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Magellan F/5 System Status A.Szentgyorgyi/SAO/25 Sept 2004 Overview • Focus will be optically identical to MMT - 1°, Curved spectroscopy focal plane - 1/2°, Flat imaging focal plane • Atmospheric dispersion compensation • Wavefront sensing & guide function • Shutter & filter handling • “First light” instruments MMIRS and Megacam and capability to serve wide field to MIKE fiber feed Core Elements • Wide field corrector & ADC very similar to MMT. • Instrument adapter to provide interface from MMT mounting to Clay rotator. • Topbox for Megacam shutter & filter handling. • Wavefront sensors included in instrument or topbox functionality. • F/5 Secondary supplied by Magellan. • Software interface to Clay guiding and mirror support software. • Ancillary handling fixtures. Wide Field Corrector Optical Elements Wide Field Corrector Optical Elements Optical Fabrication • Fabrication by Goodrich/Danbury • L1 & L2 and ADCs complete • L3 & L4 complete on 30 Oct 04 AR Coatings Are two viable suppliers of AR coatings for refractive optics this large with two complementary technologies: • Sol Gel coatings by Cleveland Crystals – fragile, but optically superb & trivial recovery from bad coating. • Dielectric multilayers by SAGEM – somewhat more robust, but not quite as good as Sol Gel & bad deposition is catastrophic. Selected Sol Gel for WFC Optics AR Coating • Cleveland Crystal now under contract. • Coating commences 11/11/2004 •Three months to complete Structural and Optical Analyses • S.Gunnels has finished analysis of global deflections of mirror cell. • F. Perez’s has performed a pull test on the Baade rotator bearing. • Henry Bergner calculates bearing is about half as stiff as spec. sheet indicates & finds that the Instrument Adapter is robust. • Hope to get pull test on Clay rotator bearing in Mar. or Apr. • Ordway’s measurement of interfaces was completed 23 Aug 2004. • Will produce detailed performance prediction in next three weeks. • WFC will be a tight fit. • Have measured the diameters and roundness of critical diameters and flatness of axial references in August 04. • Rotation axis of Cass bearing apparently within ~0.001” of center of WFC mounting surface, but ovalized ~0.003” • Mounting holes for WFC are up to 0.035” from true position. • Will fit check the WFC flange in Mar or Apr when tertiary comes out again before lenses are bonded into cells. • Will fit check Instrument Adapter if possible. Lift Fixture Tertiary Lifting Fixture F/5 Lifting Fixture Concept Software • Need to develop interfaces between F/5 wavefront sensor & mirror support system and the Megcam/MMIRS guide CCDS & telescope • S. Schaller will accept raw Shack-Hartmann . and guide images. Electronics • Magellan cable runs are ~3x as long as MMT, so we are required to develop a new controller architecture. • We have minimized size of interface; each subsystem only requires AC, optical fiber & ethernet. • Will need to deliver coolant to modules on Cass rotator. Project Status • All WFC optic done except L3 & L4 - Completion 1 Nov 04 • WFC AR coating done early Feb 05 • ADC bearings complete • Other WFC structures in work. • WFC complete Oct 05 • Topbox in work • Instrument Adapter fab. Starts next two weeks. • Lift table, handling fixtures fab starts Jan 05 Project Status Expect on-schedule delivery in early Jan 2006.