Research on the ablation process of solid hydrogen via internal measurements of high-density plasmoid

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K03803
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 14020:Nuclear fusion-related
• Research Institution: National Institute for Fusion Science
• Principal Investigator: Motojima Gen 核融合科学研究所, ヘリカル研究部, 准教授 (00509507)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 固体水素 / 溶発 / 高速分光 / ファイバアレイ / 高速度カメラ / シュタルク拡がり

Outline of Final Research Achievements

In this study, we utilized a combination of a two-dimensional fiber array and a high-speed camera to conduct the world's first measurement of the two-dimensional spatial distribution of electron density inside low-ionization, high-density plasmoid (plasma clumps that form as a result of the sublimation of solid hydrogen, a nuclear fusion fuel) using the Heliotron J device at Kyoto University. These findings not only deepen our understanding of the basic mechanism of pellet ablation but also provide valuable information for comparison with ablation simulations.

Free Research Field

エネルギー理工学

Academic Significance and Societal Importance of the Research Achievements

核融合プラズマへの燃料供給法として固体水素入射の確立は重要な課題である。本研究の成果は、固体水素の溶発素過程の理解に大きく貢献するものであり、核融合プラズマの高密度化と燃料供給の最適化に貢献できるものである。