Understanding and control of plasma detachment caused by composite gas seeding
Project/Area Number |
19K03790
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 14020:Nuclear fusion-related
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Research Institution | University of Tsukuba |
Principal Investigator |
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Project Status |
Completed (Fiscal Year 2021)
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Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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Keywords | 非接触プラズマ / ダイバータ / プラズマ-ガス相互作用 / 原子分子過程 / 分子活性化再結合 / 窒素 / 水素 / ターゲット形状 / プラズマ / 核融合 |
Outline of Research at the Start |
磁場閉じ込め核融合炉の実現において、プラズマとガスとの相互作用により形成される非接触プラズマの挙動の理解とその制御方法の確立は、ダイバータ板への熱粒子負荷低減、炉心プラズマとの整合性の点において重要な課題である。本研究では非接触プラズマ形成における水素ガスと不純物ガスの重畳効果に注目し、複合ガス入射による非接触プラズマ生成とその空間構造の理解を進める。本研究の遂行により、ITER/原型炉の非接触プラズマ制御に適用できる物理モデルの構築に寄与するとともに、ここで得られる知見から、気相反応の物理化学過程や、種々の化合物合成や機能性薄膜生成など、産業応用分野への展開も期待できる。
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Outline of Final Research Achievements |
Remarkable progress has been made on the understanding the role of N2 and H2 seeding on plasma detachment in divertor simulation experiments using the end-loss region of the tandem mirror device GAMMA 10/PDX. These issues have been experimentally investigated for different gas species, seeding rate and target angles. We have newly observed Nitrgoen Molecular Assisted/Activated Recombination (N-MAR) processes during combination seeding of N2 and H2 which led to a clear decrease of ion flux to the divertor target. Simultaneously, spectrum emission from the NH radical has been observed. The results indicate the importance of molecular gas behavior for not only heat load control in fusion device, but also application for such as nitride processing, ammonia production and so on. Furthermore, V-shaped target experiment in different target angles shows an area of Hydrogen-MAR move to upstream in the case of small angle slot.
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Academic Significance and Societal Importance of the Research Achievements |
本研究の主な成果であるプラズマ中での窒素-水素の反応過程の理解は、核融合炉実現において重要な課題のひとつである定常的な高熱流束プラズマに晒されるダイバータ板への熱負荷低減に不可欠な非接触プラズマ制御の高度化に寄与するものである。また、その反応過程の理解は窒素、水素を利用する産業応用分野においても重要な知見となると考えられる。
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Report
(4 results)
Research Products
(28 results)
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[Presentation] Observation of nitrogen assisted/associated recombination in divertor relevant hydrogen plasma of GAMMA 10/PDX2022
Author(s)
N. Ezumi, H. Gamo, T. Sugiyama, A. Kondo, N. Shigematsu, T. Seto, T. Okamoto, K. Takanashi, S. Takahashi, S. Togo, M. Hirata, J. Kohagura, M. Yoshikawa, Y. Nakashima, M. Sakamoto, S. Masuzaki
Organizer
ISPlasma2022 / IC-PLANTS2022
Related Report
Int'l Joint Research
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[Presentation] Plasma Detachment in GAMMA 10/PDX Tandem Mirror: Role of Molecule Gases and Target Configuration2021
Author(s)
N. EZUMI, T. SUGIYAMA, H. GAMO, Y. TAKAMI, T. IIJIMA, K. NOJIRI, T. HARA, Y. ANDO, A. KONDO, M. HIRATA, J. KOHAGURA, M. YOSHIKAWA, Y. NAKASHIMA, M. SAKAMOTO, R. PERILLO, H.Y. GUO, T. KUWABARA, H. TANAKA, N. OHNO, K. SAWADA, A. TONEGAWA, S. MASUZAKI
Organizer
28th IAEA Fusion Energy Conference (FEC 2020)
Related Report
Int'l Joint Research
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[Presentation] Influence of Nitrogen and Neon on Plasma Detachment during Combined Seeding with Hydrogen on Divertor Simulation Experiment of GAMMA 10/PDX2021
Author(s)
N. Ezumi, H. Gamo, T. Sugiyama, A. Kondo, S. Togo, M. Hirata, J. Kohagura, M. Yoshikawa, Y. Nakashima, M. Sakamoto, R. Perillo, N. Ohno, K. Sawada, S. Kado, S. Masuzaki
Organizer
30th ITPA-DivSOL meeting
Related Report
Int'l Joint Research
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[Presentation] Divertor simulation experiment in the open magnetic field of GAMMA 10/PDX: effect of nitrogen seeding on plasma detachment2021
Author(s)
N. Ezumi, H. Gamo, T. Sugiyama, A. Kondo, S. Togo, M. Hirata, J. Kohagura, M. Yoshikawa, Y. Nakashima, M. Sakamoto, R. Perillo, N. Ohno, K. Sawada, S. Masuzaki
Organizer
International Mini-Workshop on Open Magnetic Systems for Plasma Confinement (OS2021)
