Investigation of negative ion extraction mechanism from a high-density ionic plasma

2015 Fiscal Year Final Research Report

• Project/Area Number: 25249134
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: Takeiri Yasuhiko 核融合科学研究所, その他部局等, 所長 (60179603)
• Co-Investigator(Kenkyū-buntansha): TSUMORI Katsuyoshi 核融合科学研究所, ヘリカル研究部, 准教授 (50236949)
• Co-Investigator(Renkei-kenkyūsha): IKEDA Katsunori 核融合科学研究所, ヘリカル研究部, 助教 (20321614) ; NAKANO Haruhisa 核融合科学研究所, ヘリカル研究部, 助教 (90442524) ; KISAKI Masashi 核融合科学研究所, ヘリカル研究部, 助教 (70598945) ; NAGAOKA Kenichi 核融合科学研究所, ヘリカル研究部, 准教授 (20353443) ; OSAKABE Masaki 核融合科学研究所, ヘリカル研究部, 教授 (90280601) ; HATAYAMA Akiyoshi 慶応義塾大学, 理工学部, 教授 (10245607)
• Research Collaborator: TOKUZAWA Tokihiko 核融合科学研究所, ヘリカル研究部, 准教授 (90311208)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 負イオン源 / 中性粒子ビーム入射 / プラズマ加熱 / イオン性プラズマ / 負イオンダイナミクス

Outline of Final Research Achievements

The investigation of negative ion extraction mechanism in the negative ion source was performed, and it was found; 1) externally applied electric field can penetrate deeply inside the extraction region, 2) negative ions are transported from the plasma grid (PG) toward driver region, 3) negative ions are extracted through whole region in the extraction region, 4) electron density and negative ion density near the PG responds to the extraction voltage, and 3D magnetic field structure plays a role for particle dynamics. These observations contribute to reveal the negative ion dynamics for the first time.

Free Research Field

核融合学