REVIEW OF SECONDARY AND TERTIARY REACTIONS, AND NEUTRON-SCATTERING AS DIAGNOSTIC-TECHNIQUES FOR INERTIAL CONFINEMENT FUSION-TARGETS

Fuel areal density, [rho-R], is a fundamental quantity for ICF implosions. For current and future targets, areal densities are large enough that a variety of neutron based diagnostic techniques can be used to determine fuel [rho-R]. These include measurements based on the secondary production of DT neutrons from initially pure deuterium fuel and, for higher [rho-R] values, techniques utilizing high energy tertiary neutrons or lower energy scattered neutrons. This paper describes these techniques and gives an overview of the current experimental status.