Formation of Laminar Electron Flows for High-Power THz Gyrotrons
| Project/Area Number |
25820138
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Electron device/Electronic equipment
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| Research Institution | University of Fukui |
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Principal Investigator |
YAMAGUCHI YUUSUKE 福井大学, 遠赤外領域開発研究センター, 特命助教 (10466675)
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| Research Collaborator |
TATEMATSU Yoshinori 福井大学, 遠赤外領域開発研究センター, 准教授 (50261756)
SAITO Teruo 福井大学, 遠赤外領域開発研究センター, 教授 (80143163)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | ジャイロトロン / テラヘルツ / マグネトロン入射型電子銃 / ラミナー流 / 多周波数発振 / 協同トムソン散乱 / ポジトロニウム |
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| Outline of Final Research Achievements |
In gyrotrons, formation of a laminar flow is essential to realizing a high-quality electron beam with a small velocity-spread. The electron-optical system was investigated to adjust each electron trajectory in magnetron injection guns (MIGs). it is found that increase in the laminarity is possible with a properly arranged potential profile between the cathode and anode. In the well-laminated beam, the axial pitch of each gyro-motion is modified such that all trajectories have almost the same gyration phase in a plane perpendicular to the magnetic field line.
The above considerations result in the optimum MIG designs for a 300 GHz pulsed tube and a step-frequency-tunable (162 - 265 GHz) tube. The 300 GHz tube showed a maximum power output of 246 kW with an efficiency of 27%, which satisfies the demand on CTS diagnostic in LHD. The step-frequency tunable tube was successfully operated at designed 10 different frequencies with powers of the order of 1 kW.
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Report
(3 results)
Research Products
(28 results)
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[Journal Article] High-power pulsed gyrotron for 300 GHz-band collective Thomson scattering diagnostics in the Large Helical Device2015
Author(s)
Yuusuke Yamaguchi, Teruo Saito, Yoshinori Tatematsu, Shinji Ikeuchi, Vladimir N. Manuilov, Jun Kasa, Masaki Kotera, Toshitaka Idehara, Shin Kubo, Takashi Shimozuma, Kenji Tanaka and Masaki Nishiura
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Journal Title
Nuclear Fusion
Volume: 55
Issue: 1
Pages: 013002-013002
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Development of second harmonic gyrotrons, Gyrotron FU CW GII and Gyrotron FU CW GIII, equipped with internal mode converters2014
Author(s)
Y.Tatematsu, Y.Yamaguchi, T.Idehara, T.Kawase, R.Ichioka, I.Ogawa, T.Saito, T.Fujiwara
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Journal Title
Journal of Infrared, Millimeter, and Terahertz Waves
Volume: 35
Issue: 2
Pages: 169-178
DOI
Related Report
Peer Reviewed
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[Journal Article] Experiment for Over 200 kW Oscillation of a 295 GHz Pulse Gyrotron2013
Author(s)
Y. Yamaguchi, T. Saito, Y. Tatematsu, S. Ikeuchi, J. Kasa, M. Kotera, I. Ogawa, T. Idehara, S. Kubo, T. Shimozuma, M. Nishiura and K. Tanaka
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Journal Title
Plasma and Fusion Research
Volume: 8
Issue: 0
Pages: 1205165-1205165
DOI
NAID
ISSN
1880-6821
Related Report
Peer Reviewed
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[Presentation] Evaluation of Electron Beam Properties in Sub-THz Gyrotron Experiments2014
Author(s)
Y. Yamaguchi, Y. Tatematsu, J. Kasa, K. Terashima, R. Ichioka, T. Kuwahara, M. Kotera, T. Matsui, M. Tanabe, T. Kondo, K. Gunji, V. N. Manuilov and T. Saito
Organizer
Plasma 2014
Place of Presentation
朱鷺メッセ：新潟コンベンションセンター
Year and Date
2014-11-18
Related Report
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[Presentation] High Power Oscillation Experiment of a Prototype Gyrotron for 300 GHz Band Collective Thomson Scattering Diagnostics in LHD2014
Author(s)
Teruo Saito, Yuusuke Yamaguchi, Yoshinori Tatematsu, Jun Kasa, Masaki Kotera, Shinji Ikeuchi, Toshitaka Idehara, Shin Kubo, Takashi Shimozuma, Kenji Tanaka and Masaki Nishiura
Organizer
39th Int. Conf. on Infrared, Millimeter and Terahertz Waves
Place of Presentation
The University of Arizona, Tucson, AZ, USA
Year and Date
2014-09-18
Related Report
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[Presentation] Sub-THz gyrotrons with special functions of frequency control for applications to DNP-NMR spectroscopy2014
Author(s)
T. Idehara, Y. Tatematsu, Y. Yamaguchi, E. Khutoryan, A. Kuleshov, K. Ueda, Y. Matsuki and T. Fujiwara
Organizer
39th Int. Conf. on Infrared, Millimeter and Terahertz Waves
Place of Presentation
The University of Arizona, Tucson, AZ, USA
Year and Date
2014-09-18
Related Report
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[Presentation] Experiment for Over 200 kW Oscillation of a 295 GHz Pulse Gyrotron
Author(s)
Teruo Saito, Yuusuke Yamaguchi, Shinji Ikeuchi, Yoshinori Tatematsu, Ryosuke Ikeda, Isamu Ogawa, Toshitaka Idehara, Shin Kubo, Takashi Shimozuma, Masaki Nishiura, Kenji Tanaka
Organizer
38th International Conference on Infrared, Millimeter and Terahertz Waves
Place of Presentation
Mainz, Germany
Related Report
Invited
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[Presentation] Development of Gyrotron FU CW G-series
Author(s)
Y. Tatematsu, Y. Yamaguchi, T. Kawase, R. Ichioka, T. Muratsubaki, S. Masuta, M. Miwa, T. Idehara, I. Ogawa and T. Saito
Organizer
The 5th International Workshop on Far-Infrared Technologies 2014
Place of Presentation
福井大学
Related Report
Invited
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