The first-wall components of the next-generation machines will have to
support very high thermal loads. Different solutions have been propos
ed to handle the energy flux in the scrape-off layer and to prevent th
e tiles from overheating. The necessity to monitor the tile surface te
mperature to prevent their damage has stimulated the development of re
liable optical diagnostics, in spite of the severe constraints imposed
by the hostile reactor environment. We have implemented a new infrare
d thermal imaging system on the Frascati Tokamak Upgrade machine. It h
as: (I) high dynamics to allow measurements in the whole temperature r
ange covered during plasma operation; (2) high temporal resolution (<1
ms) for measurements during fast events as well as edge localized mod
es (ELMs) and disruptions; (3) high spatial resolution to discover hot
spots, which can seriously affect plasma operations. (C) 1997 America
n Institute of Physics.