Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
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Blob/Hole Generation in the Divertor Leg of the Large Helical Device
Hirohiko TANAKANoriyasu OHNOYoshiyuki TSUJIShin KAJITASuguru MASUZAKIMasahiro KOBAYASHITomohiro MORISAKIAkio KOMORIthe LHD Experimental Group
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2012 Volume 7 Pages 1402152


We have analyzed ion saturation current fluctuation measured by a fast scanning Langmuir probe (FSP) in edge region of the Large Helical Device (LHD). Positive and negative spikes of the ion saturation current were observed in the private region and on the divertor leg, respectively. It was found that the boundary position between these regions corresponds to the low-field side (LFS) edge of the divertor leg where the gradient of the ion saturation current profile was the maximum. Such a positional relationship resembles that near the separatrix in the LFS in tokamaks, where blobs and holes are generated. Statistical analysis indicates similar fluctuation characteristics among different magnetic devices.

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© 2012 by The Japan Society of Plasma Science and Nuclear Fusion Research
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