HEAT simulation and IR data comparison for ST40 plasma-facing components

The Heat Flux Engineering Analysis Toolkit (HEAT) (Looby et al., 2022) was used to simulate the heat flux, q t a r g e t , on ST40 molybdenum divertors. Results were compared with experimental infrared (IR) data. Two shots, 11419 and 11376 at time instants 119 ms and 120 ms, with lower-biased disconnected double null geometries, were studied. Single- λ and multi- λ heat flux profiles were used as input in HEAT simulation. The simulated q t a r g e t was used in OpenFOAM to calculate the corresponding temperature, T , on the divertors. Results showed that a good agreement on the simulated q t a r g e t , T and shape of the heat flux on the divertor with the IR data was achieved when a multi- λ heat flux profile was used for 11419, and single- λ heat flux profile for 11376. This indicates that HEAT can be reliable in analyzing and understanding the heat loading of plasma facing components in tokamak devices. • HEAT simulation results were compared with IR data from ST40 divertors. • Single- λ and multi- λ heat flux profiles were used to model the deposited heat flux. • Simulated target heat flux and temperature have a good agreement with the IR data.