Neutron spectroscopy with a large neutron time‐of‐flight detector array (LaNSA) (invited)

The recent completion of the Large Neutron Scintillator Array (LaNSA) at the Nova Laser Fusion Facility has allowed low yield neutron energy spectra to be measured for ICF implosions. These spectra can be used to determine some fundamental implosion characteristics such as fuel areal density and ion temperature. Details of how neutron energy spectra are measured with an array of single particle detectors will be presented, as well as experimental data showing the application of these spectra to the determination of implosion parameters. Particular emphasis will be placed on measurements of secondary DT neutrons produced from initially pure deuterium fuel. Determination of the interacting triton energy spectrum from secondary neutron energy spectroscopy and its application to studies of fuel‐pusher mixing will also be discussed.