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Abstract

The beta limits on ballooning and Mercier stability have been calculated for 5-period linked-mirror stellarators (LMS) using the TERPSICHORE code. These are helical systems with a dominant (m = 0, n = 1) toroidal Fourier component of the magnetic field strength in Boozer coordinates, where m is the poloidal mode number and n is the toroidal mode number per period. The results of the LMS were compared for two types of plasma shape geometry. The Heliac configuration is where the magnetic surface cross-section rotates simultaneously with the principal normal with respect to the magnetic axis. The beta limit with respect to ballooning modes for Heliac LMS equals 5.91 % and the Mercier criterion is stable up to beta = 6.15 % with a broad prescribed parabolic pressure profile p(s) = p(0)(1 � s). The Helias configuration is where the magnetic surface cross-section lags behind the principal normal with respect to the magnetic axis. The beta limit with respect to ballooning modes for Helias LMS approaches 5.1 % and the Mercier criterion is stable at the level of 6 % with a peaked prescribed pressure profile p(s) = 0.2p(0)(3(1-s){2} + 2(1 � s){3}). The results highlight the potential advantages of LMS devices as compact systems with high beta and possibly low neoclassical transport.

Additional information

Authors: ISAEV M Y, Nuclear Fusion Institute, Russian Research Centre Kurchatov Institute, Moscow (RU);SHAFRANOV V D, Nuclear Fusion Institute, Russian Research Centre Kurchatov Institute, Moscow (RU);COOPER W A, Centre de Recherches en Physique de Plasmas, Association Euratom, Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: 1998 International Congress on Plasma Physics, 25th EPS Conference on Controlled Fusion and Plasma Physics, Prague (CZ), June 29 � July 3, 1998
Record Number: 199811266 / Last updated on: 1998-10-27
Category: PUBLICATION
Original language: en
Available languages: en