Shock timing technique for the National Ignition Facility

Details Shock timing technique for the National Ignition Facility Shock timing technique for the National Ignition Facility

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phpl....8.2245m&link_type=abstract

Physics of Plasmas, Volume 8, Issue 5, pp. 2245-2250 (2001).

Physics

25

Shock Waves And Discontinuities, Laser Inertial Confinement, Shock Wave Interactions And Shock Effects, Interferometers

Scientific paper

Among the final shots at the Nova laser [Campbell et al., 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 D2 from 12 to 65 μm/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.

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