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Author(s):
S.-I. Itoh and K. Itoh
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Title:
Change of Transport at L-and H-mode Transition
Date of publication:
Jan. 1990
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Key words:
H-mode Transition, Tokamaks, Anomalous Transport, Reduced Fluctuations, Radial Electric Field, Microinstability
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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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