6 papers
Machine Learning approach to modeling of neutral particles transport in plasma
M. V. Umansky, G. J. Parker, R. D. Smirnov
A propagator-based approach is investigated for Monte-Carlo (MC) modeling of neutral particles transport in fusion boundary plasmas. The propagator is essentially a Green function…
A Propagator-based Multi-level Monte Carlo Method for Kinetic Neutral Species in Edge Plasmas
Gregory J. Parker, Maxim V. Umansky, Benjamin D. Dudson
We propose and investigate a new multi-level Monte Carlo scheme for numerical solutions of the kinetic Boltzmann equation for neutral species in edge plasmas. In particular, this m…
Modeling of convective cells, turbulence, and transport induced by a radio-frequency antenna in the tokamak boundary plasma
M. V. Umansky, B. D. Dudson, T. G. Jenkins +2
The edge turbulence model Hermes (Dudson et al., 2017 Plasma Phys. Control. Fusion 59 05401) is set up for plasma boundary simulations with an RF antenna, using parameters characte…
Simulations of the churning mode: toroidally symmetric plasma convection and turbulence around the X-points in a snowflake divertor
D Power, M V Umansky, V A Soukhanovskii
Using a reduced MHD model, extended to include field-aligned thermal conduction, we present numerical simulations of the churning mode (CM): a toroidally symmetric, non-linear plas…
Coupling Fluid Plasma and Kinetic Neutral Models using Correlated Monte Carlo Methods
Gregory J. Parker, Maxim V. Umansky, Benjamin D. Dudson
While boundary plasmas in present-day tokamaks generally fall in a fluid regime, neutral species near the boundary often require kinetic models due to long mean-free-paths compared…
Analysis of high-field side plasma instabilities in tokamak edge
Maxim V. Umansky
Balanced double-null configurations are of general interest for boundary plasma physics, and they have been proposed for some future designs. Experimental observations demonstrate…