Abstract Details
| status: | file name: | submitted: | by: |
|---|---|---|---|
| approved | parisi_sherwood_2023.pdf | 2023-03-24 16:16:26 | Jason Parisi |
Abstracts
Author: Jason F Parisi
Requested Type: Consider for Invited
Submitted: 2023-03-24 16:08:53
Co-authors: W. Guttenfelder, A. O. Nelson, G. Avdeeva, C. Clauser, M. Curie, A. Diallo, R. Gaur, A. Kleiner, M. Lampert, J. McClenaghan
Contact Info:
Princeton Plasma Physics Laboratory
100 Stellarator Road
Princeton, NJ 08542-0451
USA
Abstract Text:
Using a new kinetic ballooning mode (KBM) gyrokinetic threshold model, GKPED, we find the pedestal width-height scaling for multiple tokamaks. At tight aspect ratio, GKPED reproduces NSTX’s experimental linear pedestal width-height scaling for ELMy H-modes [1], overcoming previous issues with tight aspect ratio pedestal prediction [2]. At regular aspect ratio, we reproduce the square root pedestal width-height scaling for previously published DIII- D discharges [3]. Our model uses EFIT [4] to calculate global equilibria with self-consistent bootstrap current, and can be applied to any H-mode equilibria. For ELMy NSTX discharges, KBM physics is needed to match the experimental data: we find that infinite-n MHD stability overpredicts pedestal pressure. For regular aspect ratio, however, we find closer agreement between ideal and kinetic ballooning mode width scalings. Combined with peeling ballooning mode (PBM) stability [5,6], our model will calculate a maximum inter-ELM pedestal width and height based on KBM and non-ideal PBM stability. GKPED also makes quasilinear predictions for turbulent pedestal transport during pedestal evolution including the effects of increasing pressure with varying temperature and density contributions. This work is an important step forward towards a unified predictive capability of pedestal stability and transport across tokamak equilibria across a range of tokamak operating space.
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