Thermographic power accounting in MAST

Target heat loads calculated from the infrared camera on MAST are presented. A parameter (a) is used to account for surface effects. In L-Mode discharges, the energy arriving at the targets, as calculated from the camera using a suitable choice of a, is in agreement with that calculated from Langmuir probes and that lost from the core. In H-Mode, energy balance can also be achieved both at the ELM and in inter-ELM periods, although a different value of a is required for different targets and for different power loads. This may be due to increased erosion leading to the production of dust in the plasma sheath. (c) 2004 EURATOM/UKAEA. Published by Elsevier B.V. All rights reserved.