Bulletin of the American Physical Society
66th Annual Meeting of the APS Division of Plasma Physics
Monday–Friday, October 7–11, 2024; Atlanta, Georgia
Session GO05: MFE:Self-Organised Plasmas & Magnetic Mirrors
9:30 AM–12:30 PM,
Tuesday, October 8, 2024
Hyatt Regency
Room: Hanover C
Chair: William Young, Zap Energy
Abstract: GO05.00013 : Beta stabilization and Zonal flows in PI3 Plasmas at General Fusion *
11:54 AM–12:06 PM
Presenter:
Neeraj Kumar
(General Fusion Inc., Richmond, Canada)
Authors:
Neeraj Kumar
(General Fusion Inc., Richmond, Canada)
Galina Avdeeva
(General Atomics - San Diego)
Meritt Reynolds
(General Fusion Inc.)
Jeff Candy
(General Atomics)
Gary M Staebler
(Oak Ridge National Laboratory)
Emily A Belli
(General Atomics)
Colin P McNally
(General Fusion)
Linear and ion scale nonlinear (NL) gyrokinetic flux tube simulations are performed for PI3 shot 18669 at radial locations r/a=0.60, 0.65, 0.70, and 0.75, using the gyrokinetic code CGYRO [J Candy et al., JCP 324, 73 (2016)]. Linear simulations indicate that the dominant modes are ITG in the ion-scale range. Linearly, plasma beta stabilizes dominant mode growth rates below the KBM critical beta threshold. In the NL regime, turbulent heat fluxes are driven mostly by long wavelength ITG modes, whereas TEM modes are suppressed due to high collisionality. NL beta stabilization of plasma turbulence was found at r/a=0.60 and r/a=0.65, consistent with linear beta stabilization behaviour. Moreover, strong self-regulated zonal flows are observed in these plasmas. TGLF [G Staebler et al., PoP 14, 055909 (2007) ], a reduced quasilinear code, is compared to the NL results. Preliminary analysis indicates that the SAT2 model overpredicts turbulent heat flux significantly compared to CGYRO at all radii. SAT1 performs better than SAT2 but still overestimates/underestimates the heat fluxes at the inner/outer radii. However, CGYRO agreement with SAT1 improves at inner radii when the beta and collisionality are reduced by a factor of two.
*Parts of this research used resources of the Oak Ridge Leadership Computing Facility, which is a DOE Office of Science User Facility supported under Contract DE-AC05-00OR22725.
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