Infrared Thermographic Imaging of Norman C-2W Components

Monitoring heat deposition on plasma-facing components is necessary for machine protection and to develop physics models of plasma losses. High-speed infrared (IR) thermographic imaging provides broad spatial coverage and resolution along with sufficient time resolution to observe transient phenomena making it a particularly powerful tool. Though the heat deposited to vessel structures on C-2W[1] is modest (approximately 110 kJ), due to the 40 ms plasma duration, a Telops medium-wave IR camera with 640 x 512 resolution and 358 Hz frame rate has been obtained to gain experience with IR thermography in preparation for future long-pulse devices. The camera was first used to measure the power deposition distribution of a neutral beam onto a dump. Next, it was configured to view the confinement vessel wall to observe heating from classical prompt loss of fast ions injected by neutral beams. Imaging of plasma heating of divertor electrodes used for end-biasing is also planned. The diagnostic development, data analysis framework, and challenges arising from variable emissivity and reflections in metallic environments will be presented.