Plasma resistivity in the presence of a reversed-field pinch dynamo
1984; AIP Publishing; Volume: 27; Issue: 7 Linguagem: Inglês
10.1063/1.864821
ISSN2163-4998
AutoresK.F. Schoenberg, R.W. Moses, R.L. Hagenson,
Tópico(s)Ionosphere and magnetosphere dynamics
ResumoA global calculation of reversed-field pinch (RFP) plasma resistivities, ηw∥ and ηk∥, based on power balance and magnetic helicity balance, respectively, is discussed. For reasonable RFP beta values (β<0.1), ηk∥ provides an estimate of plasma resistivity parallel to the magnetic field, and agrees with the Spitzer resistivity within a factor of two. The expression (1−ηk∥/ηw∥) indictes the fraction of ohmic heating power absorbed by fluctuations in the discharge. An examination of 180 kA discharges on the Los Alamos ZT-40M experiment suggests that approximately one-third of the ohmic heating power drives fluctuations, including the dynamo effect, during discharge sustainment.
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