2013 Fiscal Year Final Research Report

Experimental evaluation of bulk-ion heating by energetic particle driven instabilities

Research Project

Project/Area Number	24656561
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Single-year Grants
Research Field	Nuclear fusion studies
Research Institution	National Institute for Fusion Science
Principal Investigator	OSAKABE Masaki 核融合科学研究所, ヘリカル研究部, 教授 (90280601)
Co-Investigator(Kenkyū-buntansha)	IDO Takeshi 核融合科学研究所, へリカル研究部, 准教授 (50332185) TOKUZAWA Tokihiko 核融合科学研究所, へリカル研究部, 准教授 (90311208) SHIMIZU Akihiro 核融合科学研究所, へリカル研究部, 助教 (00390633)
Project Period (FY)	2012-04-01 – 2014-03-31
Keywords	GAM / 高速イオン励起不安定性 / イオン異常加熱 / αチャンネリング
Research Abstract	On the Large Helical Device, the excitation of energetic particle driven instability, whose toroidal mode number is zero, and the increase in ion temperature being associated with the activity of the instabilities is observed when energetic particle beams are injected to very low density micro-wave sustained plasmas. From a theoretical analysis based on experimental observation, the instability was evaluated to be Geodesic Acoustic Mode (GAM). From the correlation analysis between the activity of the mode and the ion temperature behaviors, it was concluded the anomalous heating of bulk-ions is the most probable mechanism to explain the increase in the ion temperatures.