title: A recoverable gas-cell diagnostic for the National Ignition Facility.
abstract: The high-fluence neutron spectrum produced by the National Ignition Facility (NIF) provides an opportunity to measure the activation of materials by fast-spectrum neutrons. A new large-volume gas-cell diagnostic has been designed and qualified to measure the activation of gaseous substances at the NIF. This in-chamber diagnostic is recoverable, reusable and has been successfully fielded. Data from the qualification of the diagnostic have been used to benchmark an Monte Carlo N-Particle Transport Code simulation describing the downscattered neutron spectrum seen by the gas cell. We present early results from the use of this diagnostic to measure the activation ofnatXe and discuss future work to study the strength of interactions between plasma and nuclei.
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 95440, USA.
authors.forename: A
authors.initials: A
authors.lastname: Ratkiewicz
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 95440, USA.
authors.forename: L
authors.initials: L
authors.lastname: Berzak Hopkins
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 95440, USA.
authors.forename: D L
authors.initials: DL
authors.lastname: Bleuel
authors.affiliation: University of California, Berkeley, California 94720, USA.
authors.forename: L A
authors.initials: LA
authors.lastname: Bernstein
authors.affiliation: University of California, Berkeley, California 94720, USA.
authors.forename: K
authors.initials: K
authors.lastname: van Bibber
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 95440, USA.
authors.forename: W S
authors.initials: WS
authors.lastname: Cassata
authors.affiliation: University of California, Berkeley, California 94720, USA.
authors.forename: B L
authors.initials: BL
authors.lastname: Goldblum
authors.affiliation: University of Oslo, N-0316 Oslo, Norway.
authors.forename: S
authors.initials: S
authors.lastname: Siem
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 95440, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Velsko
authors.affiliation: iThemba LABS, Somerset West 7129, South Africa.
authors.forename: M
authors.initials: M
authors.lastname: Wiedeking
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 95440, USA.
authors.forename: C B
authors.initials: CB
authors.lastname: Yeamans