Physics study on 3-D equilibrium plasmas with high-speed 2-D imaging diagnostics

• Project/Area Number: 24740368
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Plasma science
• Research Institution: Kyoto Institute of Technology
• Principal Investigator: SANPEI AKIO 京都工芸繊維大学, 工芸科学研究科, 講師 (90379066)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2012: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: 画像計測 / 核燃焼プラズマ / RFP / 磁場閉じ込め / 自己組織化 / MHD緩和 / トロイダルプラズマ

Outline of Final Research Achievements

We have developed an soft X-ray (SXR) imaging diagnostic system that uses multiple pin-hole SXR cameras together with high-speed cameras to record the time evolution of the SXR images from the tangential and vertical directions simultaneously for studying the dynamic structures of 3-D SXR emissivity in low-A reversed field pinch (RFP). By calculating the magnetic topology using equilibrium reconstruction, field line tracing and Computed Tomography from obtained experimental images during a single mode dominant phase, we identify the helically deformed nested flux surfaces.
We have also developed a 2-D electron temperature diagnostic system, which consists of a SXR camera with two pin holes for two-kinds of absorber foils, combined with a high-speed camera. We have succeeded in distinguishing electron temperature image in quasi-single helicity from that in multi-helicity RFP states.

Research Products

• [Journal Article] Effect on Plasma Performance of a Single MHD Mode Feedback Control in Low-Aspect-Ratio RFP RELAX (2014)
  • Author(s): Hiroyuki TANAKA, Sadao Masamune, Seiya Nakaki, Akio Sanpei, Kanae Nishimura, Ryosuke Kodera, Ryota Ueba, Go Ishii, Himura Himura, Roberto Paccagnella
  • Journal Title: Plasma and Fusion Research Volume: 9 Issue: 0 Pages: 1302057-1302057
  • DOI: 10.1585/pfr.9.1302057
  • NAID: 130005088376
  • ISSN: 1880-6821
  • Peer Reviewed / Open Access
• [Journal Article] Reconstruction of the Eddy Current Profile on the Vacuum Vessel in a Fusion Device using only External Magnetic Sensor Signals (2014)
  • Author(s): Masafumi Itagaki, Akio Sanpei, Sadao Masamune, Kiyomasa Watanabe
  • Journal Title: WIT Transactions on Modelling and Simulation Volume: 57 Pages: 149-162
  • DOI: 10.2495/be370131
  • Peer Reviewed
• [Journal Article] A Prototype Diagnostics System to Detect Ultraviolet Emission for Plasma Turbulence (2014)
  • Author(s): T. Onchi, A. Fujisawa, A. Sanpei
  • Journal Title: Rev. Sci. Instrum. Volume: 85 Issue: 11
  • DOI: 10.1063/1.4900660
  • Peer Reviewed / Open Access
• [Journal Article] Electron Temperature Measurement by Thomson Scattering in a Low-Aspect-Ratio RFP RELAX (2014)
  • Author(s): Ryota UEBA, Sadao MASAMUNE, Akio SANPEI, Kosuke UCHIYAMA, Hiroyuki TANAKA, Kanae NISHIMURA, Go ISHII, Ryosuke KODERA, Haruhiko HIMURA, Daniel J. Den HARTOG, Haruhisa KOGUCHI
  • Journal Title: Plasma and Fusion Research Volume: 9 Issue: 0 Pages: 1302009-1302009
