Spectral structure in extended MHD turbulence

2015 Fiscal Year Final Research Report

• Project/Area Number: 23540583
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Plasma science
• Research Institution: National Institute for Fusion Science
• Principal Investigator: MIURA Hideaki 核融合科学研究所, ヘリカル研究部, 准教授 (40280599)
• Co-Investigator(Kenkyū-buntansha): ITO Atsushi 核融合科学研究所, ヘリカル研究部, 助教 (70413987) ; ARAKI Keisuke 岡山理科大学, 工学部, 教授 (90299181)
• Project Period (FY): 2011-04-28 – 2016-03-31
• Keywords: 拡張MHD / 乱流 / スペクトル / 不安定性 / Hall項 / ジャイロ粘性

Outline of Final Research Achievements

Influences of the ion skin depth and the finite Larmor radius effects on magnetohydrodynamic (MHD) turbulence have been studied by means of numerical simulations of extended MHD equations. It has been clarified that the ion skin depth (Hall) term can induce structure transition of the vorticity field from sheet to tubular structures, and that the term enhance the forward energy transfer of the magnetic energy at very large wave number region. It has also been clarified that the finite Larmor radius effect can induce secondary instability and excite high wave number coefficients. Based on these knowledge obtained by direct numerical simulations, we have successfully carried out large eddy simulations of MHD turbulence under the ion skin depth effects (Hall MHD turbulence).

Free Research Field

プラズマ物理