Operating a tungsten-wall tokamak: the key role of Soft X-Ray measurements

by Didier Mazon (CEA IRFM)

Thursday 28 Mar 2024, 11:00 → 13:00 Europe/Warsaw

Since the advent of tungsten walls in ITER, the problem of precisely reconstructing the distribution of tungsten (W) concentration in the plasma has become all the more relevant. Among the different possible approaches, those using Soft X-ray (SXR) measurements seem particularly promising. Indeed, essential plasma parameters can be inferred from X-ray spectrum measurements like magnetic axis, electron temperature, impurity concentration and its spatial distribution after tomographic inversion. Despite being extremely rich in information, the access to continuous spectral measurements is nevertheless a technical challenge rarely implemented in actual tokamaks. 
This talk reports on X-ray spectrum measurements with different detectors for the WEST tokamak.