High-[Formula presented] Equilibria of Drift-Optimized Compact Stellarators

A. S. Ware, S. P. Hirshman, D. A. Spong, L. A. Berry, A. J. Deisher, G. Y. Fu, J. F. Lyon, R. Sanchez

Research output: Contribution to journalArticlepeer-review


Compact stellarator configurations have been obtained with good neoclassical confinement that are stable to both pressure- and current-driven modes for high values of [Formula presented]. These configurations are drift-optimized tokamak-stellarator hybrids with a high-shear tokamak-like rotational transform profile and [Formula presented] that is approximately poloidally symmetric. The bootstrap current is consistent with the required equilibrium current and, while larger than that in existing stellarators, is typically only a small fraction ([Formula presented]) of that in an equivalent tokamak. These configurations have strong magnetic wells and consequently high interchange stability [Formula presented] limits up to [Formula presented]. Because of the reduced bootstrap current, these configurations are stable to low-[Formula presented] ideal MHD kink modes with no wall stabilization for values of [Formula presented] ([Formula presented]) significantly larger than in an equivalent advanced tokamak.

Original languageEnglish
JournalPhysical Review Letters
Issue number12
StatePublished - 2002


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