Development of equilibrium control technic for the spherical tokamak plasmas from initial phases to steady state phase

• Project/Area Number: 24760699
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Nuclear fusion studies
• Research Institution: Kyushu University
• Principal Investigator: HASEGAWA Makoto 九州大学, 応用力学研究所, 助教 (00325482)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: 球状トカマク / 平衡制御 / 定常運転 / プラズマ画像 / Machine Vision / プラズマ制御 / リアルタイム制御 / プラズマ定常維持 / 画像計測 / プラズマ形状同定 / 画像制御

Research Abstract

The purpose of this task is to develop the technic to identify and control plasma position and its shape on spherical tokamaks. In order to identify them, the magnetic signals are generally used. Since these signals are calculated with integration, errors called as drift errors are piled up in the long time plasma discharge. Thus, the idea is to acquire the images of plasma with visible lights, soft x-ray, and so on, and the plasma position is identified with the image in real-time. From this position, magnetic signals are estimated and errors are corrected. In this task, the operation test is done with a flashlight instead of plasma, and the good position detection and its drift error correction are confirmed. Furthermore, the real-time equilibrium calculation code is developed.

Research Products

• [Journal Article] Development of plasma control system for divertor configuration on QUEST (2013)
  • Author(s): M. Hasegawa, K. Nakamura, H. Zushi, K. Hanada, A. Fujisawa, K. Matsuoka, O. Mitarai, H. Idei, Y. Nagashima, K. Tokunaga, S. Kawasaki, H. Nakashima, A. Higashijima
  • Journal Title: Fusion Engineering and Design Volume: 88 Issue: 6-8 Pages: 1074-1077
  • DOI: 10.1016/j.fusengdes.2013.03.035
  • Peer Reviewed
• [Journal Article] A Plasma Shape Identification with Magnetic Analysis for the Real-time Control on QUEST (2012)
  • Author(s): Makoto Hasegawa, Kazuo Nakamura, Kazutoshi Tokunaga, Hideki Zushi, Kazuaki Hanada, Akihide Fujisawa, Hiroshi Idei, Shoji Kawasaki, Hisatoshi Nakashima, Aki Higashijima
  • Journal Title: IEEJ Transactions on Fundamentals and Materials Volume: 132 Issue: 7 Pages: 477-484
  • DOI: 10.1541/ieejfms.132.477
  • NAID: 10030777753
  • ISSN: 0385-4205, 1347-5533
  • Peer Reviewed
• [Presentation] Development of plasma control system for steady state operation on QUEST (2013)
  • Author(s): Makoto Hasegawa, Kazuo Nakamura, Hideki Zushi, Kazuaki Hanada, Akihide Fujisawa, Keisuke Matsuoka, Hiroshi Idei, Yoshihiko Nagashima, Kazutoshi Tokunaga, Shoji Kawasaki, Hisatoshi Nakashima, Aki Higashijima
  • Organizer: 9th Asia Plasma and Fusion Association Conference
  • Place of Presentation: Gyeongju Hilton Hotel, Gyeongju City, Korea
  • Year and Date: 2013-11-05
• [Presentation] Development of plasma control system for steady state operation on QUEST (2013)
  • Author(s): M. Hasegawa, K. Nakamura, H. Zushi, K. Hanada, A. Fujisawa, K. Matsuoka, H. Idei, Y. Nagashima, K. Tokunaga, S. Kawasaki, H. Nakashima, and A. Higashijima
  • Organizer: 9th Asia Plasma and Fusion Association Conference (APFA 2013)
  • Place of Presentation: Gyeongju City, Korea
• [Presentation] Development of plasma control system for divertor configuration on QUEST (2012)
  • Author(s): M. Hasegawa
  • Organizer: 27th Symposium on Fusion Technology
  • Place of Presentation: Liege, Belgium