-
Author(s):
S.-I. Itoh, K. Itoh and S. Toda
-
Title:
Statistical Theory of L-H Transition and its Implication to Threshold Database
Date of publication:
Jan. 2003
-
Key words:
L-H transition, stochastic transition, transition rate, phase boundary, threshold database
-
Abstract:
A statistical model for the bifurcation of the radial electric field E_r is analyzed in view of describing L-H transitions of toroidal plasmas. Noise in micro fluctuations is shown to lead to random changes of E_r, if a deterministic approach allows for more than one solution. The probability density function for and the ensemble average of E_r are obtained. The L-to-H and the H-to-L transition probabilities are calculated, and the effective phase limit is derived. Due to the suppression of turbulence by shear in E_r, the limit deviates from Maxwell's rule.
-
|
