2004年9月19日 · The National Ignition Facility (NIF) requires diagnostics to analyze high-energy density physics experiments. A VISAR (Velocity Interferometry System for Any Reflector) diagnostic has been...

One of NIF’s most versatile and frequently used diagnostics, VISAR provides vital information for future experiment design and calibration. Credit: Jason Laurea "Like a thermometer or a camera, diagnostics can tell us if an experiment performed well, take a movie or snapshot of our experiment, and provide us with pieces of information that ...

2023年1月18日 · Two variants of optical imaging velocimetry, specifically the one-dimensional streaked line-imaging and the two-dimensional time-resolved area-imaging versions of the Velocity Interferometer System for Any Reflector (VISAR), have become important diagnostics in high energy density sciences, including inertial confinement fusion and dynamic compr...

2004年8月30日 · The National Ignition Facility (NIF) requires diagnostics to analyze high-energy density physics experiments. A VISAR (Velocity Interferometry System for Any Reflector) diagnostic has been designed to measure shock velocities, shock breakout times, and shock emission of targets with sizes from 1 to 5 mm.

The National Ignition Facility (NIF) requires optical diagnostics for measuring shock velocities in shock physics experiments. The velocity interferometer for any reflector measures shock velocities at a location remote to the NIF target chamber. Our team designed two systems, one for a polar port orientation, and the other to accommodate two

Two line-imaging Velocity Interferometer System for Any Reflector (VISAR) interferometers have been fielded to measure shock velocities, breakout times, and emission of targets sized from 1 to 5 millimeters. A 20-cm-diameter, fused silica triplet lens collects light at f/3 from the targets inside the 10-meter-diameter NIF vacuum chamber.

2014年12月31日 · Physicists Dave Farley (left) and Peter Celliers and layering scientist Curtis Walter watch a live VISAR image as they monitor the deuterium fill of a keyhole capsule in the NIF Control Room during shock-timing experiments. NIF experiments generate enormous pressures—many millions of atmospheres—in a short time: just a few billionths of a second.

VISAR1,2 (Velocity Interferometry System for Any Reflector) measures the velocity of a moving surface by recording its Doppler wavelength shift. The NIF (National Ignition Facility) VISAR...

2003年11月3日 · The National Ignition Facility (NIF) requested an optical diagnostic for measuring shock velocities, shock breakout times, and shock emission of objects with sizes of 1 to 10 mm. For the polar port of the target chamber, an 8-inch triplet lens collects light at f/3 inside a 30-foot-diameter vacuum chamber and uses an optical relay to send the ...

The National Ignition Facility (NIF) requires diagnostics to analyze high-energy density physics experiments. A VISAR (Velocity Interferometry System for Any Reflector) diagnostic has been designed to measure shock velocities, shock breakout times, and shock emission of targets with sizes from 1 to 5 mm.