Hydrogen reflection and desorption at the plasma electrode of a negative hydrogen ion source

• Project/Area Number: 17H03512
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: Doshisha University
• Principal Investigator: Wada Motoi 同志社大学, 理工学部, 教授 (30201263)
• Co-Investigator(Kenkyū-buntansha): 津守 克嘉 核融合科学研究所, ヘリカル研究部, 教授 (50236949)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥14,300,000 (Direct Cost: ¥11,000,000、Indirect Cost: ¥3,300,000); Fiscal Year 2020: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2018: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000); Fiscal Year 2017: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
• Keywords: 負イオン / 仕事関数 / 粒子反射 / スパッタリング / 負イオン源 / 中性粒子加熱 / 表面生成 / 中性粒子入射 / プラズマ加熱 / 負イオン表面生成 / イオン源 / 水素負イオン / 粒子表面散乱 / 吸着粒子脱離 / プラズマ固体壁相互作用 / ECR放電 / 中性粒子ビーム / プラズマ対向機器 / 表面粒子反射 / 表面負イオン化 / レーザー計測 / 表面素過程 / 高エネルギー粒子加速 / プラズマ－表面相互作用 / 高エネルギー加速 / 加速器 / 原子分子物理 / 表面・界面物性 / 負イオン生成

Outline of Final Research Achievements

Ion sources delivering negative hydrogen (H-) ion beams for high-energy accelerators and neutral beam heating of the fusion experiment plasmas are operated with addition of Cs into the hydrogen discharge. Hydrogen particle reflection and adsorption at plasma grids (PG) for these sources are studied through two approaches: laboratory experiments and computer simulations based on binary collision approximation. A computer simulation model has predicted that the hydrogen isotope adsorbed layer between a Cs top layer and Mo PG bulk plays an important role in Cs loss through the surface collision cascade excited by a plasma bombardment. Another model has successfully predicted the energy distribution of H- ions produced at a C12A7 electride surface immersed in hydrogen plasma. Hydrogen reflection characteristics are now measured down to 200 eV/H incident energy, while this research project realized the system that enables measurement down to less than 20 eV/H incident energy.

Academic Significance and Societal Importance of the Research Achievements

本研究の成果により，Cs導入量の少ない負イオン源運転シナリオの構築が可能となった．本研究でも調査したCsを用いない負イオン生成に加え，省Cs型の負イオン源運転が可能となることにより，将来の核融合実証炉の設計指針策定にあたっての自由度が大きくなった．同時に，プラズマ―固体表面相互作用とプラズマシース領域を繋ぐ計算機科学分野の開拓にも，本研究は貢献した．社会的な意義としては脱炭素社会に向けて，今後研究開発が加速されるものと予想される核融合発電の実現に向けての貢献が期待される．2025年より実験が予定されているITER核融合計画においても本研究が対象とした水素負イオン源が用いられる予定である．

Research Products

• [Int'l Joint Research] Univ. P and M Curie, Ecole Polytechnique/Aix Marceille University(フランス)
• [Int'l Joint Research] Aix Marceille University(フランス)
• [Journal Article] Modelling of hydrogen atoms reflection from an annealed tungsten fuzzy surfaces (2021)
  • Author(s): Liu D.H.、Dai S.Y.、Wada M.、Yang K.R.、Chen J.Y.、Liu D.P.、Cherenda N.、Wang D.Z.
  • Journal Title: Nuclear Materials and Energy Volume: 26 Pages: 100909-100909
  • DOI: 10.1016/j.nme.2021.100909
  • Peer Reviewed
• [Journal Article] Modelling of hydrogen reflection on tungsten fuzzy surface in an erosive hydrogen plasma (2020)
  • Author(s): Liu D.H.、Dai S.Y.、Wada M.、Wang M.、Wang D.Z.
