Measurement of ion temperature spatial structure in high temperature plasmas based on Balmer-alpha spectrum

2016 Fiscal Year Final Research Report

• Project/Area Number: 26610191
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Plasma science
• Research Institution: Kyoto University
• Principal Investigator: Fujii Keisuke 京都大学, 工学研究科, 助教 (10637705)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: プラズマ分光 / 高ダイナミックレンジ分光

Outline of Final Research Achievements

We have developed a spectroscopic system that can measure hydrogen Balmer-\alpha spectrum with high-dynamic-range, high-temporal-resolution and multiple line-of-sights. In particular, we adopted a 64-ch photomultipler tube as a photo detecotr. We combined it with multi-channel current amplifiers and multi-channel analog-digital converters, as well as high-throughput spectrometer that compensates exposure time by high-temporal measurement.
We applied this system to Large Helical Device plasma in National Institute for Fusion Science, Toki, Japan. We detected a fluctuation of the spectral shape, which is possibly caused by temporal variation of electron density or ion temperature.

Free Research Field

高温プラズマ計測