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Title: Formation of a laminar electron flow for 300 GHz high-power pulsed gyrotron

Abstract

This paper describes the design of a triode magnetron injection gun for use in a 200 kW, 300 GHz gyrotron. As power and frequency increase, the performance of the gyrotron becomes quite sensitive to the quality of the electron beam. Formation of a laminar electron flow is essential for the realization of a high quality beam with a small velocity spread. In this study, a new method is developed for a quantitative evaluation of the laminarity and is applied to optimize the electrode design. The laminarity depends not only on conventional design parameters such as the cathode slant angle but also on the spatial distribution of the electric field along the beam trajectory. In the optimized design, the velocity pitch factors, {alpha}, larger than 1.2 are obtained at 65 kV, 10 A with spreads, {Delta}{alpha}, less than 5%.

Authors:
; ; ; ; ; ;  [1]
  1. Research Center for Development of Far-Infrared Region, University of Fukui, 3-9-1 Bunkyo, Fukui-shi 910-8507 (Japan)
Publication Date:
OSTI Identifier:
22068914
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 19; Journal Issue: 11; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BEAM INJECTION; CATHODES; DESIGN; ELECTRIC FIELDS; ELECTRON BEAMS; GHZ RANGE; LAMINAR FLOW; MAGNETRONS; MICROWAVE AMPLIFIERS; PERFORMANCE; SPATIAL DISTRIBUTION

Citation Formats

Yamaguchi, Yuusuke, Tatematsu, Yoshinori, Saito, Teruo, Ikeda, Ryosuke, Mudiganti, Jagadish C., Ogawa, Isamu, and Idehara, Toshitaka. Formation of a laminar electron flow for 300 GHz high-power pulsed gyrotron. United States: N. p., 2012. Web. doi:10.1063/1.4768959.
Yamaguchi, Yuusuke, Tatematsu, Yoshinori, Saito, Teruo, Ikeda, Ryosuke, Mudiganti, Jagadish C., Ogawa, Isamu, & Idehara, Toshitaka. Formation of a laminar electron flow for 300 GHz high-power pulsed gyrotron. United States. doi:10.1063/1.4768959.
Yamaguchi, Yuusuke, Tatematsu, Yoshinori, Saito, Teruo, Ikeda, Ryosuke, Mudiganti, Jagadish C., Ogawa, Isamu, and Idehara, Toshitaka. Thu . "Formation of a laminar electron flow for 300 GHz high-power pulsed gyrotron". United States. doi:10.1063/1.4768959.
@article{osti_22068914,
title = {Formation of a laminar electron flow for 300 GHz high-power pulsed gyrotron},
author = {Yamaguchi, Yuusuke and Tatematsu, Yoshinori and Saito, Teruo and Ikeda, Ryosuke and Mudiganti, Jagadish C. and Ogawa, Isamu and Idehara, Toshitaka},
abstractNote = {This paper describes the design of a triode magnetron injection gun for use in a 200 kW, 300 GHz gyrotron. As power and frequency increase, the performance of the gyrotron becomes quite sensitive to the quality of the electron beam. Formation of a laminar electron flow is essential for the realization of a high quality beam with a small velocity spread. In this study, a new method is developed for a quantitative evaluation of the laminarity and is applied to optimize the electrode design. The laminarity depends not only on conventional design parameters such as the cathode slant angle but also on the spatial distribution of the electric field along the beam trajectory. In the optimized design, the velocity pitch factors, {alpha}, larger than 1.2 are obtained at 65 kV, 10 A with spreads, {Delta}{alpha}, less than 5%.},
doi = {10.1063/1.4768959},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 11,
volume = 19,
place = {United States},
year = {2012},
month = {11}
}