Edge code modelling to explore divertor configurations for SPARC's Advanced Divertor Mission*

SPARC is a compact high-field tokamak under construction by Commonwealth Fusion Systems and partners, with a primary mission to achieve Q>1 in magnetic confinement fusion. In addition, SPARC will also serve to test a variety of physics and technology requirements for the follow-on ARC pilot plant. The divertor and vacuum vessel designs for ARC are intended to remain flexible for as long as possible, so that results of advanced divertor experiments can inform their design. To this end, SPARC has a dedicated Advanced Divertor Mission, which focuses on developing an integrated divertor scenario that projects well to long pulse operations in ARC conditions.

Modelling is being employed to characterise operational divertor scenarios in SPARC for this purpose, utilising edge simulation codes such as SOLPS-ITER and SOLEDGE2D. A variety of divertor magnetic topologies will be explored, from a standard divertor, X-divertors, and the X-point target divertor currently conceptualised for ARC. Main ion and impurity radiator gas injection will be varied to access dissipative divertor regimes that project to low target erosion rates, with an aim to better characterise SPARC experiments that could inform the design of an ARC-class divertor. This contribution will present the status of this work.