Note: Radiochemical measurement of fuel and ablator areal densities in cryogenic implosions at the National Ignition Facility

A new radiochemical method for determining deuterium-tritium (DT) fuel and plastic ablator (CH) areal densities (ρR) in high-convergence, cryogenic inertial confinement fusion implosions at the National Ignition Facility is described. It is based on measuring the (198)Au/(196)Au activation ratio usi...

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Bibliographic Details
Published in:Review of scientific instruments 2015-07, Vol.86 (7), p.076105-076105
Main Authors: Hagmann, C, Shaughnessy, D A, Moody, K J, Grant, P M, Gharibyan, N, Gostic, J M, Wooddy, P T, Torretto, P C, Bandong, B B, Bionta, R, Cerjan, C J, Bernstein, L A, Caggiano, J A, Herrmann, H W, Knauer, J P, Sayre, D B, Schneider, D H, Henry, E A, Fortner, R J
Format: Article
Language:English
Subjects:
Ablation
Burn-in
Deuterium
Fuels
Ignition
Implosions
Inertial confinement fusion
Magnetic tape
Radiochemistry
Scientific apparatus & instruments
Tritium
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Summary:A new radiochemical method for determining deuterium-tritium (DT) fuel and plastic ablator (CH) areal densities (ρR) in high-convergence, cryogenic inertial confinement fusion implosions at the National Ignition Facility is described. It is based on measuring the (198)Au/(196)Au activation ratio using the collected post-shot debris of the Au hohlraum. The Au ratio combined with the independently measured neutron down scatter ratio uniquely determines the areal densities ρR(DT) and ρR(CH) during burn in the context of a simple 1-dimensional capsule model. The results show larger than expected ρR(CH) values, hinting at the presence of cold fuel-ablator mix.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4926743