Journal
PHYSICS OF PLASMAS
Volume 8, Issue 5, Pages 2245-2250Publisher
AIP Publishing
DOI: 10.1063/1.1347037
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Among the final shots at the Nova laser [Campbell , Rev. Sci. Instrum. 57, 2101 (1986)] was a series testing the VISAR (velocity interferometry system for any reflector) technique that will be the primary diagnostic for timing the shocks in a NIF (National Ignition Facility) ignition capsule. At Nova, the VISAR technique worked over the range of shock strengths and with the precision required for the NIF shock timing job-shock velocities in liquid D-2 from 12 to 65 mum/ns with better than 2% accuracy. VISAR images showed stronger shocks overtaking weaker ones, which is the basis of the plan for setting the pulse shape for the NIF ignition campaign. The technique is so precise that VISAR measurements may also play a role in certifying beam-to-beam and shot-to-shot repeatability of NIF laser pulses. (C) 2001 American Institute of Physics.
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