Radiochemical determination of Inertial Confinement Fusion capsule compression at the National Ignition Facility

D A Shaughnessy; K J Moody; N Gharibyan; P M Grant; J M Gostic; P C Torretto; P T Wooddy; B B Bandong; J D Despotopulos; C J Cerjan; C A Hagmann; J A Caggiano; C B Yeamans; L A Bernstein; D H G Schneider; E A Henry; R J Fortner

doi:10.1063/1.4883186

Radiochemical determination of Inertial Confinement Fusion capsule compression at the National Ignition Facility

Rev Sci Instrum. 2014 Jun;85(6):063508. doi: 10.1063/1.4883186.

Authors

D A Shaughnessy¹, K J Moody¹, N Gharibyan¹, P M Grant¹, J M Gostic¹, P C Torretto¹, P T Wooddy¹, B B Bandong¹, J D Despotopulos¹, C J Cerjan¹, C A Hagmann¹, J A Caggiano¹, C B Yeamans¹, L A Bernstein¹, D H G Schneider¹, E A Henry¹, R J Fortner¹

Affiliation

¹ Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.

PMID: 24985820
DOI: 10.1063/1.4883186

Abstract

We describe a radiochemical measurement of the ratio of isotope concentrations produced in a gold hohlraum surrounding an Inertial Confinement Fusion capsule at the National Ignition Facility (NIF). We relate the ratio of the concentrations of (n,γ) and (n,2n) products in the gold hohlraum matrix to the down-scatter of neutrons in the compressed fuel and, consequently, to the fuel's areal density. The observed ratio of the concentrations of (198m+g)Au and (196g)Au is a performance signature of ablator areal density and the fuel assembly confinement time. We identify the measurement of nuclear cross sections of astrophysical importance as a potential application of the neutrons generated at the NIF.