PROTEX: A proton-recoil detector for inertial confinement fusion neutrons

Abstract

Fusion neutron diagnostics are important to inertial confinement fusion (ICF) because they characterize fusion performance and help to provide the understanding that is needed to develop higher-yield sources. Present yields in excess of 1012 deuterium–tritium (DT) neutrons now 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 PROTEX is a proton-recoil detector which features a compact coaxial cylindrical geometry for maximum sensitivity, in situ simultaneous measurement of background signals, and an ab initio calculated absolute sensitivity. The calculated sensitivity has an estimated absolute accuracy of 6%. With simple adjustments, PROTEX can provide absolute measurement of yield for the National Ignition Facility, the Laser Megajoule Facility, or for any ICF source having a yield greater than 1012 DT neutrons.