Impurity behaviour in LHD long pulse discharges

Y. Nakamura, Y. Takeiri, B. J. Peterson, S. Muto, K. Ida, H. Funaba, M. Yokoyama, K. Narihara, Y. Nagayama, S. Inagaki, T. Tokuzawa, S. Morita, M. Goto, K. Sato, M. Osakabe, S. Masuzaki, H. Suzuki, R. Kumazawa, T. Mutoh, T. ShimozumaM. Sato, N. Noda, K. Kawahata, N. Ohyabu, O. Motojima

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17 Citations (Scopus)


Intrinsic impurity behaviour in neutral beam heated LHD long pulse discharges with a discharge duration of 10 s was investigated. Spectroscopic and bolometric measurements showed a remarkable temporal increase of core radiation due to metallic impurities. Central impurity accumulation was found in a narrow plasma density region (n̄e = 1-3 × 1019 m-3) for both density ramp-up discharges and constant density discharges. In the density ramp-up discharges, high-Z impurities were accumulated in the low-density region and diffused out from the core plasma in the high-density region. The impurity behaviour was compared with neoclassical predictions.

Original languageEnglish
Pages (from-to)2121-2134
Number of pages14
JournalPlasma Physics and Controlled Fusion
Issue number10
Publication statusPublished - Oct 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics


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