非接触核融合プラズマモデリングを目指した周辺プラズマ・中性粒子輸送コード開発

2023 Fiscal Year Annual Research Report

• Project/Area Number: 19K03802
• Research Institution: National Institute for Fusion Science
• Principal Investigator: 河村 学思 核融合科学研究所, 研究部, 助教 (70509520)
• Co-Investigator(Kenkyū-buntansha): 田中 宏彦 名古屋大学, 未来材料・システム研究所, 准教授 (60609981) ; 大島 慎介 京都大学, エネルギー理工学研究所, 助教 (00469610) ; 澤田 圭司 信州大学, 学術研究院工学系, 教授 (40262688)
• Project Period (FY): 2019-04-01 – 2024-03-31
• Keywords: 非接触プラズマ / 輸送モデリング / ダイバータ / 磁場閉じ込め核融合

Outline of Annual Research Achievements

前年度に行ったNAGDIS-II装置（名古屋大学）の重水素非接触プラズマ研究を発展させるため，期間を一年延長して重水素非接触プラズマの数値モデリング研究を実施した．プラズマ中でイオンが電子を捕獲して中性原子に戻る体積再結合過程が組み込まれたEMC3-EIRENEコード（Wisconsin大学およびマックスプランクプラズマ物理研究所開発）を用い，同装置の三次元数値輸送計算を行った．イオンが直接電子を捕獲するEIR過程と分子が介在するMAR過程それぞれの反応量の空間分布を調べ，電子温度が2eV程度と比較的高い上流部でMARが，1eVを下回るターゲット前面でEIRが多いこと，そして比較的高密度なプラズマでは主にEIRによってイオン粒子束が低減され，非接触領域が形成されることを示した．実験に類似するガス制御を行い，高ガス圧ほど非接触遷移領域が上流に移動し，非接触領域が広がる結果が得られ，実験を定性的に再現することに成功した．また，学生教育を含めた共同研究を広く行い，Heliotron J装置（京都大学）のダイバータプラズマにおける磁力線構造と不純物輸送の研究，CFQS装置（西南交通大学・核融合研）における熱負荷分布制御を目指したダイバータ板形状の設計手法研究を実施した．
本課題の研究期間全体を通して，ダイバータプラズマの輸送や基礎過程に関する実験および数値モデリング研究を進め，直線装置における安定した重水素放電実験と数値モデリング研究，Heliotron J装置や大型ヘリカル装置における計測と数値モデリングの連携，水素分子の回転振動励起状態を区別した輸送モデルの開発，JT-60SA装置（量研）のRMP三次元ダイバータプラズマ計算など，多岐にわたる研究の進展に貢献するとともに，重要課題である非接触重水素プラズマの三次元数値輸送計算を実現し，中心となる研究目標を十分に達成したと考える．

