Tomography analysis of the sawtooth crash with post-cursor in LHCD plasma on HT-7 tokamak

Sawtooth oscillations with post-cursor were observed in LHCD plasma on HT-7 tokamak. The mode exists and decays gradually after the crash, which implies that the magnetic reconnection is incomplete and the central safety factor remains below unity after the crash. From results of the singular value...

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Bibliographic Details
Published in:Physics letters. A 2008-06, Vol.372 (24), p.4469-4473
Main Authors: Chen, Kaiyun, Hu, Liqun, Duan, Yanmin, Ma, Tianpeng
Format: Article
Language:English
Subjects:
Post-cursor
Sawtooth
Stochastic magnetic field
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Summary:Sawtooth oscillations with post-cursor were observed in LHCD plasma on HT-7 tokamak. The mode exists and decays gradually after the crash, which implies that the magnetic reconnection is incomplete and the central safety factor remains below unity after the crash. From results of the singular value decomposition (SVD) and tomographic reconstructions describing the magnetic surface structures in the crash, it was found that the m / n = 1 / 1 mode survives in the crash. It is shown that, the appearance of the preservation of this mode is inconsistent with the secondary reconnection theory, and we conjecture that the evolving of this mode may be understood with the stochastic field model.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2008.04.018