Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session PP11: Poster Session VI: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
MFE: Diagnostics; Edge and Pedestal; Stability; Heating; Transport, Turbulence
ASTRO: Astrophysical Plasma
2:00 PM - 5:00 PM
Wednesday, October 19, 2022
Room: Exhibit Hall A and Online
Abstract: PP11.00073 : Noise-free large-timestep RF plasma modeling with the spider stencil*
Presenter:
Carl Bauer
(Tech-X Corp)
Authors:
Carl Bauer
(Tech-X Corp)
John R Cary
(University of Colorado, Boulder)
Thomas G Jenkins
(Tech-X Corporation)
David N Smithe
(Tech-X Corp)
algorithm for simulating cold magnetized plasmas where the maximum timestep is
limited only by the Courant condition for RF waves [1]. We can
therefore model transient phenomena on slow time-scales such as ion
cyclotron and lower-hybrid resonances without needing to resolve fast
electron dynamics, and the simulations are numerically stable.
The algorithm applies to low-amplitude waves in cold magnetized plasmas,
such as the interaction of RF heating pulses with a tokamak edge plasma.
Our current implementation is an improvement over the algorithm described
in [1]---with a set of careful field interpolation steps, we avoid
applying any spatial smoothing operators and therefore free our simulations
from any unphysical low-frequency short-wavelength modes.
We have implemented the algorithm in Vorpal [2], and present results that
validate the physics, demonstrate numerical stability despite unresolved
electron dynamics, and benchmark performance on CPUs and GPUs.
[1] David N. Smithe, Finite-difference time-domain simulation of fusion plasmas at radiofrequency time scales, Physics of Plasmas 14, 056104 (2007)
[2] C. Nieter and J. Cary. 2004. VORPAL: a versatile plasma simulation code. J. Comput. Phys. 196, 2, 448-473.
*SciDAC grant DE-SC0018319
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