Diagnosing fuel areal-density asymmetries in cryogenic deuterium-tritium implosions at OMEGA using knock-on deuteron spectra

Determining fuel areal-density (ρR) asymmetries is vital to assessing the performance of inertial confinement fusion implosions. The Charged Particle Spectrometers (CPS’s) on OMEGA have been used to infer fuel ρR asymmetries in cryogenic deuterium-tritium implosions by measuring the spectrum of knock-on deuterons emitted in different directions. These knock-on deuterons are produced by elastic scattering between primary DT neutrons and deuterium fuel. The CPS’s, which are located along different lines-of-sight, provide a complimentary measurement to the neutron-based ρR measurements. In this work, we discuss the knock-on deuteron data obtained in the 1-D cryogenic DT Campaign at OMEGA. Preliminary data analysis reveals that measured ρR vary significantly along different measurement lines-of-sight, which may suggest ρR asymmetries and systematic 3-D effects. This work was supported in part by the US DOE, LLE, NSF, and DOE NNSA.