  • DOI: 10.1585/pfr.9.1302009
  • NAID: 130004678541
  • ISSN: 1880-6821
  • Peer Reviewed
• [Journal Article] 2D electron temperature diagnostic using soft x-ray imaging technique (2014)
  • Author(s): Kanae Nishimura, Akio Sanpei, Hiroyuki Tanaka, Go Ishii, Ryosuke Kodera, Ryouta Ueba, Haruhiko Himura, Sadao Masamune, Satoshi Ohdachi and Naoki Mizuguchi
  • Journal Title: Rev. Sci. Instrum. Volume: 85 Issue: 3
  • DOI: 10.1063/1.4867076
  • Peer Reviewed
• [Journal Article] Measurement and Evaluation of 3-D Structure in Low-Aspect-Ratio RFP RELAX with Dual SXR Imaging System (2014)
  • Author(s): Akio Sanpei, Kanae Nishimura, Sadao Masamune, Hiroyuki Tanaka, Haruhiko Himura, Satoshi Ohdachi, Naoki Mizuguchi, Tsuyoshi Akiyama
  • Journal Title: JPS Conf. Proc. Volume: 1
  • DOI: 10.7566/jpscp.1.015027
  • Peer Reviewed
• [Journal Article] Reconstruction of the Eddy Current Distribution on the Vacuum Vessel in a Reversed Field Pinch Device based on the External Magnetic Sensor Signals (2014)
  • Author(s): (1)M. Itagaki, A. Sanpei, S. Masamune and K. Watanabe,
  • Journal Title: Plasma and Fusion Research Volume: 9 Issue: 0 Pages: 1402046-1402046
  • DOI: 10.1585/pfr.9.1402046
  • NAID: 130005088370
  • ISSN: 1880-6821
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Dependence of Properties of Quasi-Single-Helicity States on Field Reversal Parameter in a Low-Aspect-Ratio Reversed Field Pinch (2013)
  • Author(s): Kensuke Oki, Akio Sanpei, Haruhiko Himura, Sadao Masamune
  • Journal Title: Fusion Science and Technology Volume: 63 Pages: 386-388
  • Peer Reviewed
• [Journal Article] Asymmetric toroidal flux generation due to phase locking of internally resonant tearing modes in the RELAX reversed-field pinch (2013)
  • Author(s): R. Ikezoe, S. Masamune, K. Oki, A. Sanpei, H. Himura, T. Onchi, A. Hirose
  • Journal Title: Plasma Phys. Control. Fusion Volume: 15005 Issue: 1 Pages: 55-55
  • DOI: 10.1088/0741-3335/55/1/015005
  • Peer Reviewed
• [Journal Article] Design and Initial Result of Time-Resolved Vertical Soft X-Ray Imaging System in Low-<i>A </i>RFP (2012)
  • Author(s): A. Sanpei, K. Oki, D. Fukahori, K. Deguchi, S. Nakaki, K. Nishimura, H. Himura, S. Masamune, S. Ohdachi, N. Nishino, T. Onchi
  • Journal Title: Plasma and Fusion Research Volume: 7 Issue: 0 Pages: 2402052-2402052
  • DOI: 10.1585/pfr.7.2402052
  • NAID: 130003366263
  • ISSN: 1880-6821
  • Peer Reviewed
• [Journal Article] Characterization of Quasi-Single-Helicity States in a Low-Aspect-Ratio RFP (2012)
  • Author(s): K. Oki, D. Fukahori, K. Deguchi, S. Nakaki, A. Sanpei, H. Himura, S. Masamune, R. Paccagnella
  • Journal Title: Plasma and Fusion Research Volume: 7 Issue: 0 Pages: 1402028-1402028
  • DOI: 10.1585/pfr.7.1402028
  • NAID: 130003366233
  • ISSN: 1880-6821
  • Peer Reviewed
• [Journal Article] Modeling of Formation of Helical Structures in Reversed-Field Pinch (2012)
