NIFS-287

FULL TEXT (PDF, 440 KB)

Author(s):

K. Itoh and S-I. Itoh

Title:

Influence of the Wall Material on the H-mode Performance

Date of publication:

June 1994

Key words:

H-mode, neutral particles, radial electric field, charge exchange exchange loss, wall reflection, high -Z material, low-Z material

Abstract:

Theory on the influence of the wall material on the level of the enhanced confinement in H-mode is discussed. When the high-Z material is employed as the wall, the reflection of the neutral particles causes the higher neutral particle density in the plasma. The increased neutral particles lead to the loss of the ion momentum, decrease the radial electric field and degrade the confinement improvement.

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