PSI Effects on Plasma Burn-through in JET

TL;DR

This paper investigates how plasma surface interactions affect plasma burn-through in JET, comparing carbon and ITER-like walls, and uses simulations to explain the observed differences in radiation behavior.

Contribution

It provides a comparative analysis of PSI effects on plasma burn-through for different wall materials at JET, supported by simulation results.

Findings

Carbon wall radiation dominated by carbon emission

ILW radiation mainly from deuterium, not beryllium

Linear correlation between radiation barrier and C2+ influx in carbon wall

Abstract

Plasma Surface Interaction(PSI) effects on plasma burn-through are compared for the carbon wall and the ITER-Like Wall(ILW) at JET. For the carbon wall, the radiation barrier and C2+ influx have a significant linear correlation whereas the radiation barrier in the ILW does not have such a linear correlation with Be 1+ influx. The JET data are explained by the simulation results of the DYON code. The radiation barrier in the carbon wall JET is dominated by the carbon radiation, but the radiation barrier in the ILW is mainly from the deuterium radiation rather than the beryllium radiation.