title: Ion thermal decoupling and species separation in shock-driven implosions.
abstract: Anomalous reduction of the fusion yields by 50% and anomalous scaling of the burn-averaged ion temperatures with the ion-species fraction has been observed for the first time in D^{3}He-filled shock-driven inertial confinement fusion implosions. Two ion kinetic mechanisms are used to explain the anomalous observations: thermal decoupling of the D and ^{3}He populations and diffusive species separation. The observed insensitivity of ion temperature to a varying deuterium fraction is shown to be a signature of ion thermal decoupling in shock-heated plasmas. The burn-averaged deuterium fraction calculated from the experimental data demonstrates a reduction in the average core deuterium density, as predicted by simulations that use a diffusion model. Accounting for each of these effects in simulations reproduces the observed yield trends.
authors: Plasma Science and Fusion Center Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors: Hans G
authors: HG
authors: Rinderknecht
authors: Plasma Science and Fusion Center Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors: M J
authors: MJ
authors: Rosenberg
authors: Plasma Science and Fusion Center Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors: C K
authors: CK
authors: Li
authors: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors: N M
authors: NM
authors: Hoffman
authors: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors: G
authors: G
authors: Kagan
authors: Plasma Science and Fusion Center Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors: A B
authors: AB
authors: Zylstra
authors: Plasma Science and Fusion Center Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors: H
authors: H
authors: Sio
authors: Plasma Science and Fusion Center Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors: J A
authors: JA
authors: Frenje
authors: Plasma Science and Fusion Center Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors: M
authors: M
authors: Gatu Johnson
authors: Plasma Science and Fusion Center Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors: F H
authors: FH
authors: Séguin
authors: Plasma Science and Fusion Center Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors: R D
authors: RD
authors: Petrasso
authors: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors: P
authors: P
authors: Amendt
authors: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors: C
authors: C
authors: Bellei
authors: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors: S
authors: S
authors: Wilks
authors: Laboratory for Laser Energetics, Rochester, New York 14623, USA.
authors: J
authors: J
authors: Delettrez
authors: Laboratory for Laser Energetics, Rochester, New York 14623, USA.
authors: V Yu
authors: VY
authors: Glebov
authors: Laboratory for Laser Energetics, Rochester, New York 14623, USA.
authors: C
authors: C
authors: Stoeckl
authors: Laboratory for Laser Energetics, Rochester, New York 14623, USA.
authors: T C
authors: TC
authors: Sangster
authors: Laboratory for Laser Energetics, Rochester, New York 14623, USA.
authors: D D
authors: DD
authors: Meyerhofer
authors: General Atomics, San Diego, California 92121, USA.
authors: A
authors: A
authors: Nikroo