Evidence of Partial Reconnection during Sawtooth Crash on EAST ELM-Free H-Mode LHCD Plasma

Double q = 1 surfaces during a sawtooth crash were identified in EAST ELM-free H-mode LHCD plasma. An off-axis-peaking and enhanced soft-X-ray (SXR) profile due to the presence of high-Z impurities accumulated in the plasma core region is observed after a sawtooth crash. The observed sawtooth oscill...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2014-02, Vol.83 (2), p.1-1
Main Authors: Xu, Liqing, Hu, Liqun, Ma, Tianpeng
Format: Article
Language:English
Subjects:
Crashes
Formations
Impurities
Oscillations
Plasma physics
X-rays
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Summary:Double q = 1 surfaces during a sawtooth crash were identified in EAST ELM-free H-mode LHCD plasma. An off-axis-peaking and enhanced soft-X-ray (SXR) profile due to the presence of high-Z impurities accumulated in the plasma core region is observed after a sawtooth crash. The observed sawtooth oscillations with a nonmonotonic q profile can be explained satisfactorily by the partial reconnection model. Considerable high-Z impurities near the plasma centre are a response to the formation of double q = 1 surfaces.
ISSN:0031-9015
1347-4073