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The stability of test equilibrium relevant to the International Thermonuclear Experimental Reactor [Fusion Eng. Des. 36, 9 (1997)] has been studied within the framework of the neoclassical island theory. The most unstable modes, with the most positive matching index delta', have been found by solving the toroidal stability equation to have 3/2, 2/1, and 4/3 helicities. Quasilinear effects resulting from the flattening of the current profile as the island develops are important and stabilising. Large saturated islands are predicted to arise from a combination of strong bootstrap current drive and weakly negative delta'. The island size can be significantly reduced by applying a continuous current drive at the unstable rational surfaces. The so-obtained reduction of island width is approximately proportional to the current drive and inversely proportional to the square of the current channel. This stabilisation relies on the removal of the free energy in the outer region and can thus be regarded as a delta' effect.

Additional information

Authors: PLETZER A, Centre de Recherches en Physique des Plasmas, Association Euratom - Confédération Suisse, Lausanne (CH);PERKINS F W, ITER-JCT, California (US)
Bibliographic Reference: An article published in: Physics of Plasmas, Volume 6, Issue 5, May 1999, pp. 1589-1600.
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