

Whyte, C.G. ORCID: https://orcid.org/0000-0002-5431-2443

Robertson, C.W. ORCID: https://orcid.org/0000-0002-3552-466X

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• Item metadata

  Item type:	Book Section
  ID code:	18188
  Dates:	Date Event 2004 Published
  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.
  Subjects:	Science > Physics
  Department:	Faculty of Science > Physics
  Depositing user:	Strathprints Administrator
  Date deposited:	12 May 2010 09:06
  Last modified:	11 Nov 2024 14:39
  Related URLs:	Event
  URI:	https://strathprints.strath.ac.uk/id/eprint/18188