Edge transport barrier formation in compact helical system

S. Okamura, T. Minami, T. Oishi, C. Suzuki, K. Ida, M. Isobe, Y. Yoshimura, K. Nagaoka, K. Toi, A. Fujisawa, T. Akiyama, H. Iguchi, R. Ikeda, S. Kado, K. Matsuoka, H. Matsushita, K. Nakamura, H. Nakano, S. Nishimura, M. NishiuraS. Ohshima, A. Shimizu, S. Takagi, C. Takahashi, M. Takeuchi, M. Yoshinuma

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The 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.

Original languageEnglish
Pages (from-to)A113-A119
JournalPlasma Physics and Controlled Fusion
Issue number5 SUPPL. A
Publication statusPublished - May 2004

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics


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