壁排気特性における臨界入射束の役割と同位体効果の解明

• Project/Area Number: 20049004
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Kyushu University
• Principal Investigator: 図子 秀樹 Kyushu University, 応用力学研究所, 教授 (20127096)
• Project Period (FY): 2008 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥2,000,000 (Direct Cost: ¥2,000,000); Fiscal Year 2009: ¥1,000,000 (Direct Cost: ¥1,000,000); Fiscal Year 2008: ¥1,000,000 (Direct Cost: ¥1,000,000)
• Keywords: リサイクリング / 透過束 / 再結合束 / 透過計測 / 壁排気

Research Abstract

研究概要
壁排気と壁放出の支配因子の発見がリサイクリングD/T燃料比を制御する事につながるとの認識から以下のような研究を推進する。準備研究で見いだした"臨界入射束"の役割を明らかにするために、透過束、入射束、再堆積膜厚を同時計測する。特に"壁排気"特性のdynamicsを調べ、臨界入射束に占めるイオン束/中性粒子束の割合さらにはそれらのエネルギー付与の割合を明らかにする。さらに、H/D混合プラズマを用いたトカマク実験により、壁排気特性の同位体効果を明らかにする。
21年度成果
広範な実験条件下で透過束計測を実施し、1)Niメンブレムの温度変化に対応する透過束の観測から物性値を評価、2)表面条件を考慮した拡散方程式の解と観測値の比較から入射束ならびに再結合束の評価に成功した。こうしたモデリングと観測から、長期にわたる壁状態の評価を行うことができた。

Research Products

• [Journal Article] Analysis of the footprint traces on first walls of the compact plasma wall interaction device CPD using surface analysis and electron orbit calculations (2010)
  • Author(s): S.K.Sharma, H.Zushi
  • Journal Title: Nuclear. Fusion 50
  • Peer Reviewed
• [Journal Article] Hard X-ray measurement during the current startup phase in QUEST (2010)
  • Author(s): S.Tashima
  • Journal Title: Jouranal of Plasma and Fusion Resesrch Series. (掲載受理)
  • Peer Reviewed
• [Journal Article] Active Particle Control Experiments and Critical Particle Flux Discriminating between the Wall Pumping and Fueling in the Compact Plasma wall interaction Device CPD Spherical Tokamak (2009)
  • Author(s): H.Zushi
  • Journal Title: Nuclear. Fusion 49
  • Peer Reviewed
• [Journal Article] Two Dimensional Density Fluctuation Measurements During the Non-Inductive Current Ramp-up Phase in the Compact Plasma Wall Interaction Experimental Device CPD (2009)
  • Author(s): H.Zushi
  • Journal Title: Plasma Science and Technology 11 Pages: 397-401
  • Peer Reviewed
• [Journal Article] Active Particle Control Experiments and Critical Particle Flux Discriminating between the Wall Pumping and Fueling in the Compact Plasma wall interaction Device CPD Spherical Tokamak (2009)
  • Author(s): H.Zushi, et al.
  • Journal Title: Nuclear Fusion 49 Pages: 55020-55029
  • Peer Reviewed
• [Journal Article] Dynamic response of hydrogen reemission and retention from and in inert gas sprayed tungsten exposed to ECR plasma (2009)
  • Author(s): H.Zushi, et al.
  • Journal Title: Fusion Science Technology 55 Pages: 9-14
  • Peer Reviewed
• [Journal Article] Surface temperature effects on the retention and pressure variation in continuous and cyclic plasma exposures on the tungsten (2009)
  • Author(s): Okamoto, H.Zushi
  • Journal Title: Journal of Nuclear Materials 390-391 Pages: 671-676
  • Peer Reviewed
• [Journal Article] プラズマ中のトリチウム挙動を知る (2009)
  • Author(s): H.Zushi
  • Journal Title: Plasma Fusion Res 85 Pages: 3-12
  • NAID: 110007047412
  • Peer Reviewed
• [Presentation] Measurement of the Plasma Driven Permeation Flux in the Spherical Tokamak QUEST (2009)
  • Author(s): S.K.Sharma, H.Zushi
  • Organizer: International Spherical Torus Workshop 2009
  • Place of Presentation: U.S.A. University of Wisconsin
  • Year and Date: 2009-10-23
• [Presentation] Study of the plasma driven permeation of hydrogen through a nickel membrane in RF and ohmic plasmas in the spherical tokamak QUEST (2009)
  • Author(s): S.K.Sharma, H.Zushi
  • Organizer: 7th General Scientific Assembly of the Asia Plasma and Fusion Association (APFA09)
  • Place of Presentation: Aomori
• [Presentation] QUESTにおける壁状態の実時間計測(PDP計測から) (2009)
  • Author(s): 図子秀樹
  • Organizer: プラズマ・核融合学会
  • Place of Presentation: 京都
• [Presentation] QUESTにおける水素プラズマ誘起透過束測定 (2009)
  • Author(s): 久野祐基,図子秀樹
  • Organizer: プラズマ・核融合学会
  • Place of Presentation: 京都
• [Presentation] QUEST装置でのプラズマ実験立ち上げ期のガス特性 (2009)
  • Author(s): 図子秀樹
  • Organizer: 日本物理学会
  • Place of Presentation: 立教大学
• [Presentation] Study of the footprint patterns on the CPD walls using electron orbit calculatiions and surface analysis (2009)
  • Author(s): S.K.Sharma、図子秀樹
  • Organizer: 日本物理学会
  • Place of Presentation: 立教大学
• [Presentation] 壁排気-放出特性遷移におよぼす表面温度、人射束、放電duty依存性 (2008)
  • Author(s): 図子秀樹
  • Organizer: プラズマ核融合学会
  • Place of Presentation: 宇都宮
• [Presentation] 球状トカマク装置QUESTにおける水素プラズマ誘起透過束測定について (2008)
  • Author(s): 久野祐基、図子秀樹
  • Organizer: プラズマ核融合学会支部会
  • Place of Presentation: 九大