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(THP1/07) MHD Stability Calculations of High-$\beta$ Quasi-Axisymmetric Stellarators

G. Y. Fu, L. P. Ku, N. Pomphrey, M. Redi, C. Kessel, D. Monticello, and A. Reiman

Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ 08543, U.S.A.

M. Hughes

Northrup-Grumman Corporation, Princeton, New Jersey, USA

W. A. Cooper

Center of Research for Plasma Physics, Lausanne, Switzerland

C. Nührenberg
IPP, Greifswald, Germany

Abstract.  The MHD stability of quasi-axisymmetric compact stellarators is investigated. It is shown that bootstrap current driven external kink modes can be stabilized by a combination of edge magnetic shear and appropriate 3D plasma boundary shaping while maintaining good quasi-axisymmetry. The results demonstrate that there exists a new class of stellarators with quasi-axisymmetry, large bootstrap current, high MHD beta limit, and compact size.

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