A view on wave excitation by W dust influx in tokamak SOL

Abstract

The contamination by W impurity originating from dust released from Plasma Facing Components (PFCs) is a crucial issue of ITER and future reactors, expected to be fitted with an all-W first wall. In all existing experiments, information on dust pollution is obtained from post-mortem analysis and the data provided are accumulated over many discharges, and generally no shot-by-shot analysis is available. Real-time detection of W dust ‘footprints’ in the form of electrostatic waves can be useful to monitor edge T e and n e pedestal evolution in high performance tokamaks.