Fig. 2. Main radiation patterns.
The main radiation patterns leading to a radiation collapse of the plasma in JET with a metallic wall, as revealed by the maximum likelihood tomography and visible imaging. a Anomalous high radiation in the core due to accumulation of high Z impurities, mainly W. b Anomalous low field radiation. The crescent shape excessive emission of is typically an effect of heavy impurities in configurations, in which, due to the combination of neoclassical and anomalous transport, they accumulate in the outer equatorial plane. c Radiation instability of the MARFE (Multifaceted Asymmetric Radiation from the Edge) type14,15, typically consequence of impurity seeding or excessive high density in the attempt to reduce the power load on the divertor. d MARFE radiation observed by the visible camera (colour proportional to pixel intensity).