  • Author(s): N. Mizuguchi, A. Sanpei, S. Fujita, K. Oki, H. Himura, S. Masamune, and K. Ichiguchi
  • Journal Title: Plasma and Fusion Research Volume: 7 Issue: 0 Pages: 2403117-2403117
  • DOI: 10.1585/pfr.7.2403117
  • NAID: 130004467832
  • ISSN: 1880-6821
  • Peer Reviewed
• [Journal Article] Phase Locking and Unlocking Associated with Transition to Quasi-Single Helicity State in RELAX Reversed Field Pinch (2012)
  • Author(s): R. Ikezoe, S. Masamune, K. Oki, A. Sanpei, H. Himura, T. Onchi, A. Hirose
  • Journal Title: J. Phys. Soc. Jpn Volume: No.11 Issue: 11 Pages: 81-81
  • DOI: 10.1143/jpsj.81.115001
  • NAID: 210000109809
  • Peer Reviewed
• [Presentation] 非中性プラズマとRFPプラズマにおける乱流と構造形成 (2015)
  • Author(s): 三瓶明希夫
  • Organizer: 「波動粒子相互作用による粒子加速・輸送及び乱流」研究会
  • Place of Presentation: 名古屋大学
  • Year and Date: 2015-03-05 – 2015-03-06
• [Presentation] RFPプラズマのヘリカル構造変化とMHD不安定性 (2014)
  • Author(s): 三瓶明希夫
  • Organizer: 平成26年度NIFS共同研究会「MHDと流体力学における共鳴・分岐・構造形成の理論・シミュレーション研究」
  • Place of Presentation: 核融合科学研究所
  • Year and Date: 2014-12-25 – 2014-12-26
• [Presentation] 軟X線イメージングを用いた低アスペクト比RFPにおける三次元構造時間発展の計測 (2014)
  • Author(s): 三瓶明希夫
  • Organizer: PLASMA2014
  • Place of Presentation: 新潟
  • Year and Date: 2014-11-18 – 2014-11-21
• [Presentation] Properties of the equilibrium and the eddy current distribution in the vacuum vessel in a low-aspect-ratio RFP RELAX (2014)
  • Author(s): Akio Sanpei
  • Organizer: 19th Workshop on MHD Stability Control
  • Place of Presentation: Auburn, USA
  • Year and Date: 2014-11-03 – 2014-11-05
  • Invited
• [Presentation] Evaluation of time evolution of 3-D Structure in RELAX RFP with SXR Imaging Technique (2014)
  • Author(s): Akio Sanpei
  • Organizer: 56th Annual meeting of APS-DPP
  • Place of Presentation: New Orleands, LA, USA
  • Year and Date: 2014-10-27 – 2014-10-31
• [Presentation] Evaluation of time evolution of 3-D Structure in Low-Aspect-Ratio RFP RELAX with SXR Imaging Technique (2014)
  • Author(s): Akio Sanpei
  • Organizer: Workshop on Exploratory Topics in Plasma and Fusion Research (EPR) and US-Japan Compact Torus (CT) Workshop
  • Place of Presentation: Madison, WI, USA
  • Year and Date: 2014-08-05 – 2014-08-08
• [Presentation] MHD mode dynamics on the formation of helical structures in low aspect ratio Reversed Field Pinch plasmas (2014)
  • Author(s): Akio Sanpei
  • Organizer: US-Japan JIFT Workshop on “Recent studies of extended MHD and MHD simulations”
  • Place of Presentation: Kyoto
  • Year and Date: 2014-06-05 – 2014-06-06
• [Presentation] 非中性プラズマとRFPプラズマにおける自己組織化現象の画像計測 (2014)
  • Author(s): 三瓶明希夫
  • Organizer: 2013年度第2回研究会「微粒子・自己組織化プラズマの計測と解析・制御」
  • Place of Presentation: 京都工芸繊維大学
• [Presentation] Measurement and Evaluation of 3-D Structure in Low-Aspect-Ratio RFP RELAX with Dual SXR Imaging System (2013)
  • Author(s): Akio Sanpei
