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NIC FPS Critical Design Review Opto Mechanical Components Mark B Vincent CU CASA 26 July 2002 CASA ARL Boulder CO NIC FPS Critical Design Review Opto Mechanical Components Include Window Lens mounts Etalon Actuator Lyot Stop Filter Wheels FPA Mount CaF2 140 mm diameter 14 mm thick no wedge no AR on exterior surface Collimator w 3 lenses Camera w 5 lenses Linear translator Stationary once aligned Three 7 slot wheels Supplied by Rockwell 26 July 2002 2 NIC FPS Critical Design Review Lens Mounts Collimator and camera in separate Al tubes Collimator camera alignment tolerances 1 mm offset 1 tilt Warm up and cool down rates determined by contact area with bench Individual lenses are held in collet fingers mounts based on the Ohio State University Imaging Sciences Laboratory s ISL design Collet fingers have decenter and tilt tolerances of 50 m which is sufficient for the NIC FPS optics Prototype lens mount provided by University of North Carolina Lens spacing set by spacers between the collet fingers 26 July 2002 3 NIC FPS Critical Design Review Etalon Actuator Will use a cryogenic linear translator of 90 mm travel Wiring is flexible at 77 K will flex our cable extension Limited to 20 mm maximum depth Three options 1 2 3 Commercially manufactured available but insufficient travel O Brien ISL has a design that has worked without failure for a number of years in OSIRIS Design one in house Etalon is mounted perpendicular to beam Etalon itself is mounted by six m4 bolts three on each face These bolts are the sole thermal contacts 26 July 2002 4 NIC FPS Critical Design Review Lyot Stop Cold Lyot stop used to minimize radiation from beyond the primary mirror reaching the FPA Pupil is 40 mm diameter with 4 6 mm central obstruction Recommend undersizing the primary and oversizing the central obstruction by 175 m This is 0 9 by diameter and 1 8 by area Lyot stop is a mask deposited onto a 50 mm diameter 3 mm thick fused silica or CaF2 substrate Zemax runs suggests that once the



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