Observation of Peak Neoclassical Toroidal Viscous Force in the DIII-D Tokamak

摘要

Observation of a theoretically predicted peak in the neoclassical toroidal viscosity (NTV) force as a function of toroidal plasma rotation rate Ω is reported. The NTV was generated by applying n = 3 magnetic fields from internal coils to low Ω plasmas produced with nearly balanced neutral beam injection. Locally, the peak corresponds to a toroidal rotation rate Ω_0 where the radial electric field E_r is near zero as determined by radial ion force balance.