S Okamura et al 2004 Plasma Phys. Control. Fusion 46 A113 doi:10.1088/0741-3335/46/5A/012
S Okamura1, T Minami1, T Oishi2, C Suzuki1, K Ida1, M Isobe1, Y Yoshimura1, K Nagaoka1, K Toi1, A Fujisawa1, T Akiyama1, H Iguchi1, R Ikeda1, S Kado3, K Matsuoka1, H Matsushita1, K Nakamura1, H Nakano1, S Nishimura1, M Nishiura1, S Ohshima1, A Shimizu1, S Takagi1, C Takahashi1, M Takeuchi1 and M Yoshinuma1
Show affiliationsThe edge transport barrier (ETB) for particle transport is formed in the neutral beam (NB) heated hydrogen discharges in compact helical system (CHS). The transition to the ETB formation and the back transition are controlled by the heating power. The existence of the heating power threshold is confirmed and it is roughly proportional to the density. The Hα emission signal shows a clear drop at the transition (the timescale of signal decrease is ~1 ms for the high heating power case). The ETB formation continues for the full duration of NB injection (100 ms) with a moderate level of radiation power loss. Local density profile measurement shows increase of the edge density and the movement of the density gradient region towards the edge.
52.40.Hf Plasma-material interactions; boundary layer effects
52.35.-g Waves, oscillations, and instabilities in plasmas and intense beams
52.55.Hc Stellarators, torsatrons, heliacs, bumpy tori, and other toroidal confinement devices
Issue 5A (May 2004)
Received 11 October 2003
Published 5 April 2004
S Okamura et al 2004 Plasma Phys. Control. Fusion 46 A113
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