April 4-6

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Author: Noah R Mandell
Requested Type: Poster
Submitted: 2022-03-03 20:08:37

Co-authors: W. Dorland, I. Abel, N. Barbour, B. Buck, S. Fischer, R. Gaur, B. Jiang, R. Jorge, P. Kim, M. Landreman, M. Martin, M. Nastac, T. Qian, C. Sipling, T. Taylor

Contact Info:
18 Wright St
North Reading, MA   01864

Abstract Text:
The GX code [Mandell, et al, JPP 2018] is a GPU-native radially-local delta-f gyrokinetic turbulence code that uses pseudo-spectral methods in both configuration and velocity space. At high resolution GX is a standard gyrokinetic code, but it can also be successfully run at low resolution (particularly in velocity space) in lieu of uncontrolled approximations, since in the lowest-resolution limit the system corresponds to established gyrofluid models [Beer, et al, PoP 1996]. GX requires, for example, less than 30 seconds to compute the correct Cyclone base case heat flux for ITG turbulence on a desktop computer with an appropriate GPU card. We present this and other linear and nonlinear ITG and ETG turbulence benchmarks against standard codes from the community, for both tokamak and stellarator configurations.

GX has also been coupled to the Trinity transport solver [Barnes, et al, PoP 2010]. Trinity uses a multi-scale approach to solve for the time-dependent radial profiles of density, temperature, etc, with turbulent fluxes obtained from GX calculations, neoclassical fluxes obtained from a drift kinetic solver, external sources, and edge boundary conditions supplied by the user. Using the Trinity+GX system, we demonstrate the ability to solve for the time-dependent evolution of core fusion reactor profiles in approximately real time, without resorting to reduced models.

Please group abstracts by (although I am not sure if all of these people will submit abstracts):
1. N. Mandell
2. T. Qian
3. S. Fischer
3. P. Kim
4. B. Buck
5. R. Gaur
6. N. Barbour