title: Effects of fuel-shell mix upon direct-drive, spherical implosions on OMEGA.
abstract: Fuel-shell mix and implosion performance are studied for many capsule types in direct-drive experiments at OMEGA. The amount of mixing and the size of the mix region are inferred from charged-particle spectrometry data and confirmed with an experimentally constrained model. Measured yields and convergence ratios CR fall short of one-dimensional predictions, especially for low capsule fill pressures. CR is approximately 11 for pressures from 3 to 15 atm, in contrast to predictions of approximately 25 for 3 atm and approximately 12 for 15 atm. The performance shortfalls are likely to be caused by fuel-shell mix.
authors.affiliation: Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge 02139, USA.
authors.forename: C K
authors.initials: CK
authors.lastname: Li
authors.forename: F H
authors.initials: FH
authors.lastname: Séguin
authors.forename: J A
authors.initials: JA
authors.lastname: Frenje
authors.forename: S
authors.initials: S
authors.lastname: Kurebayashi
authors.forename: R D
authors.initials: RD
authors.lastname: Petrasso
authors.forename: D D
authors.initials: DD
authors.lastname: Meyerhofer
authors.forename: J M
authors.initials: JM
authors.lastname: Soures
authors.forename: J A
authors.initials: JA
authors.lastname: Delettrez
authors.forename: V Yu
authors.initials: VY
authors.lastname: Glebov
authors.forename: P B
authors.initials: PB
authors.lastname: Radha
authors.forename: S P
authors.initials: SP
authors.lastname: Regan
authors.forename: S
authors.initials: S
authors.lastname: Roberts
authors.forename: T C
authors.initials: TC
authors.lastname: Sangster
authors.forename: C
authors.initials: C
authors.lastname: Stoeckl