Numerical modelling for divertor design of the WEST device with a focus on plasma–wall interactions

Abstract

In the perspective of operating tungsten monoblocks in WEST, the ongoing major upgrade of the Tore Supra tokamak, a dedicated modelling effort has been carried out to simulate the interaction between the edge plasma and the tungsten wall. A new transport code, SolEdge2D-EIRENE, has been developed with the ability to simulate the plasma up to the first wall. This is especially important for steady state operation, where thermal loads on all the plasma facing components, even remote from the plasma, are of interest. Moreover, main chamber tungsten sources are thought to dominate the contamination of the plasma core. We present here in particular new developments aimed at improving the description of the interface between the plasma and the wall, namely a way to treat sheath physics in a more faithful way using the output of 1D particle in cell simulations. Moreover, different models for prompt redeposition have been implemented and are compared. The latter is shown to play an important role in the balance between divertor and main chamber sources.

Interchange Turbulence Model for the Edge Plasma in SOLEDGE2D‐EIRENE

“…The design of ITER plasma facing component relies strongly on transport codes predictions [1][2][3] in term of heat deposition. These transport codes use simplified models to describe the turbulent transport, a first principle direct numerical simulation of turbulent structures [4,5] being prohibitive in term of computational time.…”

Optimization of turbulence reduced model free parameters based on L‐mode experiments and 2D transport simulations

“…In order to estimate the intensity of the turbulent transport in the TCV shot described above, we analyse the experimental data with the transport code SolEdge2D‐Eirene . As any transport code, SolEdge2D requires providing effective cross‐field diffusivities to properly account for the turbulent transport.…”

A table of Balmer γ line shapes for the diagnostic of magnetic fusion plasmas

“…Our database for Dγ (or any database obtained from the ab initio method discussed above) would provide an interesting approach because it involves no restrictive physical approximation on the atomic physics (namely the time-dependent Schrödinger equation is solved) and it allows for a systematic evaluation of the emission spectra along the line-of-sight. As an illustration we show here an example of application to a virtual plasma background calculated from the SolEdge2D-EIRENE code [28] (see Fig. 7).…”