Research Products

• [Int'l Joint Research] Max-Planck IPP/Forschungszentrum Juelich(ドイツ)
  • Country Name: GERMANY
  • Counterpart Institution: Max-Planck IPP/Forschungszentrum Juelich
• [Int'l Joint Research] University of Wisconsin-Madison(米国)
  • Country Name: U.S.A.
  • Counterpart Institution: University of Wisconsin-Madison
• [Int'l Joint Research] Dalian University Of Technology/Southwest Jiaotong University(中国)
  • Country Name: CHINA
  • Counterpart Institution: Dalian University Of Technology/Southwest Jiaotong University
• [Journal Article] Multiscale numerical study of the ELM-induced sputtering on the tungsten castellated divertor gap (2024)
  • Author(s): Niu Guo-jian、Kawamura Gakushi、Dai Shu-yu、Yang Zhong-shi、Ding Fang、Xu Qian、Wang Rong、He Tao、Luo Guang-Nan
  • Journal Title: Nuclear Fusion Volume: 64 Pages: 026009～026009
  • DOI: 10.1088/1741-4326/ad1533
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Ultrahigh neutral pressures in the sub-divertor of the Large Helical Device (2024)
  • Author(s): Wenzel U.、Motojima G.、Kobayashi M.、Goto M.、Hayashi Y.、Masuzaki S.、Kawamura G.、Jagielski B.、Haak V.
  • Journal Title: Nuclear Fusion Volume: 64 Pages: 034002～034002
  • DOI: 10.1088/1741-4326/ad249f
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Impact of multifold magnetic structure on spectroscopy analysis in Heliotron J based on EMC3‐EIRENE simulation (2024)
  • Author(s): Cai F.、Kado S.、Kawamura G.、Feng C.、Matoike R.、Miyashita A.、Ohshima S.、Minami T.、Inagaki S.、Kin F.、Kobayashi S.、Ishizawa A.、Nakamura Y.、Okada H.、Konoshima S.、Mizuuchi T.、Feng Y.、Frerichs H.、Nagasaki K.
  • Journal Title: Contributions to Plasma Physics Volume: - Pages: in press
  • DOI: 10.1002/ctpp.202300145
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Four-dimensional conditional averaging tomography of rotating plasma ejection from cylindrical detached plasma (2024)
  • Author(s): Tanaka Hirohiko、Kajita Shin、Natsume Hiroki、Ohno Noriyasu
  • Journal Title: Scientific Reports Volume: 14 Pages: 9329
  • DOI: 10.1038/s41598-024-59182-5
  • Peer Reviewed / Open Access
• [Journal Article] EUV/VUV Spectroscopy for the Study of Carbon Impurity Transport in Hydrogen and Deuterium Plasmas in the Edge Stochastic Magnetic Field Layer of Large Helical Device (2023)
  • Author(s): Oishi Tetsutarou、Morita Shigeru、Kobayashi Masahiro、Kawamura Gakushi、Kawamoto Yasuko、Kawate Tomoko、Masuzaki Suguru、Suzuki Chihiro、Goto Motoshi
  • Journal Title: Plasma Volume: 6 Pages: 308～321
  • DOI: 10.3390/plasma6020021
  • Peer Reviewed / Open Access
• [Journal Article] Multiscale particle simulation of the temporal evolution of heat flux into poloidal gaps of castellated divertor with edge-localized modes (2023)
  • Author(s): Niu Guo-Jian、Kawamura Gakushi、Dai Shu-yu、Xu Qian、He Tao、Nian Fei-Fei、Wang Rong、Yang Zhong-Shi、Luo Guang-Nan
  • Journal Title: Nuclear Fusion Volume: 63 Pages: 066036～066036
  • DOI: 10.1088/1741-4326/accfad
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Heat load inside the gaps of castellated tungsten blocks with different shapes in KSTAR (2023)
  • Author(s): Xu Qian、Kawamura Gakushi、Bang Eun-Nam、Yang Zhongshi、Niu Guojian、Ding Fang、Hong Suk-Ho、Luo Guang-Nan
  • Journal Title: Nuclear Materials and Energy Volume: 34 Pages: 101390～101390
  • DOI: 10.1016/j.nme.2023.101390
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Correlation of the Orthogonal Basis of the Core Plasma Distribution to the Divertor Footprint Distribution in LHD (2023)
  • Author(s): TANAKA Hirohiko、MASUZAKI Suguru、KAWAMURA Gakushi、HAYASHI Yuki、KOBAYASHI Masahiro、SUZUKI Yasuhiro、MUKAI Kiyofumi、KAJITA Shin、OHNO Noriyasu
