title: Note: Radiochemical measurement of fuel and ablator areal densities in cryogenic implosions at the National Ignition Facility.
abstract: 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.
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: C
authors.initials: C
authors.lastname: Hagmann
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: D A
authors.initials: DA
authors.lastname: Shaughnessy
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: K J
authors.initials: KJ
authors.lastname: Moody
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: P M
authors.initials: PM
authors.lastname: Grant
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: N
authors.initials: N
authors.lastname: Gharibyan
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Gostic
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: P T
authors.initials: PT
authors.lastname: Wooddy
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: P C
authors.initials: PC
authors.lastname: Torretto
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: B B
authors.initials: BB
authors.lastname: Bandong
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: R
authors.initials: R
authors.lastname: Bionta
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Cerjan
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: L A
authors.initials: LA
authors.lastname: Bernstein
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Caggiano
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: H W
authors.initials: HW
authors.lastname: Herrmann
authors.affiliation: Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.
authors.forename: J P
authors.initials: JP
authors.lastname: Knauer
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: D B
authors.initials: DB
authors.lastname: Sayre
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: D H
authors.initials: DH
authors.lastname: Schneider
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: E A
authors.initials: EA
authors.lastname: Henry
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: Fortner