Numerical calculation of axisymmetric non‐neutral plasma equilibria
作者:
Ross L. Spencer,
S. N. Rasband,
Richard R. Vanfleet,
期刊:
Physics of Fluids B: Plasma Physics
(AIP Available online 1993)
卷期:
Volume 5,
issue 12
页码: 4267-4272
ISSN:0899-8221
年代: 1993
DOI:10.1063/1.860594
出版商: AIP
数据来源: AIP
摘要:
Efficient techniques for computing axisymmetric non‐neutral plasma equilibria are described. These equilibria may be obtained either by requiring global thermal equilibrium, by specifying the midplane radial density profile, or by specifying the radial profile of ∫n dz. Both splines and finite‐differences are used, and the accuracy of the two is compared by using a new characterization of the thermal equilibrium density profile which gives a simple formula for estimating the radial and axial gradient scale lengths of thermal equilibria. It is found that for global thermal equilibrium 1% accuracy is achieved with splines if the distance between neighboring splines is about two Debye lengths while finite differences require a grid spacing of about one‐half Debye length to achieve the same accuracy.
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