NIFS-451

FULL TEXT (PDF, 488 KB)


Author(s):

J. Li, X. Gong, L. Luo, F.X. Yin, N. Noda, B. Wan, W. Xu, X. Gao, F. Yin, J.G. Jiang, Z. Wu., J.Y. Zhao, M. Wu, S. Liu and Y. Han

Title:

Effects of High Z Probe on Plasma Behavior in HT-6M Tokamak

Date of publication:

Sep. 1996

Key words:

high Z wall material, biasing, impurity source, improved confinement mode, erosion & particle deposition, HT-6M

Abstract:

Molybdenum and tungsten probes have been tested in HT-6M tokamak under various discharge conditions aiming to find out the conditions in which high Z PFC can be used without serious degradation of core plasma performance was jound only when the probe was inserted beyond 3.0 cm inside the last closed flux surface (LCFS). The plasma performance did not change with positive biasing to the probe, whereas central T_e degraded during negative biasing of -100 V. The insertion of the Mo probe to 1.5 cm inside the LCFS made a change in ghe threshold power of the L-H transition in EOH discharges. These results suggest a certain operation range of the H-mode in the EOH discharge with the Mo probe in HT-6M.

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