  • Journal Title: Plasma and Fusion Research Volume: 18 Pages: 2402021～2402021
  • DOI: 10.1585/PFR.18.2402021
  • Peer Reviewed / Open Access
• [Journal Article] A reduced-turbulence regime in the Large Helical Device upon injection of low-Z materials powders (2023)
  • Author(s): Nespoli F.、Tanaka K.、Masuzaki S.、Ashikawa N.、Shoji M.、Gilson E.P.、Lunsford R.、Oishi T.、Ida K.、Yoshinuma M.、Takemura Y.、Kinoshita T.、Motojima G.、Osakabe M.、Kenmochi N.、Kawamura G.、Suzuki C.、Nagy A.、Bortolon A.、Pablant N.A.、Mollen A.、Tamura N.、Gates D.A.、Morisaki T.
  • Journal Title: Nuclear Fusion Volume: 63 Pages: 076001～076001
  • DOI: 10.1088/1741-4326/acd465
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Transition from MAR to EIR of deuterium plasma detachment in NAGDIS-II (2023)
  • Author(s): Shi Jielin、Kaizawa Hideki、Tanaka Hirohiko、Kajita Shin、Ohno Noriyasu、Ding Hongbin
  • Journal Title: Physica Scripta Volume: 98 Pages: 115605～115605
  • DOI: 10.1088/1402-4896/acfeb4
  • Peer Reviewed / Int'l Joint Research
• [Presentation] 直線装置NAGDIS-IIにおける非接触重水素プラズマのEMC3-EIRENE輸送モデリング (2023)
  • Author(s): 河村学思，田中宏彦，SHI Jielin，螺澤英樹，大野哲靖，FRERICHS Hinke，FENG Yuhe
  • Organizer: 第40回プラズマ・核融合学会年会
• [Presentation] Transport modeling of deuterium plasma detachment in the linear device NAGDIS-II with EMC3-EIRENE (2023)
  • Author(s): Gakushi Kawamura, Hirohiko Tanaka, Jielon Shi, Hideki Kaizawa, Noriyasu Ohno, Heinke Frericsh, Yuhe Feng
  • Organizer: 19th International Workshop on Plasma Edge Theory in Fusion Devices
  • Int'l Joint Research
• [Presentation] Impact of multi-fold magnetic structure on spectroscopy in Heliotron J based on EMC3-EIRENE code (2023)
  • Author(s): F. Cai, S. Kado, G. Kawamura, C. Feng, R. Matoike, A. Miyashita, S. Ohshima, T. Minami, S. Inagaki, F. Kin, S. Kobayashi, A. Ishizawa, Y. Nakamura, H. Okada, S. Konoshima, T. Mizuuchi, Y. Feng, H. Frerichs, K. Nagasaki
  • Organizer: 19th International Workshop on Plasma Edge Theory in Fusion Devices
  • Int'l Joint Research
• [Presentation] EMC3-EIRENE simulation of the magnetic field ripple effet on edge impurity flows in Heliotron J (2023)
  • Author(s): F. Cai, S. Kado, G. Kawamura, R. Matoike, S. Ohshima, T. Minami, S. Inagaki,S. Kobayashi, A. Ishizawa, Y. Nakamura, H. Okada, S. Konoshima, T. Mizuuchi, Y. Feng, H. Frerichs, K. Nagasaki
  • Organizer: 49th European Conference on Plasma Physics
  • Int'l Joint Research
• [Presentation] Divertor target design and footprint analysis on CFQS with different magnetic field configurations (2023)
  • Author(s): B. Liu, G. Kawamura, Y. Suzuki, A. Shimizu, H. Frerichs, Y. Feng, S.Y. Dai, Y.H. Xu
  • Organizer: 19th International Workshop on Plasma Edge Theory in Fusion Devices
  • Int'l Joint Research
• [Presentation] ヘリウムプラズマおよび水素プラズマの一次元PICコード・中性粒子輸送コードの開発・統合 (2023)
  • Author(s): 小山晟矢，小山諒典，NGUTEN HONG LAM，澤田圭司，大野哲靖， 中村浩章，齋藤誠紀，河村学思
  • Organizer: 第40回プラズマ・核融合学会年会
• [Presentation] Study on effects of neutral particle behavior on detached plasma formation using linear plasma device and modeling (2023)
  • Author(s): Yuki Hayashi, Noriyasu Ohno, Hirohiko Tanaka, Hiroki Natsume, Kento Sugiura, Ryoji Mano, Shota Masuda, Ryusei Migita, Keiji Sawada, Shin Kajita, Tadashi Thujihara, Hiroshi Ohshima, Mitsutoshi Aramaki, Gakushi Kawamura
  • Organizer: Global Plasma Forum in Aomori
  • Int'l Joint Research
• [Presentation] Weighted sum estimation of radiation power and toroidal asymmetry in LHD (2023)
  • Author(s): Gakushi Kawamura, Kiyofumi Mukai, Byron Peterson
  • Organizer: Global Plasma Forum in Aomori
  • Int'l Joint Research