DT configuration of the TFTR illumination system

A capability for inspection of the hardware inside the Tokamak Fusion Test Reactor (TFTR) vacuum vessel is required for the Deuterium-Tritium (DT) operation phase of the TFTR program. Three remotely controlled illuminators have been installed on the TFTR vacuum vessel to provide the required illumination. The illuminators are controlled from the TFTR control room. Two new thermoelectrically cooled integrating CCD camera systems are installed in the TFTR basement on existing periscopes. Improved performance of the integrating video cameras reduced the number of originally required illuminators from six to three. The two CCD cameras allow integration of video in excess of one minute without CCD dark current becoming significant. These cameras provide a much greater dynamic range than that provided by the standard video cameras which were previously used for inspection.