Time evolution of mass flows in a collisional tokamak
作者:
Adil B. Hassam,
Russell M. Kulsrud,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1978)
卷期:
Volume 21,
issue 12
页码: 2271-2279
ISSN:0031-9171
年代: 1978
DOI:10.1063/1.862166
出版商: AIP
数据来源: AIP
摘要:
The time evolution, due to dissipative processes, of an initial pattern of poloidal and toroidal mass flows in a tokamak is considered. The calculation is applicable to a collisional, low &bgr;, axisymmetric tokamak of arbitrary minor cross section. Time rates of change of poloidal flows which are subsonic but larger than the diamagnetic speed are given according to the magnitude of the flow and the collisionality of the plasma. Over most of parameter space for typical tokamaks, the poloidal rotation is strongly damped by magnetic pumping at the rate (l/qR)2&ngr;ii, wherelis the mean free path,qRis the ’’connection length,’’ and &ngr;iiis the ion‐ion collision frequency. At higher speeds, even stronger damping is effected by electron thermal conduction. The toroidal rotation is determined largely by the conservation of toroidal angular momentum. A heuristic explanation of the damping due to magnetic pumping is given.
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