Developments in SPARC disruption radiation modeling with Emis3D

SPARC will operate with high stored thermal energy densities of over 1 MJ/m³. Thermal energy is released in plasma disruptions in fast, sub-millisecond thermal quenches (TQs), which could risk melting key components such as the divertor. SPARC disruptions will be mitigated with Massive Gas Injection (MGI). Mitigation efficacy will be evaluated using a dedicated set of bolometers. The disruption bolometer layout is tested on simulated disruption radiation from M3D-C1 and NIMROD 3D MHD simulators using the synthetic diagnostic framework Cherab and the radiation modeling code Emis3D (B. Stein-Lubrano et al 2024 Nucl. Fusion). The planned bolometer layout is found to be capable of measuring radiated power Prad to 90% accuracy (<10% error) during key disruption stages including the thermal and current quenches using unrefined radiation structure models. Accuracy in the pre-TQ is limited by the complexity of radiation structures, but improves with more refined models.