  • Organizer: 12th Asia Pacific Physics Conference
  • Place of Presentation: 幕張メッセ
• [Presentation] 球状RFPプラズマにおける画像計測 (2013)
  • Author(s): 三瓶明希夫，西村香苗，田中裕之，石井豪，上羽涼太，小寺良典，比村治彦，政宗貞男，大舘暁，水口直紀，秋山毅志
  • Organizer: 核融合科学研究所平成25年度一般共同研究「画像計測研究会2013」
  • Place of Presentation: 核融合科学研究所
• [Presentation] Characterization of low-A RFP configuration in RELAX with SXR Imaging Technique (2013)
  • Author(s): Akio Sanpei, Sadao Masamune, Hiroyuki Tanaka, Kanae Nishimura, Go Ishii, Ryosuke Kodera, Ryota Ueba, Haruhiko Himura, Satoshi Ohdachi, Naoki Mizuguchi, Tsuyoshi Akiyama
  • Organizer: Joint 19th ISHW and 16th IEA-RFP workshop
  • Place of Presentation: Padova, Italy
• [Presentation] 3D MHD simulation studies on the formation of helical structures in low aspect ratio Reversed Field Pinch plasmas (2013)
  • Author(s): Akio Sanpei, Naoki Mizuguchi, Sadao Masamune
  • Organizer: US-Japan JIFT Workshop on “Recent studies of extended MHD and MHD simulations”
  • Place of Presentation: Denver, USA
• [Presentation] RELAXにおける球状RFPプラズマ研究の現状と今後の展開 (2013)
  • Author(s): 三瓶明希夫
  • Organizer: 第30回プラズマ・核融合学会年会
  • Place of Presentation: 東工大
• [Presentation] イメージングを用いた球状RFP装置RELAXにおける三次元構造計測 (2013)
  • Author(s): 三瓶明希夫
  • Organizer: 平成25年度核融合科学研究所共同研究研究会「革新的高ベータ閉じ込め配位の先進制御と高性能化」
  • Place of Presentation: 核融合科学研究所
• [Presentation] 逆磁場ピンチの内部構造変化におけるMHD不安定性の役割 (2013)
  • Author(s): 三瓶明希夫
  • Organizer: 第16回若手科学者によるプラズマ研究会
  • Place of Presentation: 日本原子力研究開発機構那珂核融合研究所
• [Presentation] RFPの内部構造変化におけるMHD不安定性の役割 (2013)
  • Author(s): 三瓶明希夫
  • Organizer: 日本物理学会第68回年次大会
  • Place of Presentation: 広島大学
• [Presentation] 軟X線イメージングによる低アスペクト比RFPの三次元構造の評価 (2012)
  • Author(s): 三瓶明希夫
  • Organizer: 物理学会2012年秋季大会
  • Place of Presentation: 横浜国立大学
• [Presentation] Evaluation of 3D Structure in RELAX RFP with SXR Imaging Technique (2012)
  • Author(s): Akio Sanpei
  • Organizer: 54th Annual Meeting of the APS-DPP
  • Place of Presentation: Providence RI
• [Presentation] Mode control with external fields in the low- aspect-ratio RFP (2012)
  • Author(s): Akio Sanpei
  • Organizer: 17TH WORKSHOP ON MHD STABILITY CONTROL
  • Place of Presentation: Columbia University, New York
  • Invited
• [Presentation] 軟X線イメージングを用いた低アスペクト比RFPにおける三次元構造の計測と評価 (2012)
  • Author(s): 三瓶明希夫
  • Organizer: 平成24年度核融合科学研究所共同研究研究会「高ベータプラズマにおける自発的フローと三次元構造の形成」
  • Place of Presentation: 核融合科学研究所
• [Presentation] Evaluation of 3-D Structure in low-aspect-ratio RFP RELAX (2012)
  • Author(s): Akio Sanpei
  • Organizer: 22nd International Toki Conference
  • Place of Presentation: Toki
• [Presentation] 軟X線イメージングを用いた低アスペクト比RFPにおける三次元構造の計測と評価 (2012)
  • Author(s): 三瓶明希夫
  • Organizer: 第29回プラズマ・核融合学会年会
  • Place of Presentation: 福岡県春日市
• [Remarks] プラズマ基礎工学研究室 webページ
  • URL: http://nuclear.es.kit.ac.jp
• [Remarks] プラズマ基礎工学研究室 ウェブページ
  • URL: http://nuclear.es.kit.ac.jp/
• [Remarks] プラズマ基礎工学研究室 ウェブページ
  • URL: http://nuclear.es.kit.ac.jp/