Publications Details

Study of the impact of resonant magnetic perturbation fields on gross tungsten erosion using DiMES samples in DIII-D

Hinson, E.T.; Schmitz, O.; Wampler, William R.; Frerichs, H.; Abrams, T.; Briesemeister, A.; Rudakov, D.L.; Unterberg, E.A.; Watkins, Jonathan G.; Wang, H.Q.

An experiment was conducted in DIII-D to compare gross tungsten (W) erosion on samples exposed to outer strike point (OSP) sweeps in L-mode plasmas for three conditions. These included two phases of resonant magnetic perturbations (RMPs), and a set with no perturbations. Upon RMP application, lobe structures indicative of strike point splitting of the OSP were evident in divertor camera data and on Langmuir probes. Gross W erosion flux, GW, inferred spectroscopically using the S/XB method applied to the 400.9 nm W-I line, was generally in the range ΓW/ΓD +,⊥ = 2 × 10-4 referenced to incident deuterium ion flux ΓD+,⊥, and was increased in the RMP cases by no more than 30% of the level observed in unperturbed discharges. A large reduction in gross erosion (50%) was observed in the private flux region at the W sample for one specific toroidal phase of the RMP field.