Predicted Performance of a Tangential Viewing Hard X-Ray Camera for the DIII-D High Field Side Lower Hybrid Current Drive Experiment

High field side (HFS) launch of lower hybrid current drive (LHCD) has improved accessibility and penetration over low field side launch on DIII-D. Simulations predict single pass absorption under a wide range of plasma conditions. Hard x-ray (HXR) measurement of LHCD generated fast electron bremsstrahlung (50-250 keV) will validate wave propagation and absorption. Emissivity profiles are recovered from 1D inversion of HXR brightness to determine LH damping location and fast electron energy and slowing down time. The camera will be implemented by populating 32 tangential sightlines of the existing Gamma Ray Imager with Kromek SPEAR™ CZT detectors sensitive to 30-250 keV photons. 10 keV energy and <0.5 ms time resolution are expected. Pulses are processed using 250 ns shaping time Cremat CR-200 gaussian shaping modules and digitized by 25 MHz D-TACQ ACQ216 digitizers. Performance of the HXR camera is evaluated by comparing predicted fast electron density profiles and inverted synthetic brightnesses obtained from GENRAY/CQL3D. Inversions closely matched predicted fast electron profiles for a range of experimental parameters. The latest simulations, designs, and results will be presented.