Infrared Thermography Diagnostics Design and Heat Flux Calculations on NSTX-U*

NSTX-U will operate with a plasma current up to 2MA for 5 seconds, and with NBI heating power up to 10MW. The increasing challenge for the safety of the plasma facing components (PFCs) requires a large coverage of IR diagnostics that view the PFCs. High spatial (1 mm) and time (several kHz) resolution IR cameras will be implemented to view the lower and upper divertors PFCs, with an 11° field of view. A wide-angle fast IR camera with a 108° field of view was designed to monitor the central stack, outer chamber, and upper and lower divertors simultaneously. A new 2-D heat flux calculation is being developed that allows temperature dependent PFC material properties, and is being compared with the THEODOR code [A. Herrmann et al., 1995 Plasma Phys. Control. Fusion 37 17]. The IR camera data will inform the new transient heat flux calculation, and in this presentation, we will discuss the effect of mesh size and meshing method on the calculated heat flux.