Error Field Correction in DIII-D Ohmic Plasmas With Either Handedness
Authors: Jong-Kyu Park, Michael J. Schaffer, Robert J. La Haye,Timothy J. Scoville and Jonathan E. Menard
Abstract: Error field correction results in DIII-D plasmas are presented in various configurations. In both left-handed and
right-handed plasma configurations, where the intrinsic error fields become different due to the opposite helical twist
(handedness) of the magnetic field, the optimal error correction currents and the toroidal phases of internal(I)-coils
are empirically established. Applications of the Ideal Perturbed Equilibrium Code to these results demonstrate that
the field component to be minimized is not the resonant component of the external field, but the total field including
ideal plasma responses. Consistency between experiment and theory has been greatly improved along with the
understanding of ideal plasma responses, but non-ideal plasma responses still need to be understood to achieve the
reliable predictability in tokamak error field correction.
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Submitted to: Nuclear Fusion (September 2010)
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Download PPPL-4623 (pdf 2.38 MB 10pp)
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