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Author(s):
K. Itoh, S.-I. Itoh, H. Soltwisch and H.R. Koslowski
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Title:
Generation of Toroidal Current Sheet at Sawtooth Crash
Date of publication:
Feb. 1997
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Key words:
sawtooth crash, toroidal current sheet, TEXTOR tokamak, secondary current
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Abstract:
The mechanism to generate the toroidal sheet current after the sawtooth crash (observation on TEXTOR tokamak) is discussed. A possible hypothesis is presented. The crash of central pressure causes the steep gradient near the boundary between the flattened region and the unperturbed region. This sharp pressure gradient gives rise to the strong secondary current (transient Pfirsch-Schluter current). The location. polarity, magnitude and time evolution of the current sheet are analyzed. Comparison with present experimental data is made. and future necessary measurements are discussed.
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