  • Journal Title: Nuclear Fusion Volume: 60 Issue: 5 Pages: 056018-056018
  • DOI: 10.1088/1741-4326/ab7b3a
  • Peer Reviewed
• [Journal Article] Plasma Excitation in a DC Linear Magnetic Field by a Duoplasmatron Plasma Cathode (2020)
  • Author(s): Jhoelle Roche M. GUHIT, Arnold Rey B. GINES, Kenta DOI and Motoi WADA
  • Journal Title: Plasma and Fusion Research Volume: 15
  • NAID: 130007882178
  • Peer Reviewed
• [Journal Article] Measurement of time dependent beam profile of an RF-driven H- ion source (2020)
  • Author(s): M. Wada, K. Shinto, T. Shibata, M. Sasao
  • Journal Title: Review of Scientific Instruments Volume: 91 Issue: 1 Pages: 013330-013330
  • DOI: 10.1063/1.5128015
  • Peer Reviewed
• [Journal Article] Positive and negative hydrogen ion reflections of low-energy atomic and molecular hydrogen ion beam from HOPG and Mo surfaces (2020)
  • Author(s): Tanaka Nozomi、Ikemoto Fumiya、Yamada Ippei、Shimabukuro Yuji、Kisaki Masashi、Di?o Wilson Agerico、Sasao Mamiko、Wada Motoi、Yamaoka Hitoshi
  • Journal Title: Review of Scientific Instruments Volume: 91 Issue: 1 Pages: 013313-013313
  • DOI: 10.1063/1.5129576
  • Peer Reviewed
• [Journal Article] Development of a miniaturized duoplasmatron ion source (2020)
  • Author(s): Kuzumi Tatsuya、Wada Motoi
  • Journal Title: Review of Scientific Instruments Volume: 91 Issue: 1 Pages: 013505-013505
  • DOI: 10.1063/1.5128752
  • Peer Reviewed
• [Journal Article] Hydrogen ion beam transport in an energy range lower than 50 eV: Ion beam species (2020)
  • Author(s): Ikemoto Fumiya、Yamada Ippei、Kasuya Toshiro、Kinsho Michikazu、Wada Motoi
  • Journal Title: Review of Scientific Instruments Volume: 91 Issue: 1 Pages: 013507-013507
  • DOI: 10.1063/1.5128518
  • Peer Reviewed
• [Journal Article] A compact electron cyclotron resonance negative hydrogen ion source for evaluation of plasma electrode materials (2020)
  • Author(s): Eguchi Takayuki、Sasao Mamiko、Shimabukuro Yuji、Ikemoto Fumiya、Kisaki Masashi、Nakano Haruhisa、Tsumori Katsuyoshi、Wada Motoi
  • Journal Title: Review of Scientific Instruments Volume: 91 Issue: 1 Pages: 013508-013508
  • DOI: 10.1063/1.5128610
  • Peer Reviewed / Open Access
• [Journal Article] Negative ion source operation with deuterium (2020)
  • Author(s): Bacal M、Wada M
  • Journal Title: Plasma Sources Science and Technology Volume: 29 Issue: 3 Pages: 033001-033001
  • DOI: 10.1088/1361-6595/ab6881
  • Peer Reviewed / Open Access
• [Journal Article] Characteristics of an ECR Sheet-Shaped Plasma Formed by a Combination of Permanent Magnets and Field Coils (2019)
  • Author(s): GINES Arnold Rey B.、WADA Motoi
  • Journal Title: Plasma and Fusion Research Volume: 14 Issue: 0 Pages: 3401085-3401085
  • DOI: 10.1585/pfr.14.3401085
  • NAID: 130007660674
  • ISSN: 1880-6821
  • Year and Date: 2019-05-16
  • Peer Reviewed / Open Access
• [Journal Article] Effect of Substrate Temperature on the Hydrogen Reflection at Metal Surfaces (2019)
  • Author(s): GUHIT Jhoelle Roche M.、DOI Kenta、WADA Motoi
  • Journal Title: Plasma and Fusion Research Volume: 14 Issue: 0 Pages: 3401098-3401098
