A two-point model connecting plasma parameters at the divertor target and upstream is considered which is exact in the framework of the equations solved by the 2D multi-species plasma fluid code B2. The two-point formulae allow verification and quantitative analysis of the results of numerical modelling. The definition of the loss factors proposed here allows one to relate directly the free parameters of conventional two-point models with the simulation results. An example for the B2-EIRENE modelling of an ASDEX-Upgrade plasma with detached divertor is discussed. The new code analysis tool is applied to analyse the phenomenon of roll-over of the target incident particle flux as it appears in the simulations.
Bayesian inference of particle source and sink in a closed-divertor using Balmer line spectroscopy