Hydrogen inventory simulations for PFCs (HISP)

Hydrogen Inventory Simulations for Plasma facing components (HISP) is an open-source simulation tool to model the evolution of hydrogen (H) isotopes inventory in plasma-facing-components (PFCs) of magnetic confinement fusion devices. The objective was to produce a demonstrative study describing the efficiency of tritium (T) removal strategies in ITER. HISP transforms plasma code outputs to spatial-averaged inputs along ITER’s first wall (FW) and divertor for 1D H transport models using FESTIM. Exposure conditions were tested in three scenarios that included DT operation and varied T removal methods. Generally, DT operation resulted in ≈ 35 g of T in FW and divertor components after 10 days of DT pulses. Almost 80 % of the total T inventory resided in co-deposited boron layers in the divertor. Baking proved to be the most effective T removal method in the divertor, decreasing T inventory by almost 88 % for tungsten and almost 30 % for boron. T removal was also evaluated from Glow Discharge Conditioning (GDC) - with a peak efficiency of 23 % in the tungsten FW - and low power deuterium (DD) pulses - with a peak efficiency of 13 % in the entire divertor. Due to the high removal efficiency of baking, inclusion of GDC and DD pulses in the tested scenarios did not meaningfully change final T inventory values, which varied by less than 2 % in the FW and 10 % in the divertor between scenarios.