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Author(s):
K. Itoh, S.-I. Itoh, A. Fukuyama, M. Yagi and M. Azumi
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Title:
Prandtl Number of Toroidal Plasmas
Date of publication:
June 1993
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Key words:
Prandtl number, Hartmann number, magnetic Prandtl number, Anomalous transport, Self-sustained turbulence, Tokamak, Helical systems, Collisionless skin depth
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Abstract:
Theory of the L-mode confinement in toroidal plasmas is developed. The Prandtl number , the ratio between the ion viscosity and the thermal conductivity is obtained for the anomalous transport process which is caused by the self-sustained turbulence in the toroidal plasma. It is found that the Prandtl number is of order unity both for the ballooning mode turbulence in tokamaks and for the interchange mode turbulence in helical system. The influence on the anomalous transport and fluctuation level is evaluated. Hartmann number and magnetic Prandtl number are also discussed.
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