NIFS-004

FULL TEXT (PDF, 427 KB)

Author(s):

S.-I. Itoh and K. Itoh

Title:

Change of Transport at L-and H-mode Transition

Date of publication:

Jan. 1990

Key words:

H-mode Transition, Tokamaks, Anomalous Transport, Reduced Fluctuations, Radial Electric Field, Microinstability

Abstract:

A new refined model of the L-mode and H-mode transition in tokamaks is presented based on the bifurcation of the radial electric field, E_r, near edge. The radial gradient of E_r is newly introduced to explain the sudden change of fluctuations as well as plasma fluxes at the onset of transition. This model predicts that the L-to H-mode transition is associated with the decrease of dE_r/dr causing reduction of particle and energy fluxes at critical gradient.

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