The Ratio of D-T to D-D Reactions as a Measure of the Fuel Density-Radius Product in Initially Tritium-Free Inertial Confinement Fusion Targets

It is proposed that the ratio of deuterium-tritium (D-T) to neutron producing deuterium-deuterium (D-D) reactions (R_DT/R_DD) be used as a diagnostic of the fuel density-radius product (⟨ρR⟩) for initially tritium-free advanced fuel inertial confinement fusion targets, For deuterium targets, R_DT/R_DD ≈ 0,08 ⟨ρR⟩ for fuel ⟨ρR⟩ 0.1 g/cm². For fuel of larger values of ⟨ρR⟩, thermalization of fusion product tritons in the fuel greatly alters the dependence of R_DT/R_DD on target characteristics.