Overview of planned SPARC Neutron Spectroscopic Camera

Neutron diagnostics are a critical tool for verifying that SPARC has achieved its fusion goals. Currently planned are a suite of diagnostics consisting of neutron flux monitors, a foil activation system, and a spectroscopic neutron camera (NCAM). The current NCAM design includes 11 lines of sight (LOS) through the midplane diagnostic port. Each LOS will be equipped with a liquid organic scintillator and CVD diamond detectors to measure DD and DT neutron rates, respectively. During the primary reference discharge (Creely JPP 2020), we expect count rates high enough to be able to use the CVD diamonds to extract spectroscopic information as well. In addition, a magnetic proton recoil spectrometer will be installed on the midplane LOS in order to make detailed measurements of neutron spectra in both DD and DT discharges. From neutron rates, the spatial neutron birth profile and fusion rate can be inferred. Spectral information can used to deduce the fuel temperature, fuel ratio, and to understand certain kinetic phenomena (alpha knock-on, RF fast ion tail, impurity effects). The current state of the SPARC NCAM system and supporting calculations and OpenMC simulations will be presented.