title: Hard x-ray (>100 keV) imager to measure hot electron preheat for indirectly driven capsule implosions on the NIF.
abstract: We have fielded a hard x-ray (>100 keV) imager with high aspect ratio pinholes to measure the spatially resolved bremsstrahlung emission from energetic electrons slowing in a plastic ablator shell during indirectly driven implosions at the National Ignition Facility. These electrons are generated in laser plasma interactions and are a source of preheat to the deuterium-tritium fuel. First measurements show that hot electron preheat does not limit obtaining the fuel areal densities required for ignition and burn.
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA. doeppner1@llnl.gov
authors.forename: T
authors.initials: T
authors.lastname: Döppner
authors.forename: E L
authors.initials: EL
authors.lastname: Dewald
authors.forename: L
authors.initials: L
authors.lastname: Divol
authors.forename: C A
authors.initials: CA
authors.lastname: Thomas
authors.forename: S
authors.initials: S
authors.lastname: Burns
authors.forename: P M
authors.initials: PM
authors.lastname: Celliers
authors.forename: N
authors.initials: N
authors.lastname: Izumi
authors.forename: J L
authors.initials: JL
authors.lastname: Kline
authors.forename: G
authors.initials: G
authors.lastname: LaCaille
authors.forename: J M
authors.initials: JM
authors.lastname: McNaney
authors.forename: R R
authors.initials: RR
authors.lastname: Prasad
authors.forename: H F
authors.initials: HF
authors.lastname: Robey
authors.forename: S H
authors.initials: SH
authors.lastname: Glenzer
authors.forename: O L
authors.initials: OL
authors.lastname: Landen