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Study of ripple-trapped proton behaviour in LHD by two line-of-sight measurements of fast neutrals

T. Saida, M. Sasao, M. Isobe, A.V. Krasilnikov, R. Kumazawa, T. Mutoh, T. Watari, T. Seki, K. Saito, S. Murakami2004年被引用 11Nuclear FusionIF 3出版社

The behaviour of helical ripple-trapped particles in large helical device (LHD) have been investigated by two line-of-sights natural diamond detector measurements in plasma sustained with ICRF for two types of resonance configurations, i.e. on-axis and saddle-shaped resonances. The tail temperature increases linearly as the Stix-temperature increases and then saturation follows, indicating the effect of the finite confinement time of the energetic ions. In the linear region, the tail readily increases when the line-of-sight is focused on the larger resonance area. The confinement time of the energetic ions is obtained from the empirical relation based on the Stix theory. The configuration with a saddle-shaped resonance has a longer confinement time than the on-axis resonance. Analyses of experimental measurements are consistent with the theoretical calculations including collisional ripple-induced transport.

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