title: Shell trajectory measurements from direct-drive implosion experiments.
abstract: A technique to measure the shell trajectory in direct-drive inertial confinement fusion implosions is presented. The x-ray self emission of the target is measured with an x-ray framing camera. Optimized filtering limits the x-ray emission from the corona plasma, isolating a sharp intensity gradient very near the ablation surface. This enables one to measure the radius of the imploding shell with an accuracy better than 1 μm and to determine a 200-ps average velocity to better than 2%.
authors.affiliation: Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14636, USA. tmic@lle.rochester.edu
authors.forename: D T
authors.initials: DT
authors.lastname: Michel
authors.forename: C
authors.initials: C
authors.lastname: Sorce
authors.forename: R
authors.initials: R
authors.lastname: Epstein
authors.forename: N
authors.initials: N
authors.lastname: Whiting
authors.forename: I V
authors.initials: IV
authors.lastname: Igumenshchev
authors.forename: R
authors.initials: R
authors.lastname: Jungquist
authors.forename: D H
authors.initials: DH
authors.lastname: Froula