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Free‐boundary high‐beta tokamaks. III. Free‐boundary stability

 

作者: J. P. Goedbloed,  

 

期刊: Physics of Fluids(00319171)  (AIP Available online 1982)
卷期: Volume 25, issue 11  

页码: 2073-2088

 

ISSN:0031-9171

 

年代: 1982

 

DOI:10.1063/1.863698

 

出版商: AIP

 

数据来源: AIP

 

摘要:

Using the techniques of Hilbert transforms and conformal mapping, the stability problem of a toroidal free‐boundary high‐&bgr; tokamak equilibrium with a skin current is reduced to a one‐dimensional problem for which a new variational principle is derived. The minimization is carried out numerically and a complete scan of parameter space is carried out. The stability limit is qualitatively different from the one obtained in the usual fixed‐boundary model without a wall. Rather than a more severe, a less severe limitation on the plasma current is obtained. It is shown that the Kruskal–Shafranov limit may be surpassed when the value of &bgr; is sufficiently high and the wall is sufficiently close to the plasma.

 

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