  • DOI: 10.1585/pfr.14.3401098
  • NAID: 130007663748
  • Peer Reviewed / Open Access
• [Journal Article] Electric Potential Structure in the Extraction Region of the Negative Hydrogen Ion Source (2019)
  • Author(s): MASAKI Shingo、MAESHIRO Kenta、TSUMORI Katsuyoshi、WADA Motoi
  • Journal Title: Plasma and Fusion Research Volume: 14 Issue: 0 Pages: 3401136-3401136
  • DOI: 10.1585/pfr.14.3401136
  • NAID: 130007704083
  • Peer Reviewed / Open Access
• [Journal Article] Adsorption of H on Cs/W(110): Impact of H on the Stability of Cs on the Surface (2018)
  • Author(s): Abraham B. Padama Allan、Agerico Di?o Wilson、Wada Motoi、Tsumori Katsuyoshi、Kisaki Masashi、Kasai Hideaki、Nakanishi Hiroshi、Sasao Mamiko、Tanaka Nozomi
  • Journal Title: e-Journal of Surface Science and Nanotechnology Volume: 16 Issue: 0 Pages: 391-395
  • DOI: 10.1380/ejssnt.2018.391
  • NAID: 130007485392
  • ISSN: 1348-0391
  • Year and Date: 2018-09-20
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Effects of impurity ions upon Cs recycling in a negative hydrogen ion source (2018)
  • Author(s): Wada Motoi
  • Journal Title: AIP Conference Proceedings Volume: 2052 Pages: 020005-020005
  • DOI: 10.1063/1.5083723
  • Peer Reviewed / Open Access
• [Journal Article] Study of the materials on plasma electrode surface for negative ion extraction in hydrogen and deuterium operation (2018)
  • Author(s): Masaki S.、Maeshiro K.、Tsumori K.、Wada M.
  • Journal Title: AIP Conference Proceedings Volume: 2052 Pages: 020002-020002
  • DOI: 10.1063/1.5083720
  • Peer Reviewed / Open Access
• [Journal Article] Injection of atomic hydrogen from a thermal cracker cell to plasma grid surface of a H? ion source (2018)
  • Author(s): Shimabukuro Yuji、Kuzumi Tatsuya、Wada Motoi
  • Journal Title: AIP Conference Proceedings Volume: 2052 Pages: 020004-020004
  • DOI: 10.1063/1.5083722
  • Peer Reviewed / Open Access
• [Journal Article] Study of the beam extraction system of a negative ion source with a C12A7 electride plasma electrode (2018)
  • Author(s): Kobayashi M.、Sasao M.、Kisaki M.、Eguchi T.、Wada M.
  • Journal Title: AIP Conference Proceedings Volume: 2052 Pages: 020003-020003
  • DOI: 10.1063/1.5083721
  • Peer Reviewed / Open Access
• [Journal Article] Caesiated H- source operation with helium (2018)
  • Author(s): Tsumori K.、Wada M.、Nakano H.、Kisaki M.、Ikeda K.、Haba Y.、Nagaoka K.、Kamio S.、Fujiwara Y.、Osakabe M.
  • Journal Title: AIP Conference Proceedings Volume: 2052 Pages: 040015-040015
  • DOI: 10.1063/1.5083749
  • Peer Reviewed / Open Access
• [Journal Article] Spectroscopic study of hydrogen reflection at modified tungsten surface (2018)
  • Author(s): Doi Kenta、Lee Heun Tae、Tanaka Nozomi、Yamaoka Hitoshi、Ueda Yoshio、Wada Motoi
  • Journal Title: Fusion Engineering and Design Volume: 136 Pages: 100-105
  • DOI: 10.1016/j.fusengdes.2018.01.001
  • Peer Reviewed
• [Journal Article] Diagnostics of Ta deposited plasma electrode for negative hydrogen ion production with DC laser photodetachment method (2018)
  • Author(s): Masaki S.、Sasao M.、Wada M.
