Fast Pb-glass neutron-to-light converter for ICF (Inertial Confinement Fusion) target burn history measurements

Details Fast Pb-glass neutron-to-light converter for ICF (Inertial Confinement Fusion) target burn history measurements Fast Pb-glass neutron-to-light converter for ICF (Inertial Confinement Fusion) target burn history measurements

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990hite.conf.....l&link_type=abstract

Presented at the 8th Topical Conference on High-Te

Physics

Optics

Burning Time, Deuterium, Gamma Rays, Helium Isotopes, Inertial Confinement Fusion, Laser Targets, Nova Laser System, Streak Cameras, Tritium, Cassegrain Optics, Cerenkov Radiation, Electron-Positron Pairs, Glass, Lead Oxides, Neutrons, Pair Production, Telescopes

Scientific paper

We are developing a streak camera based instrument to diagnose the fusion reaction rate (burn history) within laser-driven ICF targets filled with D-T fuel. Recently, we attempted measurements using the 16.7 MeV gamma ray emitted in the T(d,gamma)He(5) fusion reaction. Pb glass which has a large cross section for pair production acts as a gamma-ray-to-light converter. Gamma rays interact within the glass to form electron-positron pairs that produce large amounts (1000 photons/gamma ray) of prompt (less than 10 ps) Cerenkov light as they slow down. In our experimental instrument, an f/10 Cassegrain telescope optically couples light produced within the converter to a streak camera having 20-ps resolution. Experiments using high-yield (10(exp 13) D-T neutrons), direct-drive targets at Nova produced good signals with widths of 200 ps. Time-of-flight measurements show the signals to be induced by neutrons rather than gamma rays. The Pb glass appears to act as a fast neutron-to-light converter. We continue to study the interactions process and the possibility of using the 16.7 MeV gamma rays for burn time measurements.

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