Performance evaluation of electron beams and structure optimization of thermionic-cathodes in THz gyrotrons

• Project/Area Number: 15K21030
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Plasma science; Electron device/Electronic equipment
• Research Institution: University of Fukui
• 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)
• 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)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000); Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• 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 / 含浸カソード / 熱絶縁

Outline of Final Research Achievements

The magnetron-injection-guns (MIGs) are a critical component of gyrotrons which are operated in the THz range of frequencies. The emitter is made of porous tungsten impregnated with barium compounds. There are small gaps in order to thermally isolate the emitter from the other elements of the cathode. In this study, two kinds of MIG cathodes with different gap position arrangements were fabricated in order to investigate the effect of those gaps on electron beam characteristics. Each cathode was installed and tested in a 0.2-THz gyrotron. The oscillation characteristics associated with the electron beam properties were evaluated by comparing the observed results and the numerical ones. Although the substantial decreases in the electron beam quality and the output power were numerically predicted in case of the thermal insulation gaps close to the emitter, the reductions were small under the optimized experimental conditions.

Research Products

• [Journal Article] Development of 300 GHz Band Gyrotron for Collective Thomson Scattering Diagnostics in the Large Helical Device (2017)
  • Author(s): Teruo SAITO, Yuusuke YAMAGUCHI, Yoshinori TATEMATSU, Masafumi FUKUNARI, Takumi HIROBE, Shunsuke TANAKA, Ryuji SHINBAYASHI, Takashi SHIMOZUMA, Shin KUBO, Kenji TANAKA and Masaki NISHIURA
  • Journal Title: Plasma and Fusion Research Volume: 12 Issue: 0 Pages: 1206013-1206013
  • DOI: 10.1585/pfr.12.1206013
  • NAID: 130006897721
  • ISSN: 1880-6821
  • Peer Reviewed / Open Access
• [Journal Article] Transmission Characteristics of Hybrid Modes in Corrugated Waveguides Above the Bragg Frequency (2017)
  • Author(s): Kunizo Ohkubo, Teruo Saito, Yuusuke Yamaguchi, Yoshinori Tatematsu, Jun Kasa, Shin Kubo, Takashi Shimozuma, Kenji Tanaka, Masaki Nishiura
  • Journal Title: Journal of Infrared, Millimeter, and Terahertz Waves Volume: - Issue: 7 Pages: 1-21
  • DOI: 10.1007/s10762-017-0385-y
  • Peer Reviewed
• [Journal Article] Simultaneous Stabilization of Gyrotron Frequency and Power by PID Double Feedback Control on the Acceleration and Anode Voltages (2017)
  • Author(s): E. M. Khutoryan, T. Idehara, A. N. Kuleshov, Y. Tatematsu, Y. Yamaguchi, Y. Matsuki, T. Fujiwara
  • Journal Title: Journal of Infrared, Millimeter, and Terahertz Waves Volume: - Issue: 7 Pages: 1-11
  • DOI: 10.1007/s10762-017-0374-1
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Influence of the electron velocity spread and the beam width on the efficiency and mode competition in the high-power pulsed gyrotron for 300 GHz band collective Thomson scattering diagnostics in the large helical device (2016)
