Study of two diminutional structure of meso-scale turbulence with directional beam emission spectroscopy

2014 Fiscal Year Final Research Report

• Project/Area Number: 23246164
• 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: IDA Katsumi 核融合科学研究所, ヘリカル研究部, 教授 (00184599)
• Co-Investigator(Kenkyū-buntansha): YOSHINUMA Mikirou 核融合科学研究所, ヘリカル研究部, 助教 (20323058) ; KOBAYASHI Tatsuya 核融合科学研究所, ヘリカル研究部, 助教 (30733703) ; MOON Chanho 核融合科学研究所, ヘリカル研究部, COE研究員 (50734753)
• Co-Investigator(Renkei-kenkyūsha): TAKAHASHI Hiromi 核融合科学研究所, ヘリカル研究部, 助教 (00462193)
• Research Collaborator: ONO Makoto 総合研究大学院大学, 物理科学研究科
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: プラズマ物理 / 乱流計測 / ビーム分光

Outline of Final Research Achievements

Two dimensional structure of plasma density fluctuations was studied using the beam emission spectroscopy in Large Helical Device (LHD). By making the observation volume slit, the directional sensitivity for radial or poloidal direction has been improved. The time-space correlation between density and magnetic fluctuations shows clear peaks with the frequency peak of 1.5kHz and 3kHz in the high-beta discharge in LHD. In poloildal direction, the fluctuations propagates in the direction of ExB rotation and this fluctuations was identified to be Edge Harmonic Oscillation (EHO) .

Free Research Field

プラズマ物理