  • Journal Title: AIP Conference Proceedings Volume: 2011 Pages: 050031-050031
  • DOI: 10.1063/1.5053329
  • Peer Reviewed / Open Access
• [Journal Article] Development of a compact molecular hydrogen ion source for low-energy surface scattering experiments (2018)
  • Author(s): Yamada Ippei、Yamaoka Hitoshi、Sasao Mamiko、Wada Motoi
  • Journal Title: AIP Conference Proceedings Volume: 2011 Pages: 020007-020007
  • DOI: 10.1063/1.5053249
  • Peer Reviewed / Open Access
• [Journal Article] Contribution of atomic hydrogen flux on H? ion beam extracted from a negative hydrogen ion source (2018)
  • Author(s): Shimabukuro Yuji、Kuwahara Daisuke、Wada Motoi
  • Journal Title: AIP Conference Proceedings Volume: 2011 Pages: 050008-050008
  • DOI: 10.1063/1.5053306
  • Peer Reviewed / Open Access
• [Journal Article] Study of low-energy electron transport at extraction region in hydrogen negative ion source with an additional electron source (2018)
  • Author(s): Matsumoto Y.、Kisaki M.、Sasao M.、Wada M.
  • Journal Title: AIP Conference Proceedings Volume: 2011 Pages: 020011-020011
  • DOI: 10.1063/1.5053253
  • Peer Reviewed / Open Access
• [Journal Article] Negative-hydrogen-ion production from a nanoporous 12CaO ? 7Al2O3 electride surface (2018)
  • Author(s): Sasao Mamiko、Moussaoui Roba、Kogut Dmitry、Ellis James、Cartry Gilles、Wada Motoi、Tsumori Katsuyoshi、Hosono Hideo
  • Journal Title: Applied Physics Express Volume: 11 Issue: 6 Pages: 066201-066201
  • DOI: 10.7567/apex.11.066201
  • NAID: 210000136259
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Plasma-surface interaction in negative hydrogen ion sources (2018)
  • Author(s): Wada Motoi
  • Journal Title: Review of Scientific Instruments Volume: 89 Issue: 5 Pages: 052103-052103
  • DOI: 10.1063/1.5016262
  • Peer Reviewed / Open Access
• [Journal Article] Spectroscopy Study of Hydrogen Atoms Reflected From Tungsten Surface in a Magnetized Plasma (2018)
  • Author(s): Kenta Doi , Hitoshi Yamaoka, Takahiro Kenmotsu, and Motoi Wada
  • Journal Title: IEEE TRANSACTIONS ON PLASMA SCIENCE Volume: 46 Issue: 3 Pages: 482-488
  • DOI: 10.1109/tps.2018.2803753
  • Peer Reviewed
• [Journal Article] Electrode structure of a compact microwave driven capacitively coupled atomic beam source (2018)
  • Author(s): Y. Shimabukuro, H. Takahashi,M. Wada,
  • Journal Title: Japanese Journal of Applied Physics Volume: 57 Issue: 1S Pages: 01AA02-01AA02
  • DOI: 10.7567/jjap.57.01aa02
  • NAID: 210000148528
  • Peer Reviewed
• [Journal Article] Impact due to impurity contamination upon Cs consumption of a negative hydrogen ion source (2017)
  • Author(s): M. Wada, K. Doi, T. Kenmotsu
  • Journal Title: AIP Conference Proceedings Volume: 1869 Pages: 020003-020003
  • DOI: 10.1063/1.4995709
  • Peer Reviewed
• [Journal Article] Negative ion formation by proton reflection from a molybdenum surface at a shallow incidence angle (2017)
  • Author(s): M. Sasao, T. Kanazawa, K. Doi, Y. Watanabe, K. Tanemura, S. Kato, T. Kenmotsu, M. Wada, H. Yamaoka, M. Kisaki, K. Tsumori
