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Title: Measuring preheat in laser-drive aluminum using velocity interferometer system for any reflector: Experiment

In this paper, we systematically study preheating in laser-direct-drive shocks by using a velocity interferometer system for any reflector (VISAR). Using the VISAR, we measured free surface velocity histories of Al samples over time, 10–70 μm thick, driven directly by a laser at different frequencies (2ω, 3ω). Analyzing our experimental results, we concluded that the dominant preheating source was X-ray radiation. We also discussed how preheating affected the material initial density and the measurement of Hugoniot data for high-Z materials (such as Au) using impedance matching. To reduce preheating, we proposed and tested three kinds of targets.
Authors:
; ; ; ; ; ; ; ;  [1]
  1. Shanghai Institute of Laser Plasma, P.O. BOX 800-229, Shanghai 201800 (China)
Publication Date:
OSTI Identifier:
22303783
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALUMINIUM; HEAT TREATMENTS; IMPEDANCE; INTERFEROMETERS; LASERS; MATERIALS; SURFACES; VELOCITY; X RADIATION