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Title: A double-beam magnetron-injection gun for third-harmonic continuous wave 1-THz gyrotron

The concept of a continuous wave 1-kW/1-THz gyrotron operated at the third cyclotron harmonic of the transverse electric TE{sub 9,7} operating mode has been developed. To suppress the mode competition effects in a terahertz gyrotron, we propose a scheme with two generating helical electron beams (HEBs) formed in a double-beam triode magnetron-injection gun (MIG), where both emitters of the electron beams are located on a common cathode of the conventional MIG. An optimal geometry of the MIG electrodes is found. It is shown that in a proposed scheme two HEBs having close pitch factors and a moderate velocity spread can be formed. This makes them suitable for high-efficiency single-mode generation in the high frequency gyrotron at high harmonic.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [3] ;  [4]
  1. Faculty of Radiophysics, N. I. Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod 603950 (Russian Federation)
  2. (IAP RAS), Nizhny Novgorod 603600 (Russian Federation)
  3. (FIR FU), Fukui-shi 910-8507 (Japan)
  4. Research Center for Development of Far Infrared Region, University of Fukui (FIR FU), Fukui-shi 910-8507 (Japan)
Publication Date:
OSTI Identifier:
22218375
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 12; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BEAM PRODUCTION; CATHODES; CYCLOTRON HARMONICS; EFFICIENCY; ELECTRON BEAMS; ELECTRON GUNS; MAGNETRONS; MICROWAVE AMPLIFIERS; THZ RANGE; VELOCITY