NIFS-158

FULL TEXT (PDF, 534 KB)

Author(s):

K. Itoh and S.-I. Itoh

Title:

Transition to H-Mode by Energetic Electrons

Date of publication:

July 1992

Key words:

H-mode, Hot Electrons, Radial Electric Field, Bifurcation, Ripple Loss

Abstract:

Effect of the electron loss due to the toroidal ripple on an H-mode transition is studied. When energetic electrons exist in tokamaks, e.g. in the case of the current drive by lower hybrid (LH) waves, the edge electric field can show the bifurcation to the more positive value. In this state, both the electron loss and ion loss (such as loss cone loss) are reduced. The criterion for the transition is derived. Comparison with H-mode in JT-60 LH plasma shows a qualitative agreement.

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