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Oct 13 – 18, 2014
Hotel Park Inn Pribaltiyskaya
Europe/Moscow timezone

Study of Neutral Hydrogen Transport in LHD Core Plasmas Based on High Dynamic-Range Balmer-Alpha Spectroscopy

Oct 16, 2014, 2:00 PM
4h 45m
Green 8-9 (Hotel Park Inn Pribaltiyskaya)

Green 8-9

Hotel Park Inn Pribaltiyskaya

Saint Petersburg, Russian Federation
Poster Poster 6


Dr Keisuke Fujii (Kyoto university)


The radial distribution of the neutral hydrogen atom density (n_H) and pressure (P_H) in the Large Helical Device (LHD) is studied. The n_H distribution is determined from a detailed analysis of the intensity-calibrated Balmer-alpha line profile while the P_H distribution is obtained with a simple one-dimensional analytical model. We have for the first time determined n_H at the center of a fusion-oriented plasma, which is approximately three orders smaller than that at the edge. On the contrary, P_H changes only a factor of 10 from the edge to core regions. The central n_H has a tendency to become smaller as the line-averaged electron density is increased.
Paper Number EX/P6-31
Country or International Organisation Japan

Primary author

Dr Keisuke Fujii (Kyoto university)


Dr Motoshi Goto (National Institute for Fusion Science) Prof. Shigeru Morita (National Institute for Fusion Science)

Presentation materials