title: Improved Performance of High Areal Density Indirect Drive Implosions at the National Ignition Facility using a Four-Shock Adiabat Shaped Drive.
abstract: Hydrodynamic instabilities can cause capsule defects and other perturbations to grow and degrade implosion performance in ignition experiments at the National Ignition Facility (NIF). Here, we show the first experimental demonstration that a strong unsupported first shock in indirect drive implosions at the NIF reduces ablation front instability growth leading to a 3 to 10 times higher yield with fuel ρR>1  g/cm(2). This work shows the importance of ablation front instability growth during the National Ignition Campaign and may provide a path to improved performance at the high compression necessary for ignition.
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: D T
authors.initials: DT
authors.lastname: Casey
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Milovich
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: V A
authors.initials: VA
authors.lastname: Smalyuk
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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authors.initials: DS
authors.lastname: Clark
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: H F
authors.initials: HF
authors.lastname: Robey
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: A
authors.initials: A
authors.lastname: Pak
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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authors.initials: AG
authors.lastname: MacPhee
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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authors.lastname: Baker
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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authors.initials: HS
authors.lastname: Park
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: T
authors.initials: T
authors.lastname: Döppner
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: D A
authors.initials: DA
authors.lastname: Callahan
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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authors.lastname: Haan
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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authors.lastname: Patel
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Peterson
authors.affiliation: General Atomics, San Diego, California 92121, USA.
authors.forename: D
authors.initials: D
authors.lastname: Hoover
authors.affiliation: General Atomics, San Diego, California 92121, USA.
authors.forename: A
authors.initials: A
authors.lastname: Nikroo
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: C B
authors.initials: CB
authors.lastname: Yeamans
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: F E
authors.initials: FE
authors.lastname: Merrill
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
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authors.initials: PL
authors.lastname: Volegov
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
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authors.initials: DN
authors.lastname: Fittinghoff
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: G P
authors.initials: GP
authors.lastname: Grim
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: M J
authors.initials: MJ
authors.lastname: Edwards
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: O L
authors.initials: OL
authors.lastname: Landen
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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authors.initials: KN
authors.lastname: Lafortune
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: B J
authors.initials: BJ
authors.lastname: MacGowan
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: C C
authors.initials: CC
authors.lastname: Widmayer
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: D B
authors.initials: DB
authors.lastname: Sayre
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: R
authors.initials: R
authors.lastname: Hatarik
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: E J
authors.initials: EJ
authors.lastname: Bond
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: S R
authors.initials: SR
authors.lastname: Nagel
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: L R
authors.initials: LR
authors.lastname: Benedetti
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: N
authors.initials: N
authors.lastname: Izumi
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: S
authors.initials: S
authors.lastname: Khan
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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authors.initials: B
authors.lastname: Bachmann
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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authors.initials: BK
authors.lastname: Spears
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Cerjan
authors.affiliation: Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: M
authors.initials: M
authors.lastname: Gatu Johnson
authors.affiliation: Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Frenje