NIFS-840

FULL TEXT (PDF, 501 KB)

Author(s):

N. Tamura et al.

Title:

Impact of Nonlocal Electron Heat Transport on the High Temperature Plasmas of LHD

Date of publication:

Oct. 2006

Key words:

21 IAEA Fusion Energy Conference , EX/5-6

Abstract:

Edge cooling experiments with a tracer-encapsulated solid pellet in the Large Helical Device (LHD) show a significant rise of core electron temperature (the maximum rise is around 1 keV) as well as in many tokamaks. This experimental result indicates the possible presence of the nonlocality of electron heat transport in plasmas where turbulence as a cause of anomalous transport is dominated. The nonlocal electron temperature rise in the LHD takes place in almost the same parametric domain (e.g. in a low density) as in the tokamaks. Meanwhile, the experimental results of LHD show some new aspects of nonlocal electron temperature rise, for example the delay of the nonlocal rise of core electron temperature relative to the pellet penetration time increases with the increase in collisionality in the core plasma and the decrease in electron temperature gradient scale length in the outer region of the plasma.

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