  • Author(s): O. Dumbrajs, T. Saito, Y. Tatematsu, and Y. Yamaguchi
  • Journal Title: Physics of Plasmas Volume: 23 Issue: 9 Pages: 093109-093109
  • DOI: 10.1063/1.4962575
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] High power 303 GHz gyrotron for CTS in LHD (2015)
  • Author(s): Y. Yamaguchi, J. Kasa, T. Saito, Y. Tatematsu, M. Kotera, S. Kubo, T. Shimozuma, K. Tanaka and M. Nishiura
  • Journal Title: Journal of Instrumentation Volume: 10 Issue: 10 Pages: C10002-C10002
  • DOI: 10.1088/1748-0221/10/10/c10002
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Development of the Multifrequency Gyrotron FU CW GV with Gaussian Beam Output (2015)
  • Author(s): Yoshinori Tatematsu, Yuusuke Yamaguchi, Ryoichi Ichioka, Masaki Kotera, Teruo Saito and Toshitaka Idehara
  • Journal Title: Journal of Infrared, Millimeter, and Terahertz Waves Volume: 36 Issue: 8 Pages: 697-708
  • DOI: 10.1007/s10762-015-0173-5
  • Peer Reviewed
• [Presentation] Development of 303-GHz High Power Pulsed Gyrotron (2017)
  • Author(s): Y. Yamaguchi, T. Saito, Y. Tatematsu, M. Fukunari, T. Hirobe, R. Shinbayashi, S. Tanaka, S. Kubo, T. Shimozuma, K. Tanaka and M. Nishiura
  • Organizer: 6th International Workshop on Far-Infrared Technologies (IW-FIRT 2017)
  • Place of Presentation: University of Fukui, Japan
  • Year and Date: 2017-03-07
  • Int'l Joint Research / Invited
• [Presentation] Development of a 0.3-THz High Power Gyrotron for Use in Fusion Plasma Diagnostics (2017)
  • Author(s): Y. Yamaguchi, T. Saito, Y. Tatematsu, M. Fukunari, T. Hirobe, R. Shinbayashi, S. Tanaka, S. Kubo, T. Shimozum1, K. Tanaka and M. Nishiura
  • Organizer: 1st Philippines-Japan Terahertz Research Workshop (PJTW-2017)
  • Place of Presentation: De La Salle University, Science and Technology Complex, Santa Rosa City, Philippines
  • Year and Date: 2017-02-22
  • Int'l Joint Research / Invited
• [Presentation] LHD における協同トムソン散乱への適用を目指した 300 GHz 帯高出力ジャイロトロンの開発 (2016)
  • Author(s): 斉藤輝雄，山口裕資，立松芳典，福成雅史，廣部匠，田中俊輔，新林竜志，下妻隆，久保伸，田中謙治，西浦正樹，O. Dumbrajs
  • Organizer: プラズマ・核融合学会 2016年 年会
  • Place of Presentation: 東北大学 青葉山キャンパス
  • Year and Date: 2016-12-01
  • Invited
• [Presentation] 高周波ジャイロトロンにおける熱陰極からの不要放出の抑制 (2016)
  • Author(s): 山口裕資，立松芳典，福成雅史，斉藤輝雄
  • Organizer: プラズマ・核融合学会 2016年 年会
  • Place of Presentation: 東北大学 青葉山キャンパス
  • Year and Date: 2016-11-30
• [Presentation] 2 周波数帯-200,400 GHz- 周波数連続可変ジャイロトロンの開発 (2016)
  • Author(s): 立松芳典，山口裕資，小寺政輝，斉藤輝雄
  • Organizer: プラズマ・核融合学会 2016年 年会
  • Place of Presentation: 東北大学 青葉山キャンパス
  • Year and Date: 2016-11-29
• [Presentation] Gyrotron FU CW XA における複数の基本波モード周波数連続可変 (2016)
  • Author(s): 飯澤萌，高山京也，前田悠斗，福成雅史，山口裕資，立松芳典，斉藤輝雄
  • Organizer: 2016年度 日本物理学会 北陸支部 定例学術講演会
  • Place of Presentation: 富山大学 五福キャンパス
  • Year and Date: 2016-11-26
• [Presentation] Gyrotron FU CW XA における二次高調波発振モードの発振特性 (2016)
  • Author(s): 前田悠斗，飯澤萌，高山京也，福成雅史，山口裕資，立松芳典，斉藤輝雄
  • Organizer: 2016年度 日本物理学会 北陸支部 定例学術講演会
  • Place of Presentation: 富山大学 五福キャンパス
  • Year and Date: 2016-11-26
• [Presentation] 二次高調波多周波数ガウスビーム出力ジャイロトロンの実現に向けた二次高調波モード発振実験 (2016)
  • Author(s): 高山京也，飯澤萌，前田悠斗，福成雅史，山口裕資，立松芳典，斉藤輝雄
  • Organizer: 2016年度 日本物理学会 北陸支部 定例学術講演会
  • Place of Presentation: 富山大学 五福キャンパス
