10-ps X-Ray Imaging of Cone-Shell Target Implosion at OMEGA Laser

摘要

A shell target with a cone inserted has been proposed for Fast Ignition (FI) . Short-pulse heating laser is expected to be injected through interior of the cone to the imploded core plasma created near the tip. We have studied the implosion dynamics of cone-shell targets at University of Rochester Laboratory for Laser Energetics OMEGA laser. Using the MIXS (multi-imaging x-ray streak camera) technique, a series of two-dimensional x-ray images were recorded of the imploded core and the cone tip with temporal and spatial resolutions of 13 ps and 10-20 μm, respectively. Nearly 100 sequential frames with 10-ps intervals ware recorded. Dynamic behavior of the core formation and the cone tip heating were observed. The imploded core plasma was found to have strongly nonuniform structure due to the presence of the cone, and to be interacting with the tip of the cone. Results will be compared with hydrodynamic simulations.