A5029915122- Magnetic confinement fusion research
- Fusion materials and technologies
- Nuclear reactor physics and engineering
- Laser-Plasma Interactions and Diagnostics
- Statistical Methods and Inference
- Ionosphere and magnetosphere dynamics
KU Leuven
2020-2024
Abstract Neutral gas physics and neutral interactions with the plasma are key aspects of edge divertor in a fusion reactor including detachment phenomenon often seen as to dealing power exhaust challenges. A full description dynamics requires 6D kinetic approach, potentially time dependent, where details wall geometry play substantial role, extent that, e.g., subdivertor region has be included. The Monte Carlo (MC) approach used for about 30 years EIRENE (Reiter et al 2005 Fusion Sci....
Abstract The neutral atoms in the plasma edge of nuclear fusion devices are typically modeled using either a fluid or kinetic approach. approach is most accurate, but it has two main disadvantages. First, usual solution high-dimensional equation Monte Carlo techniques introduces statistical noise, which hampers convergence coupled plasma-neutral model. Second, computational time strongly increases for highly collisional regimes. For these reasons, deterministic models remain an attractive...
For JET L-mode plasmas in low-recycling conditions (electron temperature at the outer strike point, Te,ot≳30eV), SOLPS-ITER simulations agree within error bars for experimental profiles low-field side (LFS) divertor target. The peak Balmer-α (Dα) emission LFS agrees of KS3 filterscope diagnostic, but is approximately 30% lower than value KT1 spectrometer. Simulations have been performed with fluid, kinetic, and hybrid models neutrals. large fluid-kinetic discrepancies more a factor 2 are...
Abstract In plasma edge transport codes for nuclear fusion devices, fluid‐neutral models offer an interesting alternative to the currently used kinetic Monte Carlo simulations, especially cases of high ion‐neutral collisionality. this paper, we elaborate a separate neutral energy equation in state‐of‐the‐art SOLPS‐ITER code suite, which previously assumed perfect temperature equilibration. Furthermore, study coupled plasma‐neutral solutions range divertor operating regimes, proving validity...
Abstract A spatially hybrid fluid‐kinetic approach for the efficient simulation of plasma‐edge neutrals is extended with a kinetic‐fluid condensation process and an automated to select fluid or kinetic treatment at each point along divertor targets. With proposed methods, dominant charge–exchange reaction can be largely removed from neutral simulation. The methods achieve quantitative agreement standard approach, relative errors on peak target plasma density ion flux 5–30%, while Central...
Abstract Radial anomalous diffusion coefficients are among the largest sources of uncertainty in mean‐field plasma‐edge codes such as SOLPS‐ITER. These machine, scenario, and space‐dependent, thus hampering predictive interpretive capability these codes. In fact, modellers usually adjust manually, based on expert judgement or large, computationally expensive, parameter scans. Matching data from various diagnostics, each with their own experimental uncertainties, additionally complicates...
Abstract A grid refinement study is performed for mean‐field plasma boundary simulations with fluid neutrals in an EU‐DEMO geometry. In general, convergence of the achieved, differences between finest and second‐finest <5% majority quantities interest. The estimated discretization errors original 96 × 36 are mostly 4%–25% range. However, it also shown that exceptions possible due to non‐linear nature codes. Hence, advised regularly perform studies on subsets cases.
The performance of advanced fluid neutral models for the simulation deuterium atoms in plasma edge magnetically confined fusion devices is tested first time on cases that include drifts and currents model, a simplified Alcator C-mod case. unadapted model already gives quantitative agreement, with 5–30% fluid-kinetic discrepancy broad vicinity strikepoint. A new advective perpendicular transport term proposed, which further reduces discrepancies drifts. It also shown ion-neutral current can...
Abstract A new hybrid fluid‐kinetic approach for the hydrogenic neutrals (atoms and molecules) in plasma edge is presented. The combines a fully kinetic model atoms low‐collisional regions near vessel wall, molecules whole domain, with micro–macro originating from recycling at divertor targets, volumetric recombination, dissociation of molecules. With approach, originally scattering‐dominated collision term due to charge‐exchange collisions equation transformed an absorption‐dominated term,...