  • Year and Date: 2016-11-26
• [Presentation] 300 GHz 帯ジャイロトロン出力のコルゲート導波管伝送実験 (2016)
  • Author(s): 田中俊輔，廣部匠，新林竜志，福成雅史，山口裕資，立松芳典，斉藤輝雄，久保伸，下妻隆，田中謙治，西浦正樹
  • Organizer: 2016年度 日本物理学会 北陸支部 定例学術講演会
  • Place of Presentation: 富山大学 五福キャンパス
  • Year and Date: 2016-11-26
• [Presentation] 300 GHz 帯ジャイロトロン出力のMOUによる軸対称ガウスビーム整形 (2016)
  • Author(s): 新林竜志，廣部匠，田中俊輔，福成雅史，山口裕資，立松芳典，斉藤輝雄，久保伸，下妻隆，田中謙治，西浦正樹
  • Organizer: 2016年度 日本物理学会 北陸支部 定例学術講演会
  • Place of Presentation: 富山大学 五福キャンパス
  • Year and Date: 2016-11-26
• [Presentation] Influence of thermal-insulation structure of thermionic cathode on oscillation efficiency of a sub-THz gyrotron (2016)
  • Author(s): Y. Yamaguchi, Y. Tatematsu and T. Saito
  • Organizer: 41st Int. Conf. on Infrared, Millimeter and Terahertz Waves
  • Place of Presentation: Bella Center, Copenhagen, Denmark
  • Year and Date: 2016-09-29
  • Int'l Joint Research
• [Presentation] High Power Oscillation Test of 300 GHz Band Gyrotron for Practical Use in Collective Thomson Scattering Diagnostics in LHD (2016)
  • Author(s): T. Saito, Y. Yamaguchi, Y. Tatematsu, T. Hirobe, M. Fukunari, J. Kasa, K. Ohkubo, S. Kubo, T. Shimozuma, K. Tanaka, and M. Nishiura
  • Organizer: 41st Int. Conf. on Infrared, Millimeter and Terahertz Waves
  • Place of Presentation: Bella Center, Copenhagen, Denmark
  • Year and Date: 2016-09-29
  • Int'l Joint Research / Invited
• [Presentation] Frequency tunability in both 200 and 400 GHz bands realized in Gyrotrons FU CW GIV and FU CW X (2016)
  • Author(s): Y. Tatematsu, Y. Yamaguchi, M. Kotera and T. Saito
  • Organizer: 41st Int. Conf. on Infrared, Millimeter and Terahertz Waves
  • Place of Presentation: Bella Center, Copenhagen, Denmark
  • Year and Date: 2016-09-29
  • Int'l Joint Research
• [Presentation] Start-up scenario of a high-power pulsed gyrotron for 300 GHz band collective Thomson scattering diagnostics in the Large Helical Device (2016)
  • Author(s): O. Dumbrajs, T. Saito, Y. Tatematsu and Y. Yamaguchi
  • Organizer: 41st Int. Conf. on Infrared, Millimeter and Terahertz Waves
  • Place of Presentation: Bella Center, Copenhagen, Denmark
  • Year and Date: 2016-09-29
  • Int'l Joint Research
• [Presentation] Gyrotron Output Frequency and Power Stabilization by PID Feedback Control on the Acceleration and Anode Voltages (2016)
  • Author(s): E. M. Khutoryan, T. Idehara, A. N. Kuleshov, Y. Tatematsu, Y. Yamaguchi, Y. Matsuki and T. Fujiwara
  • Organizer: 41st Int. Conf. on Infrared, Millimeter and Terahertz Waves
  • Place of Presentation: Bella Center, Copenhagen, Denmark
  • Year and Date: 2016-09-29
  • Int'l Joint Research
• [Presentation] 高周波ジャイロトロンにおける Ba 含浸カソードの熱絶縁と発振特性への影響 (2016)
  • Author(s): 山口裕資，立松芳典，福成雅史，斉藤輝雄
  • Organizer: 日本物理学会 2016年 秋季大会
  • Place of Presentation: 金沢大学 角間キャンパス
  • Year and Date: 2016-09-14
• [Presentation] 300 GHz 帯 CTS 計測用パルスジャイロトロン出力のコルゲート導波管伝送効率評価 (2016)
  • Author(s): 廣部匠，新林竜志，田中俊輔，山口裕資，福成雅史，斉藤輝雄，立松芳典，大久保邦三，久保伸，下妻隆，田中謙治，西浦正樹
  • Organizer: 日本物理学会 2016年 秋季大会
  • Place of Presentation: 金沢大学 角間キャンパス
  • Year and Date: 2016-09-14
• [Presentation] ジャイロトロン制御の自動化へ向けた遠隔操作および監視機器の開発 (2016)
  • Author(s): 山口裕資
  • Organizer: 第三回西日本強磁場科学研究会
  • Place of Presentation: 福井大学
