Extending the use of RTNADs capabilities at the NIF

The real-time neutron activation detector (RTNAD) array, with 48 elements, measures the un-scattered primary DT-neutron-yield isotropy for inertial confinement implosions at the NIF. The array also characterizes fuel and ablator areal density distributions for DT experiments. We are investigating the ability to use present or modified versions of the RTNADs to measure additional physics parameters including the DD-neutron isotropy for DD-fuel experiments, hot-spot motion for both DT- and DD-fuel experiments, and high-energy photon yield and energy distributions for the Advanced Radiography Campaign. We also consider extending the RTNAD capability to assess DT-neutron isotropies at much higher yields (i.e., > 1e17) than presently achieved.