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

Journal Article · Wed Jul 15 04:00:00 EDT 2015 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4926743· OSTI ID:22482720

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.; Sayre, D. B.; Schneider, D. H.; Henry, E. A.; Fortner, R. J. ^[1]; Herrmann, H. W. ^[2]; Knauer, J. P. ^[3]

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1. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551 (United States)
2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
3. Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States)

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 {sup 198}Au/{sup 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.

• OSTI ID: 22482720
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 7 Vol. 86; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

07 ISOTOPE AND RADIATION SOURCES
ABLATION
CAPSULES
DENSITY
DEUTERIUM
EVALUATION
GOLD 196
GOLD 198
INERTIAL CONFINEMENT
THERMONUCLEAR FUELS
TRITIUM