title: National Ignition Facility laser performance status.
abstract: The National Ignition Facility (NIF) is the world's largest laser system. It contains a 192 beam neodymium glass laser that is designed to deliver 1.8 MJ at 500 TW at 351 nm in order to achieve energy gain (ignition) in a deuterium-tritium nuclear fusion target. To meet this goal, laser design criteria include the ability to generate pulses of up to 1.8 MJ total energy, with peak power of 500 TW and temporal pulse shapes spanning 2 orders of magnitude at the third harmonic (351 nm or 3omega) of the laser wavelength. The focal-spot fluence distribution of these pulses is carefully controlled, through a combination of special optics in the 1omega (1053 nm) portion of the laser (continuous phase plates), smoothing by spectral dispersion, and the overlapping of multiple beams with orthogonal polarization (polarization smoothing). We report performance qualification tests of the first eight beams of the NIF laser. Measurements are reported at both 1omega and 3omega, both with and without focal-spot conditioning. When scaled to full 192 beam operation, these results demonstrate, to the best of our knowledge for the first time, that the NIF will meet its laser performance design criteria, and that the NIF can simultaneously meet the temporal pulse shaping, focal-spot conditioning, and peak power requirements for two candidate indirect drive ignition designs.
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, CA 94551, USA. haynam1@llnl.gov
authors.forename: C A
authors.initials: CA
authors.lastname: Haynam
authors.forename: P J
authors.initials: PJ
authors.lastname: Wegner
authors.forename: J M
authors.initials: JM
authors.lastname: Auerbach
authors.forename: M W
authors.initials: MW
authors.lastname: Bowers
authors.forename: S N
authors.initials: SN
authors.lastname: Dixit
authors.forename: G V
authors.initials: GV
authors.lastname: Erbert
authors.forename: G M
authors.initials: GM
authors.lastname: Heestand
authors.forename: M A
authors.initials: MA
authors.lastname: Henesian
authors.forename: M R
authors.initials: MR
authors.lastname: Hermann
authors.forename: K S
authors.initials: KS
authors.lastname: Jancaitis
authors.forename: K R
authors.initials: KR
authors.lastname: Manes
authors.forename: C D
authors.initials: CD
authors.lastname: Marshall
authors.forename: N C
authors.initials: NC
authors.lastname: Mehta
authors.forename: J
authors.initials: J
authors.lastname: Menapace
authors.forename: E
authors.initials: E
authors.lastname: Moses
authors.forename: J R
authors.initials: JR
authors.lastname: Murray
authors.forename: M C
authors.initials: MC
authors.lastname: Nostrand
authors.forename: C D
authors.initials: CD
authors.lastname: Orth
authors.forename: R
authors.initials: R
authors.lastname: Patterson
authors.forename: R A
authors.initials: RA
authors.lastname: Sacks
authors.forename: M J
authors.initials: MJ
authors.lastname: Shaw
authors.forename: M
authors.initials: M
authors.lastname: Spaeth
authors.forename: S B
authors.initials: SB
authors.lastname: Sutton
authors.forename: W H
authors.initials: WH
authors.lastname: Williams
authors.forename: C C
authors.initials: CC
authors.lastname: Widmayer
authors.forename: R K
authors.initials: RK
authors.lastname: White
authors.forename: S T
authors.initials: ST
authors.lastname: Yang
authors.forename: B M
authors.initials: BM
authors.lastname: Van Wonterghem