  • Year and Date: 2016-09-12
• [Presentation] Sub-THz 帯ジャイロトロン FU CW GIA におけるエミッタの熱絶縁と発振特性への影響 (2015)
  • Author(s): 辻幸介, 山口裕資, 立松芳典, 平野泰成, 小寺政輝, 斉藤輝雄
  • Organizer: 2015年度 日本物理学会北陸支部 定例学術講演会
  • Place of Presentation: 金沢大学 自然科学5号館
  • Year and Date: 2015-11-28
• [Presentation] LHD における協同トムソン散乱計測のための 300 GHz 帯パルスジャイロトロンの周波数測定 (2015)
  • Author(s): 永宮正敏, 笠純, 廣部匠, 山口裕資, 斎藤輝雄, 立松芳典, 久保伸, 下妻隆, 田中謙治, 西浦正樹
  • Organizer: 2015年度 日本物理学会北陸支部 定例学術講演会
  • Place of Presentation: 金沢大学 自然科学5号館
  • Year and Date: 2015-11-28
• [Presentation] LHD における協同トムソン散乱計測用パルスジャイロトロンの放射パターン解析 (2015)
  • Author(s): 廣部匠, 笠純, 永宮正敏, 山口裕資, 斉藤輝雄, 立松芳典, 久保伸, 下妻隆, 田中謙治, 西浦正樹
  • Organizer: 2015年度 日本物理学会北陸支部 定例学術講演会
  • Place of Presentation: 金沢大学 自然科学5号館
  • Year and Date: 2015-11-28
• [Presentation] 2次高調波多周波数発振ガウスビーム出力ジャイロトロン開発 のための検討 (2015)
  • Author(s): 立松芳典，山口裕資，斉藤輝雄，小寺政輝，笠純，平野泰成， 辻幸介
  • Organizer: プラズマ・核融合学会 第32回年回
  • Place of Presentation: 名古屋大学東山キャンパス・豊田講堂
  • Year and Date: 2015-11-26
• [Presentation] LHD における協同トムソン散乱計測のための300 GHz 帯実機 ジャイロトロンの開発 (2015)
  • Author(s): 笠純，山口裕資，斉藤輝雄，立松芳典，永宮正敏， 小寺政輝，久保伸，下妻隆，田中謙治，西浦正樹
  • Organizer: プラズマ・核融合学会 第32回年回
  • Place of Presentation: 名古屋大学東山キャンパス・豊田講堂
  • Year and Date: 2015-11-25
• [Presentation] 高周波ジャイロトロンにおけるエミッタの熱絶縁と電子ビーム特性への影響 (2015)
  • Author(s): 山口裕資，立松芳典，辻幸介，平野泰成，小寺政輝，笠純，斉藤輝雄
  • Organizer: プラズマ・核融合学会 第32回年回
  • Place of Presentation: 名古屋大学東山キャンパス・豊田講堂
  • Year and Date: 2015-11-24
• [Presentation] High Power 303-GHz Gyrotron for CTS in LHD (2015)
  • Author(s): Y. Yamaguchi, J. Kasa, T. Saito, Y. Tatematsu, M. Kotera, S. Kubo, T. Shimozuma, K. Tanaka and M. Nishiura
  • Organizer: 17th International Symposium on Laser-Aided Plasma Diagnostics (LAPD17)
  • Place of Presentation: Chateraise Gateaux Kingdom Sapporo, Japan
  • Year and Date: 2015-10-01
  • Int'l Joint Research
• [Presentation] Development of a High Power 300 GHz Band Gyrotron for Practical Use in Collective Thomson Scattering Diagnostics in LHD (2015)
  • Author(s): Teruo Saito, Jun Kasa, Yuusuke Yamaguchi, Yoshinori Tatematsu, Masaki Kotera, Shin Kubo, Takashi Shimozuma, Kenji Tanaka, and Masaki Nishiura
  • Organizer: The 40th International Conference on Infrared, Millimeter and Terahertz, Waves (IRMMW-THz 2015)
  • Place of Presentation: The Chinese University of Hong Kong
  • Year and Date: 2015-08-27
  • Int'l Joint Research
• [Presentation] Magnetron Injection Gun for a Multi-Frequency Gyrotron (2015)
  • Author(s): Y. Yamaguchi, Y. Tatematsu, T. Saito, V. N. Manuilov, J. Kasa and M. Kotera
  • Organizer: The 40th International Conference on Infrared, Millimeter and Terahertz, Waves (IRMMW-THz 2015)
  • Place of Presentation: The Chinese University of Hong Kong
  • Year and Date: 2015-08-26
  • Int'l Joint Research
• [Presentation] Advancement of Oscillation Efficiency by Improvement of Electron Beam Quality in Gyrotron FU CW GIA (2015)
  • Author(s): Yoshinori Tatematsu, Yuusuke Yamaguchi, Ryoichi Ichioka, Masaki Kotera, Teruo Saito and Toshitaka Idehara
  • Organizer: The 40th International Conference on Infrared, Millimeter and Terahertz, Waves (IRMMW-THz 2015)
  • Place of Presentation: The Chinese University of Hong Kong
  • Year and Date: 2015-08-25
  • Int'l Joint Research