title: Soft x-ray backlighting of direct-drive implosions using a spherical crystal imager on OMEGA.
abstract: Using a spherically bent quartz crystal for the Si He(α) line at ~1.865 keV, a narrowband x-ray imager has been deployed at the Omega Laser Facility to record backlit images of direct-drive laser implosions. The crystal was cut along the 1011 planes for a 2d spacing of 0.687 nm, resulting in a Bragg angle of 83.9°. Apertures in front of the crystal were used to control the astigmatism of the imaging system. The backlit images show a high signal-to-background ratio of >10:1 with backlighter laser energies ≥1.5 kJ at a 10-ps pulse duration and a spatial resolution of better than 20 μm.
authors.affiliation: Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA. csto@lle.rochester.edu
authors.forename: C
authors.initials: C
authors.lastname: Stoeckl
authors.forename: J A
authors.initials: JA
authors.lastname: Delettrez
authors.forename: R
authors.initials: R
authors.lastname: Epstein
authors.forename: G
authors.initials: G
authors.lastname: Fiksel
authors.forename: D
authors.initials: D
authors.lastname: Guy
authors.forename: M
authors.initials: M
authors.lastname: Hohenberger
authors.forename: R K
authors.initials: RK
authors.lastname: Jungquist
authors.forename: C
authors.initials: C
authors.lastname: Mileham
authors.forename: P M
authors.initials: PM
authors.lastname: Nilson
authors.forename: T C
authors.initials: TC
authors.lastname: Sangster
authors.forename: M J
authors.initials: MJ
authors.lastname: Shoup
authors.forename: W
authors.initials: W
authors.lastname: Theobald