Study of millimeter wave breakdown and control method

2009 Fiscal Year Final Research Report

• Project/Area Number: 20860093
• Research Category: Grant-in-Aid for Young Scientists (Start-up)
• Allocation Type: Single-year Grants
• Research Field: Nuclear fusion studies
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: ODA Yasuhisa Japan Atomic Energy Agency, 核融合研究開発部門, 博士研究員 (60512209)
• Project Period (FY): 2008 – 2009
• Keywords: ミリ波 / 空気プラズマ / ジャイロトロン

Research Abstract

The structure formation of atmospheric millimeter wave breakdown plasma was observed. The atmospheric millimeter-wave breakdown was observed under various beam profiles. Several profiles were produced from a high-power 170GHz gyrotron beam using the beam mode converter. The breakdown plasma had unique structure depending on each beam profile. The structure was determined by the trajectory of ionization spots depending on beam profile. The breakdown threshold under various gas species condition was also observed.

Research Products

• [Journal Article] Measurement of RF transmission mode in ITER relevant EC H&CD transmission line (2010)
  • Author(s): Y. Oda, K. Kajiwara, K. Takahashi, A. Kasugai, M. Shapiro, R.J. Temkin, K. Sakamoto
  • Journal Title: Journal of Infrared, Millimeter, and Terahertz Waves (掲載決定)
  • Peer Reviewed
• [Journal Article] In Tube Shock Wave Driven by Atmospheric Millimeter-Wave Plasma (2009)
  • Author(s): Y. Oda, K. Kajiwara, K. Takahashi, A. Kasugai, K. Sakamoto, K. Komurasaki
  • Journal Title: Japanese Journal or Applied Physics 48 Pages: 116001
  • Peer Reviewed
• [Journal Article] マイクロ波による気中放電のダイナミックスと構造形成 (2008)
  • Author(s): 小田靖久, 小紫公也, 坂本慶司
  • Journal Title: プラズマ核融合学会誌 84 Pages: 343-347
• [Presentation] Visualization of Shock Wave Driven by Millimeter Wave Plasma in a Parabolic Thruster (2009)
  • Author(s): T. Yamaguchi, Y. Oda, Y. Shimada, Y. Shiraishi, T. Shibata, K. Komurasaki, K. Kajiwara, K. Takahashi, A. Kasugai, K. Sakamoto, Y. Arakawa
  • Organizer: 6th International Symposium on Beamed Energy Propulsion
  • Place of Presentation: Scottsdale, USA
  • Year and Date: 20091100
• [Presentation] Structure Formation of Atmospheric Millimeter Wave Breakdown on Non-Gaussian Beam (2009)
  • Author(s): Y. Oda, T. Yamaguchi, K. Kajiwara, K. Takahashi, A. Kasugai, K. Komurasaki, K. Sakamoto
  • Organizer: The 34th International Conference on Infrared, Millimeter, and Terahertz Waves
  • Place of Presentation: Busan, Korea
  • Year and Date: 20090900
• [Presentation] Shock wave generation by atmospheric breakdown plasma on a high power millimeter wave beam (2009)
  • Author(s): Y. Oda, K. Kajiwara, K. Takahashi, A. Kasugai, K. Sakamoto, T. Yamaguchi, K. Komurasaki
  • Organizer: 4th International Congress on Cold Atmospheric Pressure Plasmas: Sources and Applications
  • Place of Presentation: Ghent, Belgium
  • Year and Date: 20090600
• [Presentation] 大電力ミリ波ビームにおけるRF窓表面での放電 (2009)
  • Author(s): 小田靖久, 梶原健, 高橋幸司, 春日井敦, 坂本慶司
  • Organizer: プラズマ科学シンポジウム2009
  • Place of Presentation: 名古屋
  • Year and Date: 20090200
• [Presentation] A structure of breakdown plasma by a high power millimeter wave beam (2008)
  • Author(s): Y. Oda, K. Kajiwara, K. Takahashi, A. Kasugai, K. Sakamoto, K. Komurasaki
  • Organizer: International Congress on Plasma Physics 2008
  • Place of Presentation: Fukuoka, Japan
  • Year and Date: 20080900