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The saturation of the neoclassical tearing requires the mathing index Delta' to be large and negative. In the international thermonuclear experimental reactor (ITER), the combination of neoclassical bootstrap current drive with Delta' < 0, but small for low m/n modes, is predicted to give rise to large neoclassical islands which may impact on the soft beta limit. To control the size of these islands, a proposal is made to apply a continuous, localized current drive about the rational surface. However, contrary to the first two references cited, it is found that the dominant stabilizing effect does not come from replacing the bootstrap current within the island, but rather from the large and negative Delta' values obtained by tailoring the current profile.

Additional information

Authors: PLETZER A, ITER-JCT, La Jolla (US);PERKINS F, ITER-JCT, La Jolla (US)
Bibliographic Reference: Article: 1998 International Sherwood Fusion Theory Conference (1998), 1p.
Record Number: 199810671 / Last updated on: 1998-05-26
Original language: en
Available languages: en