Related Report
Int'l Joint Research
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[Presentation] GAMMA 10/PDXダイバータ模擬実験における水素ガスと窒素及びネオンガスとの重畳入射が非接触プラズマ形成へ及ぼす影響2021
Author(s)
蒲生宙樹,江角 直道,杉山吏作, 近藤綾音, 重松直希, 瀬戸拓実, 東郷訓, 平田真史, 小波蔵純子, 吉川正志, 皇甫度均, 中嶋洋輔, 坂本瑞樹, R. Perillo, 桑原竜弥, 田中宏彦, 大野哲靖, 澤田圭司, 利根川昭, 増崎貴
Organizer
第38回プラズマ・核融合学会 年会
Related Report
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[Presentation] Role of Molecular Processes and Target Configuration on Plasma Detachment in GAMMA 10/PDX2021
Author(s)
N. Ezumi, H. Gamo, T. Sugiyama, K. Nojiri, A. Kondo, M. Hirata, J. Kohagura, M. Yoshikawa, Y. Nakashima, M. Sakamoto, R. Perillo, H.Y. Guo, T. Kuwabara, H. Tanaka, N. Ohno, K. Sawada, S. Kado, A. Tonegawa, S. Masuzaki
Organizer
24th International Conference on Plasma Surface Interaction in Fusion Devices (PSI-24)
Related Report
Int'l Joint Research
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[Presentation] Recent research progress on plasma detachment in divertor simulation experiment in GAMMA 10/PDX: Role of molecular processes and target configuration2020
Author(s)
N. Ezumi, H. Gamo, T. Sugiyama, K. Nojiri, A. Kondo, M. Hirata, J. Kohagura, M. Yoshikawa, Y. Nakashima, M. Sakamoto, R. Perillo, H.Y. Guo, T. Kuwabara, H. Tanaka, N. Ohno, K. Sawada, S. Kado, A. Tonegawa, S. Masuzaki
Organizer
4th Asia Pacific Conference on Plasma Physics (AAPPS-DPP2020)
Related Report
Int'l Joint Research / Invited
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[Presentation] Effects of V-shaped target angle on plasma behavior in the GAMMA 10/PDX divertor simulation experimental module2020
Author(s)
Tsukasa SUGIYAMA, Naomichi EZUMI, Hiroki GAMO1, Kunpei NOJIRI, Ayane KONDO, Mafumi HIRATA, Masayuki YOSHIKAWA, Dogyun HWANGBO, Houyang GUO, Junko KOHAGURA, Yousuke NAKASHIMA, Mizuki SAKAMOTO, Tatsuya KUWABARA, Hirohiko TANAKA, Noriyasu OHNO, Keiji SAWADA, Akira TONEGAWA, Suguru MASUZAKI, Gakushi KAWAMURA
Organizer
The 29th International Toki Conference on Plasma and Fusion Research (ITC29)
Related Report
Int'l Joint Research
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[Presentation] Influence of nitrogen ratio during combined seeding with hydrogen on plasma detachment in the divertor simulation experimental module of GAMMA 10/PDX2020
Author(s)
Hiroki GAMO, Naomichi EZUMI, Tsukasa SUGIYAMA, Kunpei NOJIRI, Ayane KONDO, Mafumi HIRATA, Junko KOHAGURA, Masayuki YOSHIKAWA, Yousuke NAKASHIMA, Dogyun HWANGBO, Mizuki SAKAMOTO, Renato PERILLO, Tatsuya KUWABARA, Hirohiko TANAKA, Noriyasu OHNO, Keiji SAWADA, Akira TONEGAWA, Suguru MASUZAKI
Organizer
The 29th International Toki Conference on Plasma and Fusion Research (ITC29)
Related Report
Int'l Joint Research
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[Presentation] Plasma detachment caused by composite gas seeding in front of variable angle V-shaped target of GAMMA 10/PDX2019
Author(s)
N. Ezumi, H. Gamo, T. Sugiyama, Y. Takami, T. Iijima, K. Nojiri, A. Terakado, T. Hara, Y. Ando, M. Sakamoto, M. Hirata, J. Kohagura, M. Yoshikawa, Y. Nakashima, R. Perillo, T. Kuwabara, H. Tanaka, N. Ohno, K. Sawada, A. Tonegawa and S. Masuzaki
Organizer
7th International Workshop on Plasma Material Interaction Facilities for Fusion (PMIF 2019)
Related Report
Int'l Joint Research
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[Presentation] Plasma detachment in divertor simulation experimental module of GAMMA 10/PDX: role of molecule gases2019
Author(s)
N. Ezumi, R. Perillo, T. Iijima, K. Nojiri, A. Terakado, M. Sakamoto, Y. Nakashima, M. Hirata, J. Kohagura, M. Yoshikawa, T. Hara, Y. Ando, H. Gamo, T. Sugiyama, Y. Takami, K. Honma, A. Kondo, T. Kuwabara, H. Tanaka, N. Ohno, K. Sawada, S. Kado, A. Tonegawa and S. Masuzaki
Organizer
The 28th International Toki Conference on Plasma and Fusion Research (ITC28)
Related Report
Int'l Joint Research / Invited
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[Presentation] GAMMA 10/PDX における窒素-水素複合入射による非接触プラズマ形成への V字ターゲット角度の影響2019
Author(s)
江角直道, 飯島貴朗, 野尻訓平, 寺門明紘, 原利樹, 安藤泰斗, 杉山吏作, 蒲生宙樹, 髙見耀平, 本間佳史, 近藤綾音, 坂本瑞樹, 平田真史, 小波蔵純子, 吉川正志, 中嶋洋輔, R. Perillo, 桑原竜弥, 田中宏彦, 大野哲靖, 澤田圭司, 利根川昭, 増崎貴
Organizer
第36回プラズマ・核融合学会年会
Related Report
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