First wall fluxes modelling with 3D PFCs coupled to 3D plasmas in the HEAT toolkit

Leveraging on the Heat flux Engineering Analysis Toolkit (HEAT) [1], re-

cently developed to generate time varying optical heat loads applied to real

engineering computer aided design (CAD), in the present work we address the

new workflow to integrate 3D MHD magnetic equilibria from M3D-C1 [2], that

break the symmetry of the the tokamak equilibrium, with the MAFOT [3] mag-

netic field line tracing code. Assessing whether or not a variety of desirable

magnetic equilibria is sustainable with respect to the plasma facing component

(PFC) engineering limits, is particularly important in order to guarantee opti-

mal operation and the safety of the reactor. The heat loads striking the wall are

not toroidally symmetric, as the PFCs are inherently 3D objects conditioned by

3D plasmas. Therefore the ability to predict 3D heat loads resulting from mag-

netic coil error fields, toroidal field ripple, and resonant magnetic perturbation

structures upon 3D PFC geometry, is desired for high-precision 3D predictions.

A preliminary analysis of the effects of resonant magnetic perturbations to 3D

heat loads in DIII-D is presented for diverted discharges.

This work is supported by US DoE under DE-AC02-09CH11466, DE-AC05-

00OR22725 and DE-FC02-04ER54698.