Optimizing Stellarators for Turbulent Transport
Authors: H.E. Mynick, N.Pomphrey, and P. Xanthopoulos
Abstract:
Up to now, the term \transport-optimized" stellarators has meant optimized to minimize neoclassical transport, while the task of also mitigating turbulent transport, usually the dominant transport channel in such designs, has not been addressed, due to the complexity of plasma turbulence in stellarators. Here, we demonstrate that stellarators can also be designed to mitigate their turbulent transport, by making use of two powerful numerical tools not available until recently, namely gyrokinetic codes valid for 3D nonlinear simulations, and stellarator optimization codes. Two initial proof-of-principle configurations are obtained, reducing the level of ion temperature gradient turbulent transport from the NCSX baseline design by a factor of 2-2.5..
__________________________________________________
Submitted to: Physical Review Letters (May 2010)
__________________________________________________
Download PPPL-4520 (pdf 477 KB 4 pp)
__________________________________________________