April 15-17

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Abstracts

Author: Trevor V Taylor
Requested Type: Poster
Submitted: 2019-02-21 14:00:51

Co-authors: E.D.Held, S.E.Kruger, J.A.Spencer

Contact Info:
Utah State University
Old Main Hill
Logan, UT   84322
United States

Abstract Text:
A small number of energetic ions can effect long-wavelength modes in magnetized fusion plasmas. PIC models have been used to capture this interaction in the context of initial value codes. The extended MHD code NIMROD has both continuum and delta-f PIC [2] drift kinetic (DK) capabilities that incorporate the energetic particle (EP), anisotropic stress tensor into its flow evolution equation. Higher order shape functions have been implemented in the delta-f PIC DK approach in an attempt to reduce the inherent noise in the deposition of particle information onto NIMROD's higher-order finite element grid. The continuum and delta-f methods are compared in simulations of giant sawtooth cycles in DIII-D shot #96043. In this discharge, energetic ions are driven by RF thus modifying the sawtooth stability [2]. We present the linear calculations, including the results for bi-linear and bi-quadratic shape functions, and compare the accuracy and efficiency with the continuum method.
[1] C. C. Kim, C. R. Sovinec, et.al., Comp. Physics Communications 164, 448 (2004).
[2] M. Choi, A. D. Turnbull, V. S. Chan, M. S. Chu, L. L. Lao et. al., Phys. Plasmas 14, 112517 (2007).

Comments:
Computer Simulation of Plasmas