  • Journal Title: AIP Conference Proceedings Volume: 1869 Pages: 020008-020008
  • DOI: 10.1063/1.4995714
  • Peer Reviewed
• [Journal Article] Effect due to plasma electrode adsorbates upon the negative ion current and electron current extracted from a negative ion source (2017)
  • Author(s): M. Bacal M. Wada
  • Journal Title: AIP Conference Proceedings Volume: 1869 Pages: 030025-030025
  • DOI: 10.1063/1.4995745
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Negative ion source fundamentals (2020)
  • Author(s): M. Wada
  • Organizer: The 7th International Conference on Negative Ions Beams and Sources
  • Int'l Joint Research / Invited
• [Presentation] Damage to N-NBI systems due to positive ion back-streaming (2020)
  • Author(s): M. Wada, T. Kenmotsu, K. Ikeda, M. Kisaki, H. Nakano, K. Tsumori
  • Organizer: The 7th International Symposium on Negative Ions, Beams and Sources
  • Int'l Joint Research
• [Presentation] High-speed emittance measurements for beams extracted from J-PARC RF ion source (2020)
  • Author(s): T. Shibata, K. Shinto, M. Wada, H. Oguri, K. Ohkoshi, K. Nanmo
  • Organizer: The 7th International Symposium on Negative Ions, Beams and Sources
  • Int'l Joint Research
• [Presentation] Plasma electrode shape suitable for negative hydrogen ion production (2020)
  • Author(s): K. Bito, M. Sasao, M. Wada
  • Organizer: The 7th International Symposium on Negative Ions, Beams and Sources
  • Int'l Joint Research
• [Presentation] Velocity distribution of hydrogen atoms in ion source discharges (2020)
  • Author(s): T. Tokai, Y. Shimabukuro, H. Takahashi, M. Wada
  • Organizer: The 7th International Symposium on Negative Ions, Beams and Sources
  • Int'l Joint Research
• [Presentation] C12A7エレクトライドの仕事関数ならびに負イオン生成挙動 (2020)
  • Author(s): 笹尾真実子, LTahri, G. Cartry, J-M Layet M. Minissale, A. Heiler, R. Friedl, U. Fantz, 尾藤圭太，和田元
  • Organizer: 第37回プラズマ核融合学会年会
• [Presentation] Plasma-wall interactions in ion sources (2020)
  • Author(s): Motoi WADA
  • Organizer: International Symposium of the Vacuum Society of the Philippines
  • Int'l Joint Research / Invited
• [Presentation] Plasmas in Caesium-Seeded Negative Ion Sources (2019)
  • Author(s): Katsuyoshi Tsumori, H. Nakano, K. Ikeda, M. Kisaki, S. Geng, K. Nagaoka, M. Wada, Y. Haba,S. Masaki, S. Kamio, Y. Fujiwara, M. Osakabe
  • Organizer: 34th International Conference on Phenomena in Ionized Gases
  • Int'l Joint Research
• [Presentation] Effect of tantalum deposition on plasma electrode surface upon negative hydrogen ion production (2019)
  • Author(s): Kenta Maeshiro, Motoi Wada, Singo Masaki
  • Organizer: 34th International Conference on Phenomena in Ionized Gases
  • Int'l Joint Research
• [Presentation] Detection efficiencies of a micro-channel plate for positive/negative low energy hydrogen ions (2019)
  • Author(s): Fumiya Ikemoto, Ippei Yamada, Yuji Shimabukuro, Nozomi Tanaka, Katsuyoshi Tsumori,Hitoshi Yamaoka, Mamiko Sasao, Motoi Wada
  • Organizer: 34th International Conference on Phenomena in Ionized Gases
  • Int'l Joint Research
