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 GP12: Poster Session III:
Low Temperature Plasmas
Fundamental Plasma Physics I: computation, boundaries
Fundamental Plasma Physics II: dusty, diagnostics
MFE Measurement and Diagnostics Techniques, Technology, and Edge and Pedestal Physics
9:30 AM - 12:30 PM
Tuesday, October 8, 2024
Hyatt Regency
Room: Grand Hall West
Abstract: GP12.00135 : Advances in the Theory of Heat Load Broadening by Turbulence*
Presenter:
Patrick H. Diamond
(University of California, San Diego)
Authors:
Patrick H. Diamond
(University of California, San Diego)
Mingyun Cao
(UCSD)
The phenomenon of heat load broadening by edge and pedestal turbulence is now well established, and illustrates the benefits of a somewhat turbulent pedestal. In this paper, we report on recent advances in the theory of heat load broadening by turbulence spreading. In particular:
a)We demonstrate that an effective maximal layer broadening exists, beyond which, locally produced SOL turbulence is excited. This can invade the pedestal and so degrade confinement.
b)There is a synergy between spreading and heat flux, such that the coupling of intensity flux drive and heat flux drive can reinforce the SOL broadening process. In particular, spreading can trigger the local extraction of free energy from the heat flux. This reinforces the need for flux-driven simulation studies.
c)Related to (b), heat avalanching is a natural spreading mechanism, which can directly broaden the heat load.
We also discuss unavoidable trade-offs between SOL broadening and confinement.
*Supported by DOE
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