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Author(s):
S. Toda, S.-I, Itoh, M. Yagi, A. Fukuyama and K. Itoh
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Title:
Spatial Structure of Compound Dither in L/H Transition
Date of publication:
Mar. 2000
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Key words:
H-mode, double hyseresis, transpot barrier, ELMs, dithers
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Abstract:
To study the plasma evolutin and spatial structure at the L/H transition, the double hysteresis is examined by use of the 1-dimensional transport model equations. Three mechanisms for the bipolar losses, i.e., the loss cone loss, collisional bulk viscosity loss of ions and the anomalous loss are simultaneously retained. five-fold multiple bifurcations are found to exist at the plasma edge, similar to the previous 0-dimensional study. Double hysteresis causes a self-generated oscillation, which is attributed to the compound dither, a kind of ELMs. Spatio-temporal evolution of the compound dither is analyzed.
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