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: PP11.00072 : Results from integrated modeling of RF-induced ponderomotive effects on edge/SOL transport*
Presenter:
David N Smithe
(Tech-X Corp)
Authors:
David N Smithe
(Tech-X Corp)
Thomas G Jenkins
(Tech-X Corporation)
Maxim Umansky
(Lawrence Livermore Natl Lab)
Andris M Dimits
(Lawrence Livermore Natl Lab)
Thomas D Rognlien
(Lawrence Livermore Natl Lab)
We look at a 2D poloidal plane model, with an antenna strap and box for the RF, and tokamak H-mode diverter scrape-off layers for the transport timescale. We review how different terms can dominate for ions and electrons, in particular, with electrons seeing a gradient-density term that can dominate for the typical steep H-mode pedestal density profiles. We also highlight how the ponderomotive forces are dominated by the strong fields at the corners of the antenna box.
In NSTX-like scenarios with experimentally realistic plasma profiles and antenna parameters, we observe that the ponderomotive contribution to parallel electron momentum is comparable to or larger than other edge transport processes, for representative RF input power fluxes. This parallel momentum source transports density away from the region immediately in front of the RF antenna, necessitating an iteration between the RF and Transport codes, in order to converge to an RF-perturbed equilibrium. We discuss details and difficulties of this iteration process.
*This work is supported by the U.S. Department of Energy's Office of Fusion Energy Sciences in connection with the RF SciDAC , under contracts DE-AC52-07NA27344 (LLNL), FWP-2017-LLNL-SCW1619 (LLNL), and DE-SC0018319.
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