Modeling visible forbidden line emission of highly-charged tungsten ions and its application to fusion plasma measurements

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H04235
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: KATO DAIJI 核融合科学研究所, ヘリカル研究部, 准教授 (60370136)
• Co-Investigator(Kenkyū-buntansha): 坂上 裕之 核融合科学研究所, ヘリカル研究部, 助教 (40250112) ; 中村 信行 電気通信大学, レーザー新世代研究センター, 准教授 (50361837)
• Co-Investigator(Renkei-kenkyūsha): MURAKAMI Izumi 核融合科学研究所, ヘリカル研究部, 教授 (30290919) ; GOTO Motoshi 核融合科学研究所, ヘリカル研究部, 准教授 (00290916) ; MORITA Shigeru 核融合科学研究所, ヘリカル研究部, 教授 (80174423)
• Research Collaborator: DING Xiaobin 西北師範大学, 准教授
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: タングステン分光計測

Outline of Final Research Achievements

Tungsten materials with excellent resistance to high heat load are used for plasma facing materials of International Thermonuclear Experimental Reactor (ITER). However, there is a concern about radiation collapse of core plasmas due to accumulation of sputtered tungsten particles into the core plasmas. Thus, understanding of tungsten transport characteristics in magnetic-confinement plasmas is an important issue. For the first time in the world, we have established a method for measurements of highly-charged tungsten ions in magnetic-confinement fusion plasmas using emission lines in the near-ultraviolet-visible region. As a result, the tungsten measurement of the core plasma, which had been performed in the soft X-ray region up to now, became possible in the long-wavelength region where neutron shielding of detectors is not required by the use of optical fibers.

Free Research Field

プラズマ原子過程