Optimizing error field correction while minimizing peak heat fluxes in SPARC

While correcting error fields with a single array of 3D coils has been shown to potentially increase local heat fluxes, this work demonstrates that by utilizing multiple toroidal coil arrays in SPARC, error fields can be corrected while maintaining comparable or even lower local divertor heat fluxes compared to the uncorrected scenario. Due to the high magnetic field, high power, and compact size of SPARC, high parallel heat fluxes are expected. While they will need to be exhausted mainly by radiation, the presence of non-axisymmetric magnetic field perturbations generates intricate 3D edge magnetic topologies that alter the heat flux distributions, and therefore modify the amount of radiative exhaust needed to protect the plasma facing components. In this work, the MHD code M3DC1 is used to simulate the 3D magnetic perturbations and a 3D heat flux layer model is used to compute the heat flux distributions derived from magnetic footprints calculated with the MAFOT code. Our findings highlight that it is possible to optimize the 3D coil configuration to both minimize the error field and limit the local attached and unmitigated heat fluxes simultaneously when two rows of coils are employed. The impact on the 3D geometry of the divertor region is also explored using the HEAT code.