• [Presentation] Measurement of a time dependent spatial beam profile of an RF-driven H- ion source (2019)
  • Author(s): M. Wada , K. Shinto, T. Shibata, and M. Sasao
  • Organizer: The 18th International Conference on Ion Sources
  • Int'l Joint Research
• [Presentation] Positive and negative hydrogen ion reflections of low-energy atomic and molecular hydrogen ion beam from HOPG and Mo surfaces (2019)
  • Author(s): Nozomi Tanaka , Fumiya Ikemoto, Ippei Yamada, Yuji Shimabukuro , Masashi Kisaki, Wilson, Agerico Dino , Mamiko Sasao, Motoi Wada, and Hitoshi Yamaoka
  • Organizer: The 18th International Conference on Ion Sources
  • Int'l Joint Research
• [Presentation] Development of a miniaturized duoplasmatron ion source (2019)
  • Author(s): Tatsuya Kuzumi, and Motoi Wada
  • Organizer: The 18th International Conference on Ion Sources
  • Int'l Joint Research
• [Presentation] Hydrogen ion beam transport in an energy range lower than 50 eV: Ion beam species (2019)
  • Author(s): Fumiya Ikemoto, Ippei Yamada, Toshiro Kasuya, Michikazu Kinsho, and Motoi Wada
  • Organizer: The 18th International Conference on Ion Sources
  • Int'l Joint Research
• [Presentation] A compact electron cyclotron resonance negative hydrogen ion source for evaluation of plasma electrode materials (2019)
  • Author(s): Takayuki Eguchi, Mamiko Sasao, Yuji Shimabukuro, Fumiya Ikemoto, Masashi Kisaki, Haruhisa Nakano,Katsuyoshi Tsumori, and Motoi Wada
  • Organizer: The 18th International Conference on Ion Sources
  • Int'l Joint Research
• [Presentation] Laser desorption measurement of cesium adsorbed on a molybdenum plasma grid of a negative hydrogen ion source (2019)
  • Author(s): Aliena Mari MIRANDA, James Edward HERNANDEZ II, Allen Vincent CATAPANG, Glynnis Mae SAQUILAYAN, Mieko KASHIWAGI, Motoi WADA
  • Organizer: The 28th International Toki Conference on Plasma and Fusion Research
  • Int'l Joint Research
• [Presentation] エレクトライド電極を用いた小型水素負イオン源：表面生成基礎実験との比較 (2019)
  • Author(s): 笹尾真実子, 小林益美, 江口貴之, 島袋祐次, James Hernandez II, 木崎雅志, 津守克嘉, 和田元
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] 低仕事関数材料をプラズマ電極とする水素負イオン源 (2019)
  • Author(s): 和田元, 小林益美, 江口貴之, 笹尾真実子, 木崎雅志, 津守克嘉
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] Effects of impurity ions upon Cs recycling in a negative hydrogen ion source (2018)
  • Author(s): Motoi Wada
  • Organizer: The 6th International symposium on Negative Ions, Beams and Sources
  • Int'l Joint Research
• [Presentation] Study of H- extraction from a single-hole plasma electrode of C12A7 electride (2018)
  • Author(s): M. Sasao, D. Kuwahara, M. Kobayashi, R Moussaoui, G. Cartry, M. Wada, T. Eguchi
  • Organizer: The 6th International symposium on Negative Ions, Beams and Sources
  • Int'l Joint Research
• [Presentation] Negative ion production study on nanoporous 12CaO.7Al2O3 electride surface in low pressure H2 plasma (2018)
  • Author(s): M. Roba, M. Sasao, M. Wada, G. Cartry, H. Hosono
  • Organizer: The 6th International symposium on Negative Ions, Beams and Sources
  • Int'l Joint Research
