Determination of the Noninductive Current Profile in Tokamak Plasmas

C. B. Forest; K. Kupfer; T. C. Luce; P. A. Politzer; L. L. Lao; M. R. Wade; D. G. Whyte; D. Wròblewski

doi:10.1103/PhysRevLett.73.2444

Determination of the Noninductive Current Profile in Tokamak Plasmas

C. B. Forest, K. Kupfer, T. C. Luce, P. A. Politzer, L. L. Lao, M. R. Wade, D. G. Whyte, and D. Wròblewski

Phys. Rev. Lett. 73, 2444 – Published 31 October 1994

Abstract

The noninductive part of the measured current profile has been determined for DIII-D plasmas. A technique for determining the flux surface average of the quantity $E \cdot B$ and a model for the resistivity separates the current profile into inductive and noninductive portions. Analysis shows directly that neoclassical resistivity is adequate to explain the experimental observations, while Spitzer resistivity is not, and that a large noninductive current exists in plasmas for which large neutral beam current drive and pressure driven bootstrap currents are expected.

Received 19 May 1994

DOI:https://doi.org/10.1103/PhysRevLett.73.2444

Authors & Affiliations

C. B. Forest, K. Kupfer^*, T. C. Luce, P. A. Politzer, L. L. Lao, M. R. Wade^†, D. G. Whyte^‡, and D. Wròblewski^§

General Atomics, San Diego, California 92186-9784

^*Permanent address: Oak Ridge Institute for Science and Education Fellow at General Atomics.
^†Permanent address: Oak Ridge National Laboratory, Oak Ridge, Tennessee.
^‡Permanent address: Centre Canadien de Fusion Magnétique, Varennes, Québec, Canada.
^§Permanent address: Lawrence Livermore National Laboratory, Livermore, California.