New approach of investigation about fast ion physics by using a newly developed collective Thomson scattering

2015 Fiscal Year Final Research Report

• Project/Area Number: 24360385
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: Tanaka Kenji 核融合科学研究所, ヘリカル研究部, 准教授 (50260047)
• Co-Investigator(Kenkyū-buntansha): KUBO SHIN 核融合科学研究所, ヘリカル研究部, 教授 (80170025) ; SHIMOZUMA TAKASHI 核融合科学研究所, ヘリカル研究部, 教授 (80270487) ; NISHIURA MASAKI 東京大学, 大学院新領域創成科学研究科, 准教授 (60360616)
• Co-Investigator(Renkei-kenkyūsha): SAITO TERUO 福井大学, 遠赤外領域開発研究センター, 教授 (80143163) ; TATEMATSU YOSHINORI 福井大学, 遠赤外領域開発研究センター, 准教授 (50261756) ; MURAKAMI SADAYOSHI 京都大学, 工学系研究科, 教授 (40249967)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 磁場閉じ込め核融合 / マイクロ波 / 協同散乱 / トムソン散乱 / 高速イオン / ジャイラトロン

Outline of Final Research Achievements

This project aims to investigate the fast ion physics in magnetically confined plasma. For this purpose, we developed the microwave collective Thomson scattering (CTS) by using a high power gyrotron. CTS can measure both thermalized bulk ion components and non-thermalized fast ion components.
Two detection systems were developed. One is a filter bank system with slow digitizer (100kHz sample for 80sec) to measure temporal evolution of CTS spectrum, the other is a fast digitizer system (10GHz sample for 80msec) to measure fine structure of CTS spectrum. Scattering geometry was optimized for the precise measurements in order to reduce stray radiation. Measured CTS spectrum was compared with theoretical model calculated by numerical code, then, qualitative agreements were obtained. From the measurements of bulk ion components by using a fast digitizer system, ion density ratio was measured from the modulated spectrum due to ion Bernstein waves.

Free Research Field

磁場閉じ込め核融合