Penalization technique to implement plasma facing wall-components with complex geometries in fluid simulations of the edge plasma

International audienceno abstrac

Near wall plasma simulation using penalization technique with the transport code Soledge2D-EIRENE

International audienceIn order to model plasma interaction with full complexity of the geometry of PFCs, an immersed method to impose boundary conditions has been implemented in the transport code SolEdge2D. This penalization technique has proven to properly recover Bohm boundary conditions, including supersonic solutions at the sheath entrance. The role of the ionization source has been taken into account by coupling SolEdge2D with the 3D kinetic neutral code Eirene. Density regimes are properly recovered and major differences between core located and divertor located ionization source regimes are emphasized. One also presents main chamber wall recycling regime simulations that can now be addressed with simulations of the entire edge plasma up to the wall

Impact on Divertor Operation of the Pattern of Edge and SOL Flows Induced by Particle Sources and Sinks

International audienceno abstrac

Divertor imbalance and divertor density regimes for ballooned cross-field turbulence

International audienceThe ballooned nature of cross-field transport is shown to govern the steady state divertor imbalance of the energy flux leading to a factor 10 between the low field side and high field energy flux. An even stronger ratio is found for the divertor temperatures. Conversely the particle flux is expected to be a factor 10 larger on the high field side than on the low field side. The transition to detachment, close to divertor thermal collapse, exhibits several constraints to maintain steady state solutions. These constraints, related in particular to a large drop of the divertor density upon detachment, are shown to strongly correlate the pressure and particle flux variation along the field line and consequently the various loss channels. This delicate balance between different mechanisms is a possible understanding of the difficulty reported in detached plasma operation and simulation

Divertor imbalance and divertor density regimes for ballooned cross-field turbulence

International audienceno abstrac