April 4-6

Abstract Details

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Author: Wenhao Wang
Requested Type: Poster
Submitted: 2022-03-03 11:56:15

Co-authors: X. S. Wei, Z. Lin, S. Dettrick, C. Lau, T. Tajima

Contact Info:
University of California, Irvine
4055A Frederick Reines Hall, U
Irvine, CA   92697
United States

Abstract Text:
The electrostatic presheath potential in the SOL of FRC device could affect the turbulent transport in the SOL and the penetration of divertor biasing to the FRC confinement region. Full-f gyrokinetic simulation is needed to find the SOL equilibrium, which is intrinsically 2D resulting from the balance between radial and parallel transport. We have formulated an electrostatic simulation model for the SOL presheath and implemented in the GTC-X code. The model has first been verified in a 1D presheath simulation on a single flux surface by recovering the parallel force balance and continuity equation. To further construct a 2D presheath, different radial boundary conditions and simulation domain size have been tested. With the absence of radial coupling between flux surfaces such as realistic radial resistivity, the radial electric field profile is mainly determined by the radial boundary condition. Effects of radial resistivity will be incorporated in the simulations to determine a more realistic 2D structure of the presheath potential. By including the 2D presheath as background time-independent equilibrium, we have carried out microturbulence simulation in the FRC SOL and found that the radial electric field of the presheath can reduce the ITG instability by providing a large E×B shearing rate.