Development of radial electric field measurement at edge transport barrier using advanced Doppler reflectometer

• Project/Area Number: 18686076
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Nuclear fusion studies
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: OYAMA Naoyuki Japan Atomic Energy Agency, 核融合研究開発部門, 研究副主幹 (80354596)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥15,210,000 (Direct Cost: ¥11,700,000、Indirect Cost: ¥3,510,000); Fiscal Year 2008: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2007: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000); Fiscal Year 2006: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
• Keywords: プラズマ閉じ込め / 安定性 / 反射計 / ELM / 輸送障壁 / 径電場 / プラズマ・核融合 / プラズマ診断

Research Abstract

2台の高速掃引型シンセサイザを用いた先進ドップラー反射計を開発し、径電場分布計測と密度揺動径方向相関計測に適用した。径電場分布計測では、電場形成と密接に繋がっているプラズマ回転を変化させた時の径電場分布の変化を観測した。また、密度揺動の相関計測では、内部輸送障壁に電子サイクロトロン共鳴加熱を行った際、イオン温度分布の急峻な勾配が劣化する場合に密度揺動の長距離相関長が増加することを初めて明らかにした。

Research Products

• [Journal Article] Characteristics of Internal Transport Barrier under Reactor Relevant Condition in JT-60U Weak Shear Plasmas (2009)
  • Author(s): H. Takenaga, N. Oyama, H. Urano, 他15名
  • Journal Title: Nuclear Fusion 49
  • Peer Reviewed
• [Journal Article] Long-pulse hybrid scenario development in JT-60U (2009)
  • Author(s): N. Oyama, A. Isayama, G. Matsunaga, 他7名
  • Journal Title: Nuclear Fusion 49
  • Peer Reviewed
• [Journal Article] Progress and issues in understanding the physics of ELM dynamics, ELM mitigation, and ELM control (2008)
  • Author(s): N. Oyama
  • Journal Title: Journal of Physics : Conference Series 123
  • Peer Reviewed
• [Journal Article] Progress and issues in understanding the physics of ELM dynamics, ELM mitieation. and ELM control (2008)
  • Author(s): N. Oyama
  • Journal Title: Journal of Physics: Conference Series 123
  • Peer Reviewed
• [Journal Article] Improved performance in long-pulse ELMy H-mode plasmas with internal transport barrier in JT-60U (2007)
  • Author(s): N. Oyama, A. Isayama, T. Suzuki, 他15名
  • Journal Title: Nuclear Fusion 47 Pages: 689-697
  • Peer Reviewed
• [Journal Article] ELM frequency dependence on toroidal rotation in the grassy ELM regime in JT-60U (2007)
  • Author(s): N. Oyama, Y. Kamada, A. Isayama, 他6名
  • Journal Title: Plasma Physics and Controlled Fusion 49 Pages: 249-259
  • Peer Reviewed
• [Journal Article] Improved performance in long-pulse ELMy H-mode plasmas with internal transport barrier in JT-60U (2007)
  • Author(s): N. Oyama
  • Journal Title: Nuclear Fusion 47 Pages: 689-697
  • Peer Reviewed
• [Journal Article] ELM frequency dependence on toroidal rotation in the grassy ELM regime in JT-60U (2007)
  • Author(s): N.Oyama
  • Journal Title: Plasma Phys. Control. Fusion 49 Pages: 249-259
• [Presentation] JT-60U におけるドップラー反射計を用いた密度揺動計測 (2008)
  • Author(s): 大山直幸
  • Organizer: プラズマ・核融合学会 第25回年会
  • Place of Presentation: 栃木県総合文化センター
  • Year and Date: 2008-12-03
• [Presentation] JT-60Uにおけるドップラー反射計を用いた密度揺動計測 (2008)
  • Author(s): 大山 直幸
  • Organizer: プラズマ・核融合学会第25回年会
  • Place of Presentation: 栃木県総合文化センター
  • Year and Date: 2008-12-03
• [Presentation] ドップラー反射計の開発とJT-60U における密度揺動計測 (2007)
  • Author(s): 大山直幸
  • Organizer: プラズマ・核融合学会 第24回年会
  • Place of Presentation: イーグレ姫路
  • Year and Date: 2007-11-29
• [Presentation] ドップラー反射計の開発とJT-60Uにおける密度揺動計測 (2007)
  • Author(s): 大山 直幸
  • Organizer: プラズマ・核融合学会 第24回年会
  • Place of Presentation: イーグル姫路
  • Year and Date: 2007-11-29
• [Presentation] Doppler reflectometer system using synchronized broadband synthesizers for JT-60U (2007)
  • Author(s): N. Oyama
  • Organizer: 8th International Reflectometer Workshop
  • Place of Presentation: St. -Petersburg, Russia
  • Year and Date: 2007-05-04