Marginal stability diagrams for infinite-n ballooning modes in quasi-symmetric stellarators

S. R. Hudson, C. C. Hegna, R. Torasso, A. Ware

Research output: Contribution to journalArticlepeer-review

Abstract

The influence of the pressure and rotational transform gradients on the local shear, which in turn influences the ballooning stability, is described. Stability diagram for the quasi-axially symmetric NCSX, a quasi-poloidally symmetric configuration and the quasi-helically symmetric HSX are compared. Regions of stability are observed in both NCSX and the quasi-helically symmetric device. The results show that the ballooning stability results when the local shear is small in regions of bad curvature with sufficient pressure gradient.

Original languageEnglish
Pages (from-to)869-876
Number of pages8
JournalPlasma Physics and Controlled Fusion
Volume46
Issue number5
DOIs
StatePublished - May 2004

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