Near-field models and simulations of pellet ablation in tokamaks

Bosviel, Nicolas; Parks, Paul; Samulyak, Roman

doi:10.1063/5.0029721

Near-field models and simulations of pellet ablation in tokamaks

Journal Article · Tue Jan 12 00:00:00 EST 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0029721· OSTI ID:1755145

Bosviel, Nicolas ^[1]; ^[2]; ^[3]

Stony Brook Univ., NY (United States)
General Atomics, San Diego, CA (United States)
Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Here, detailed numerical studies of the ablation of a single neon pellet in the plasma disruption mitigation parameter space have been performed. Simulations were carried out using FronTier, a hydrodynamic/low magnetic Reynolds number MHD code with explicit tracking of material interfaces. FronTier's physics models resolve the pellet surface ablation and the formation of a dense, cold cloud of ablated material, the deposition of energy from hot plasma electrons, the expansion of the ablation cloud along magnetic field lines, and the radiation losses. A local thermodynamic equilibrium model based on Saha equations has been used to resolve atomic processes in the cloud and Redlich–Kwong corrections to the ideal gas equation of state for cold and dense gases, which have been used near the pellet surface. The FronTier pellet code is a next generation of the code described. It has been validated against the semi-analytic improved neutral gas shielding model in the 1D spherically symmetric approximation. Main results include quantification of the influence of atomic processes and Redlich–Kwong corrections on the pellet ablation in spherically symmetric approximation and verification of analytic scaling laws in a broad range of pellet and plasma parameters. Using axially symmetric MHD simulations, the properties of ablation channels and the reduction of pellet ablation rates in magnetic fields of increasing strength have been studied. While the main emphasis has been given to neon pellets for the plasma disruption mitigation, selected results on deuterium fueling pellets have also been presented.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: SC0012704

OSTI ID:: 1755145

Alternate ID(s):: OSTI ID: 1759081

Report Number(s):: BNL--220757-2020-JAAM

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 28; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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