Author: Robert Hager
Requested Type: Poster
Submitted: 2017-03-17 17:53:25
Co-authors: C. S. Chang, R. Nazikian, N. Ferraro
Princeton Plasma Physics Laboratory
100 Stellarator Road
Princeton, New Jersey 08540
The gyrokinetic neoclassical, total-f, particle-in-cell code XGCa is utilized to study neoclassical heat and particle fluxes induced by resonant magnetic perturbations (RMP) on a DIII-D H-mode plasma in the steep pedestal region. Compared to the earlier efforts by G. Y. Park et al., [Phys. Plasmas 17, 102503 (2010), APS invited talk, Bull. Am. Phys. Soc. 56 (2011)] using the guiding center code XGC0, the gyrokinetic code XGCa adds important new capabilities to the study, such as poloidal potential variation, fully nonlinear collision operation, and more realistic gyro-viscosity, which enhance the fidelity of the simulation in the H-mode pedestal and the scrape-off layer. For this study, we first use static vacuum 3D field perturbations and M3D-C1 calculated screened perturbations, and compare the results. Due to kinetic 3D effects and the self-consistent treatment of radial and poloidal electric fields in XGCa, our simulations exhibit large density and electron heat transport at the pedestal top despite the presence of KAM surfaces. Kinetic plasma current response is much broader spatially than the MHD current response. The RMP induced heat and particle fluxes are found to be much larger than the neoclassical fluxes obtained in purely axisymmetric field. The first results from XGCa simulations of the kinetic plasma response and self-consistent RMP field penetration using a reduced MHD solver show somewhat different plasma-screened magnetic perturbations from the M3D-C1 result.
Work supported by US DOE FES and ASCR under Contracts DE-AC02-09CH11466, DE-FC02-04ER54698. Computing resources are provided by ALCF and NERSC.