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Stability of elongated cross‐section tokamaks to axisymmetric even poloidal mode number deformations

 

作者: R. Weiner,   S. C. Jardin,   N. Pomphrey,  

 

期刊: Physics of Fluids B: Plasma Physics  (AIP Available online 1989)
卷期: Volume 1, issue 12  

页码: 2349-2352

 

ISSN:0899-8221

 

年代: 1989

 

DOI:10.1063/1.859054

 

出版商: AIP

 

数据来源: AIP

 

摘要:

In a recent paper, Nakayama, Sato, and Matsuoka [Phys. Fluids31, 630 (1988)] suggested that elliptical cross‐section tokamaks with aspect ratioR/a=3.2 and with elongation &kgr;=2.6 are unstable to a splitting (m=2,n=0) instability for plasma &bgr;>5%, and that &kgr;≥4.0 plasmas are unstable to a splitting for &bgr;≥1%. The magnetohydrodynamic evolution codetsc[J. Comput. Phys.66, 481 (1986)] indicates, however, that such plasmas are robustly stable with respect to this splitting. In fact, a &kgr;=3.7 plasma with &bgr;=23.0% shows no tendency to split. However, the addition of pinching coils at the waist will cause the plasma to split if the current in these coils exceeds a critical valueIc, which decreases with increasing beta.

 

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