Abstract Details
Abstracts
Author: Chenhao Ma
Requested Type: Poster
Submitted: 2019-02-23 12:38:23
Co-authors: E.A. Startsev, P. Porazik, W. Wang, J. Chen and S. Ethier
Contact Info:
Princeton Plasma Physics Laboratory
100 Stellarator Road
Princeton, NJ 08540
USA
Abstract Text:
We report the recent development in the electromagnetic simulations capability for general toroidal geometry based on the global particle-in-cell gyrokinetic code GTS. Because of the cancellation problem, the gyrokinetic simulation with electromagnetic perturbations has numerical difficulties in the MHD limit where plasma beta is larger than mass ratio. We utilize a modified p|| formulation with time integral of E|| used in place of A|| [Mishichenko, PoP (2014)]. The time integral of E|| is solved directly using the Ampere’s Law. The original Mischichenko scheme suffers from the effects of numerical noise due to particle discreteness. To cure it, we have devised a new noise correcting scheme that removes particle noise from both the electron density and the electron current, which is the extension of Chen’s noise reduction scheme [Chen, JCP (2003)] to the higher order. With the new scheme our simulations correctly reproduce the finite beta stabilization effect of ion temperature gradient mode (ITG) and the onset of kinetic ballooning mode (KBM) for the Cyclone Base Case parameters. We also present our recent simulations of ITG to TEM transition which are made possible with newly developed gyrokinetic Poisson solver which utilizes the Pade approximation.
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