Bulletin of the American Physical Society
60th Annual Meeting of the APS Division of Plasma Physics
Volume 63, Number 11
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session TP11: Poster Session VII: Basic Plasma Physics: Pure Electron Plasma, Strongly Coupled Plasmas, Self-Organization, Elementary Processes, Dusty Plasmas, Sheaths, Shocks, and Sources; Mini-conference on Nonlinear Waves and Processes in Space Plasmas - Posters; MHD and Stability, Transients (2), Runaway Electrons; NSTX-U; Spherical Tokamaks; Analytical and Computational Techniques; Diagnostics (9:30am-12:30pm)
Thursday, November 8, 2018
OCC
Room: Exhibit Hall A1&A
Abstract ID: BAPS.2018.DPP.TP11.133
Abstract: TP11.00133 : A comparison of NIMROD's continuum and delta-f PIC approaches to energetic particle physics*
Presenter:
Trevor Taylor
(Utah State University)
Authors:
Trevor Taylor
(Utah State University)
J. Andrew Spencer
(Utah State University)
Scott E Kruger
(Tech-X Corp)
Eric Held
(Utah State University)
Small number of energetic ions can have effect on long-wavelength modes in magnetized fusion [1]. PIC models have been used to model 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. Two advantages of the continuum EP implementation are 1) the advance of the DK and flow evolution equations can be made fully implicit using Picard iterations within a single time step, and 2) a finite-element approach in pitch-angle resolves trapped/passing physics in velocity space. The continuum and delta-f methods are compared using model of giant sawtooth cycles in DIII-D shot \#96043. In this discharge, energetic ions are driven by RF and modifies the sawtooth stability. We present results from linear calculations that compare the accuracy and efficiency of the continuum and delta-f PIC methods using the slowing-down part of the EPs.
[1] W. Park, S. Parker, et al., Physics of Fluids B: Plasma Physics 4, 2033 (1992).
[2] C. C. Kim, C. R. Sovinec, et.al., Comp. Physics Communications 164, 448 (2004).
*DOE under grant nos. DE-FC02-08ER54973, DE-FG02-04ER54746, and DE-SC0018146.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.TP11.133
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