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Author: Manaure Francisquez
Requested Type: Poster
Submitted: 2019-02-22 17:46:39
Co-authors: N.Mandell, A.Hakim, T.Bernard, G.W.Hammett
Contact Info:
MIT Plasma Science and Fusion Center
77 Massachusetts Avenue, NW17
Cambridge, MA 02139
USA
Abstract Text:
Continuum electromagnetic simulation of an Alcator C-Mod low-triangularity L-mode scrape-off-layer (SOL) is pursued with the Gkeyll framework. A reference Ohmic shot with a well diagnosed SOL, including profile and fluctuation data from mirror Langmuir probes, is chosen. Simulations of this case are used to assess the current fidelity of Gkeyll’s long-wavelength electromagnetic gyrokinetic model with a simplified model magnetic geometry of the SOL. This gyrokinetic model uses a newly improved model collision operator for both self-species and cross-species collisions that is both exactly conservative and, in the limit of infinite velocity space, entropy producing independently of resolution. We examine the evolution of global profiles, heat fluxes and flow structure. Similar numerical investigations have been carried out with fluid codes in the past [1,2] and initial comparisons will be discussed.
[1] Francisquez, M., Zhu, B., & Rogers, B. N. (2017a). Global 3D Braginskii simulations of the tokamak edge region of IWL discharges. Nucl. Fusion, 57(11).
[2] Halpern, F. D., Terry, J. L., Zweben, S. J., LaBombard, B., Podesta, M., & Ricci, P. (2015). Comparison of 3D flux-driven scrape-off layer turbulence simulations with gas-puff imaging of Alcator C-Mod inner-wall limited discharges. Plasma Phys. Control. Fusion, 57(5), 054005.
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