The Large Helical Device (LHD) helical divertor

N. Ohyabu, T. Watanabe, H. Ji, H. Akao, T. Ono, T. Kawamura, K. Yamazaki, K. Akaishi, N. Inoue, A. Komori, Y. Kubota, N. Noda, A. Sagara, H. Suzuki, O. Motojima, M. Fujiwara, A. Iiyoshi

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Abstract

The Large Helical Device (LHD) now under construction is a heliotron/torsatron device with a closed divertor system. The edge LHD magnetic structure has been studied in detail. A peculiar feature of the configuration is the existence of edge surface layers, a complicated three dimensional magnetic structure which does not, however, seem to hamper the expected divertor functions. Two divertor operational modes are being considered for the LHD experiment-high density, cold radiative divertor operation as a safe heat removal scheme and high temperature divertor plasma operation. In the latter operation, a divertor plasma with a temperature of a few keV, generated by efficient pumping, is expected to lead to a significant improvement in core plasma confinement. Conceptual designs of the LHD divertor components are under way.

Original languageEnglish (US)
Article numberI07
Pages (from-to)387-399
Number of pages13
JournalNuclear Fusion
Volume34
Issue number3
DOIs
StatePublished - Dec 1 1994

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Ohyabu, N., Watanabe, T., Ji, H., Akao, H., Ono, T., Kawamura, T., Yamazaki, K., Akaishi, K., Inoue, N., Komori, A., Kubota, Y., Noda, N., Sagara, A., Suzuki, H., Motojima, O., Fujiwara, M., & Iiyoshi, A. (1994). The Large Helical Device (LHD) helical divertor. Nuclear Fusion, 34(3), 387-399. [I07]. https://doi.org/10.1088/0029-5515/34/3/I07