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Author(s):
S. Sasaki, Y. Uesugi, S. Takamura, H. Sanuki, K. Kadota
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Title:
Temporal Behavior of the Electron Density Profile During Limiter Biasing in the HYBTOK-II Tokamak
Date of publication:
Nov. 1993
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Key words:
limiter biasing, tokamak, plasma confinement, transient phenomena, laser blow-off lithium beam probing.
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Abstract:
A rapid change in the detailed edge electron density profile during positively biased limiter experiment is obtained with high temporal resolution of ~ 20 mu s using a laser blow-off lithium beam probe technique in HYBTOK-II tokamak. The transient change in the electron density profile and the movement of the position where a steep density gradient is formed are experimentally observed. The temporal behavior of the electron density profile correlates well with reductions in the biasing current and H alpha emission in the scrape-off layer, and the suppression of electrostatic fluctuations near the edge of the core region.
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