Flux surface shape and current profile optimization in tokamaks
作者:
D. R. Dobrott,
R. L. Miller,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1977)
卷期:
Volume 20,
issue 8
页码: 1361-1371
ISSN:0031-9171
年代: 1977
DOI:10.1063/1.862019
出版商: AIP
数据来源: AIP
摘要:
Axisymmetric tokamak equilibria of noncircular cross section are analyzed numerically to study the effects of flux surface shape and current profile on ideal and resistive interchange stability. Various current profiles are examined for circles, ellipses, dees, and doublets. A numerical code separately analyzes stability in the neighborhood of the magnetic axis and in the remainder of the plasma using the criteria of Mercier and Glasser, Greene, and Johnson. Results are interpreted in terms of flux surface averaged quantities such as magnetic well, shear, and the spatial variation in the magnetic field energy density over the cross section. The maximum stable &bgr; is found to vary significantly with shape and current profile. For current profiles varying linearly with poloidal flux, the highest &bgr;’s found were for doublets. Finally, an algorithm is presented which optimizes the current profile for circles and dees by making the plasma everywhere marginally stable.
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