Study of anisotropic velocity distribution function for electrons and protons for fusion plasma based on VUV spectroscopic measurements

2017 Fiscal Year Final Research Report

• Project/Area Number: 26287148
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Plasma science
• Research Institution: National Institute for Fusion Science
• Principal Investigator: Goto Motoshi 核融合科学研究所, ヘリカル研究部, 准教授 (00290916)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 非等方的速度分布関数 / 偏光プラズマ分光

Outline of Final Research Achievements

Polarization resolved VUV spectroscopic measurement has been made for the Lyman-alpha line of hydrogen atoms in the Large Helical Device at National Institute for Fusion Science. The polarization degree takes about 5% at the maximum and shows a decaying tendency with increasing electron density of the plasma. On the other hand, an atomic model has been constructed based on the polarization creation cross section due to electron collisions. When a velocity function which has different temperatures in the direction parallel and perpendicular to the magnetic field direction, respectively, is adopted, it is confirmed that the line emission shows a similar degree of polarization to the measurement with anisotropy of about 10% in the velocity distribution function.

Free Research Field

プラズマ分光学