PROTEX: a proton-recoil detector for ICF fusion neutrons

Summary form only given, as follows. Fusion neutron diagnostics are important to inertial confinement fusion (ICF) because they characterize the fusion performance and help to provide the understanding that is needed to develop higher-yield sources. Present yields in excess of 10/sup 13/ (D,T) neutrons can be measured with a proton-recoil detector. This technique, which has not been practical with lower yields, is desirable because it provides prompt, accurate, and unambiguous results. The design that is described in this paper features a compact coaxial cylindrical geometry that optimizes sensitivity and provides in-situ independent recording of background signals. The design also allows for simple adjustments that will make possible consistent measurement of ICF sources as their yields increase to National Ignition Facility levels. At these levels, the proton-recoil technique also will serve as the basis of more detailed studies such as spectral measurements, or perhaps even energy-resolved imaging.