Progress on the design and prototyping of SPARC diagnostics

The SPARC diagnostic system is comprised of approximately forty subsystems that will enable the demonstration of Q > 1 in the first SPARC campaign and support the de-risking of the ARC fusion pilot plant in subsequent campaigns. A high-level diagnostic design update will be presented with all subsystems having completed their preliminary designs. Prototyping and environmental testing efforts are underway to increase the likelihood that each measurement will function in the challenging thermal, structural, electromagnetic, and radiation environment presented by SPARC. One key prototyping effort that will be highlighted is a full-scale 60° mockup of the SPARC vacuum vessel (VV) where the integrated assembly of in-vessel diagnostics and plasma-facing components (PFCs) is being tested. This mockup not only ensures that diagnostics and PFCs will fit together but also that they can be assembled efficiently given the aggressive SPARC schedule. Additional environmental testing efforts include mechanical shock/vibration testing of electrical feedthroughs, magnetic field and neutron exposure of electronics, and thermal and vacuum testing of components mounted on the VV and in port plugs.