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Combining a Thermal-imaging Diagnostic with an Existing Imaging VISAR Diagnostic at the National Ignition Facility (NIF).

Lynn G. SeppalaBrian J. MacGowanPeter M. CelliersRonald B. RobinsonRobert M. MaloneTony L. LeePhillip W. WattsJohn R. CelestebBrent C. FroggetaRobert L. GuytonMorris I. KaufmanEdmund W. NgImants P. ReinbachsTom W. Tunnell

出版	United States. Department of Energy, 2005
URL	http://books.google.com.hk/books?id=7O7MjwEACAAJ&hl=&source=gbs_api

註釋Optical diagnostics are currently being designed to analyze high-energy density physics experiments at the NationalIgnition Facility (NIF). Two independent line-imaging Velocity Interferometer System for Any Reflector (VISAR)interferometers have been fielded to measure shock velocities, breakout times, and emission of targets having sizes of1-5 mm. An 8-inch-diameter, fused silica triplet lens collects light at f/3 inside the 30-foot-diameter NIF vacuumchamber. VISAR recordings use a 659.5-nm probe laser. By adding a specially coated beam splitter to theinterferometer table, light at wavelengths from 540 to 645 nm is spilt into a thermal-imaging diagnostic. Because fusedsilica lenses are used in the first triplet relay, the intermediate image planes for different wavelengths separate byconsiderable distances. A corrector lens on the interferometer table reunites these separated wavelength planes toprovide a good image. Thermal imaging collects light at f/5 from a 2-mm object placed at Target Chamber Center(TCC). Streak cameras perform VISAR and thermal-imaging recording. All optical lenses are on kinematic mounts sothat pointing accuracy of the optical axis may be checked. Counter-propagating laser beams (orange and red) are used toalign both diagnostics. The red alignment laser is selected to be at the 50 percent reflection point of the beam splitter. This alignment laser is introduced at the recording streak cameras for both diagnostics and passes through this specialbeam splitter on its way into the NIF vacuumchamber.