Measurement and analysis of radiated power components in the JET MkI divertor using VUV spectroscopy

This paper presents a spectroscopic study of deuterium and impurity radiation in the MkI divertor of JET in different experimental regimes. Radiated power measurements using absolutely calibrated VUV spectroscopy are consistent with bolometer measurements in a variety of impurity scenarios. These observations, combined with measurements of visible emission, are compared with code predictions of divertor radiation distributions, highlighting uncertainties in the description of the background plasma and of the carbon source, which affect detailed modelling of divertor impurity transport.