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Author(s):
K. Itoh and S-I. Itoh
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Title:
Geometry Changes Transient Transport in Plasmas
Date of publication:
June 2001
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Key words:
toroidal plasma, transient transport, ballooning mode, Kubo number, turbulence, meso scale
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Abstract:
Role of ballooning effect in toroidal plasmas on the transient transport problems is investigated. Due to the mode localization along the magnetic field line, a meso scale appears in a radial correlation length of fluctuating fields. This scale length introduces the interference of the gradient and flux in different radial locations. For the fluctuation which gives the gyro-Bohm-like diffusion in a stationary state, this long radial correlation of the fluctuating field causes a fast propagation of response against a rapid transient perturbation. Upper bound of transient thermal diffusivity is derived.
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