Improved Gamma Reaction History Diagnostic with 10 Pico-Second Resolution for the OMEGA-60 Laser Facility*

Thermonuclear reaction history from an Inertial Confinement Fusion (ICF) implosion can provide insights of the dynamics of the implosion such as alpha particle production rates and ion temperature. The higher order derivatives of the reaction history also enable the ability to differentiate the shock driven yield and compression driven yield, as well as the timing of the onset of alpha self-heating for ignition targets. To make the measurements of the higher order derivatives of the reaction history, diagnostics with temporal resolutions of 10 ps are required. The recent work to bring a Gamma Reaction History diagnostic to the OMEGA-60 laser facility with a fast Pulse-Dilation Photomultiplier Tube (PD-PMT) to provide a 10 ps temporal resolution will be presented. This would enable higher resolution bang-time and burn-width measurements at the facility, and provide enough temporal response required for analyzing the higher-order derivatives of the reaction history curve. By multiplexing the fast GRH diagnostic with the current suite of Gas Cherenkov Detectors at the OMEGA-60 facility, a high dynamic range capability of 4-5 orders of magnitude of yield range can also be achieved.