An infrared imaging system has been installed on the National Spherical Torus Experiment at Princeton Plasma Physics Laboratory to measure the surface temperatures on the lower divertor and center stack. The imaging system is based on an Indigo Alpha 160×128 microbolometer camera with 12 bits/pixel operating in the 7–13 μm range with a 30 Hz frame rate and a dynamic temperature range of 0–700 °C. From these data and knowledge of graphite thermal properties, the heat flux is derived with a classic one-dimensional conduction model. Preliminary results of heat flux scaling are reported.
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Mastrovito et al. (2003) studied this question.
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