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Radial structure of edge MHD modes in LHD plasmas with L-H transition

Plasma Physics and Controlled Fusion, ISSN: 0741-3335, Vol: 48, Issue: 5 A, Page: A201-A208
2006
  • 15
    Citations
  • 0
    Usage
  • 8
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    15
    • Citation Indexes
      15
  • Captures
    8

Conference Paper Description

In the Large Helical Device (LHD), edge coherent MHD modes such as m/n = 2/3 or 1/2 (m, n: poloidal and toroidal mode numbers), of which the rational surface is located in the plasma edge region of the magnetic hill, are strongly enhanced after an L-H transition. In this case, an edge MHD mode localized in a region further in than the location of the enhanced MHD modes is often stabilized because of the decrease in the pressure gradient there. Enhancement of the edge MHD mode amplitude stops a substantial rise in the edge pressure gradient after the transition. In an L-H transition plasma, soft x-ray (SX) fluctuations, δI, related to edge MHD modes are clearly detected. The radial profiles of the amplitude and the phase differences among the SX-detector channels are sensitively dependent on the m-number. The relative amplitudes of the SX fluctuations, δI/I, which may reflect the eigenfunction of the MHD mode, rapidly increase towards the plasma edge in which the relevant rational surface exists. © 2006 IOP Publishing Ltd.

Bibliographic Details

F Watanabe; K Toi; S Ohdachi; S Takagi; S Sakakibara; K Y Watanabe; S Morita; K Narihara; K Tanaka; K Yamazaki; the LHD experimental group

IOP Publishing

Energy; Physics and Astronomy

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