Abstract Details
Abstracts
Author: Manaure Francisquez
Requested Type: Poster
Submitted: 2025-03-14 16:34:37
Co-authors: T. N. Bernard, G. Johnson, A. Hakim, G. W. Hammett
Contact Info:
Princeton Plasma Physics Laboratory
63 E Wheelock St
Princeton, NJ 08540
United States
Abstract Text:
The scrape-off layer (SOL) of a tokamak with plasma facing components (PFCs) covered in liquid Lithium (Li), such as the Lithium Tokamak eXperiment (LTX-beta), can be very hot as the recycling process that introduces low temperature ions near the wall is arrested by Li’s affinity for hydrogenic ions. These high temperature SOLs can exhibit strong kinetic effects, such as the presence of a large trapped particle population. The trapped fraction was upwards of 80% in previous 1D gyrokinetic simulations [1] of the LTX-beta SOL [2], which modeled a low recycling scenario produced with freshly coated PFCs (with Li) simply employing the electron and ion parameters of the SOL, but the model did not actually self-consistently incorporate the recycling process happening at the wall. In this work we present a new study in which recycling is modeled directly [3]. We examine how the inclusion of a recycling process near the wall, and the introduction of cold ions therein, pushes the SOL away from a kinetic regime and into a fluid one. We explore the characteristics of this process and how it scales with the recycling coefficient.
[1] The Gkeyll code, https://gkeyll.readthedocs.io/.
[2] A. Maan, et. al. Phys. Plasmas 31, 022505 (2024).
[3] T. N. Bernard, et al. Phys. Plasmas 29, 052501 (2022).
Characterization: 2.0
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