• [Presentation] Study of the Materials on Plasma Electrode Surface for Negative Ion Extraction in Hydrogen and Deuterium Operation (2018)
  • Author(s): S. Masaki, K. Maeshiro, K. Tsumori, M. Wada
  • Organizer: The 6th International symposium on Negative Ions, Beams and Sources
  • Int'l Joint Research
• [Presentation] Plasma Electrode Structure Suitable for H- Extraction from a Bernas Type Ion Source (2018)
  • Author(s): M. Ishikawa, K. Oura, N. Miyamoto, M. Wada
  • Organizer: The 6th International symposium on Negative Ions, Beams and Sources
  • Int'l Joint Research
• [Presentation] Injection of Atomic Hydrogen from a Thermal Cracker Cell to Plasma Grid Surface of H- Ion Source (2018)
  • Author(s): Y. Shimabukuro, T. Kuzumi, M. Wada
  • Organizer: The 6th International symposium on Negative Ions, Beams and Sources
  • Int'l Joint Research
• [Presentation] Design of Negative Ion Source Using a Plasma Electrode of C12A7 Electride (2018)
  • Author(s): M. Sasao, M. Kisaki, M. Wada, T. Eguchi
  • Organizer: The 6th International symposium on Negative Ions, Beams and Sources
  • Int'l Joint Research
• [Presentation] Caesiated H- source operation with helium (2018)
  • Author(s): K. TSUMORI, M. WADA, Motoi, M. KISAKI, H.NAKANO, K. IKEDA, Y. HABA, K. NAGAOKA,Y. FUJIWARA, S. KAMIO, M. OSAKAB
  • Organizer: The 6th International symposium on Negative Ions, Beams and Sources
  • Int'l Joint Research
• [Presentation] Electric Potential Structure in the Extraction Region of the Negative Hydrogen Ion Source (2018)
  • Author(s): S. Masaki, K. Maeshiro, K. Tsumori, M. Wada
  • Organizer: The 27th International Toki Conference on Plasma and Fusion Research & The 13th Asia Pacific Plasma Theory Conference
  • Int'l Joint Research
• [Presentation] C12A7エレクトライド製プラズマ電極を有するH-源 (2018)
  • Author(s): 小林益美，江口貴之，笹尾真実子，木崎雅志，津守克嘉，和田元
  • Organizer: 第35回 プラズマ・核融合学会年会
• [Presentation] 水素負イオン引き出し領域への非蒸発ゲッター材料の挿入 (2018)
  • Author(s): 正木伸吾，津守克嘉，和田元
  • Organizer: 第35回 プラズマ・核融合学会年会
• [Presentation] 水素正負イオンに対するMCPの検出効率 (2018)
  • Author(s): 池本史弥，山田逸平，島袋祐次，田中のぞみ，津守克嘉，山岡人志，笹尾眞實子，和田元
  • Organizer: 第35回 プラズマ・核融合学会年会
• [Presentation] プラズマ電極へのTa蒸着が与える水素負イオン引き出しへの効果 (2018)
  • Author(s): 眞榮城健太，正木伸吾，和田元
  • Organizer: 第35回 プラズマ・核融合学会年会
• [Presentation] 重水素運転時のH-イオン源プラズマグリッド上のCs 層厚 (2017)
  • Author(s): 和田 元，剣持 貴弘，笹尾 真実子,津守 克嘉
  • Organizer: 第78回応用物理学会秋季学術講演会
• [Presentation] 半導体光源を用いた仕事関数の測定 (2017)
  • Author(s): 桑原 大典，笹尾 真実子，和田 元
  • Organizer: 第78回応用物理学会秋季学術講演会
• [Presentation] Plasma-Surface Interaction in Negative Hydrogen Ion Sources (2017)
  • Author(s): Motoi Wada
  • Organizer: 17th International Conference on Ion Sources
  • Int'l Joint Research / Invited
• [Presentation] Contribution of Atomic Hydrogen Flux on H- Ion Beam extracted from a Negative Hydrogen Ion Source (2017)
  • Author(s): Yuji Shimabukuro, Daisuke Kuwahara, Motoi Wada
  • Organizer: 17th International Conference on Ion Sources
  • Int'l Joint Research
• [Presentation] Negative Ion Source Operation with Deuterium (2017)
  • Author(s): Marthe Bacal, Motoi WADA
  • Organizer: 17th International Conference on Ion Sources
  • Int'l Joint Research