M2FS: Michigan/Magellan Fiber System

1. M2FS: Michigan/Magellan Fiber System

2. M2FS (Michigan/Magellan Fiber System) • Fiber-fed MOS w/2 independent and identical spectrograph arms • 256 total fibers + manual plug plates • 128 Fibers per Arm • HiRes (R=18-34k) and LoRes (R~500-8000) Modes (can • be used independently on separate arms) • Single and multi-order spectroscopy supported in HiRes Mode • 30 arcmin diameter FoV (fully accessible to all fibers) • Aperture size = 1.2 arcsec (diam) • Minimum fiber spacing = 12 arcsec (center-center) • Any fiber can be deployed to any position in field • Target position lead-time is about 4-6 weeks to fabricate plates. • 1 km/s precision anticipated at V=21-22 for late-type stars. • LoRes targets to V=24-25 within aperture. • Target M2FS delivery date to Magellan: Apr-Jun 2012 • Science operations aimed to start in 2012B semester • Prototype robotic positioner planned and full automated plugging • may be possible by 2014 pending funding.

3. Project Status: Fibers • Fiber construction is proceeding full-time at UM. • 418 Fibers have completed first construction stage (10 ft • tubing with end hypos, apppropriately epoxied) • Polishing underway; eight-fiber polisher built for this purpose. • Initial interferometric tests => flat to <1/4 wave. • All fiber ends to be AR coated (first test run went well); • tested interferometrically (thanks Gabor Furesz); tested for • FRD performance. • Goal: 256 prime science fibers + >64 science spares + 20 • acquisition fibers. • Tetris ends under design and trying to find vendors. • Finding vendors for ferrules is proving hard. • Modulo ferrules: Construction/Testing by end of June; all fiber parts by end of September.

5. Project Status: Prime Optics • Optical Design Review passed July 2010. • Echelle gratings in hand. • All M2FS major transmissive spectrograph optics ordered • through AR coating. • CaF2 blanks shipped to opticians (OSI for asphere and HJOL) • Assuming no breakage, all prime optical elements in hand by • Oct/Nov. • Triplet construction in Jan/Feb 2012. • Wide-Field Corrector optics pending order with formal appro- • val from NSF. • M2FS telecentrator from MMFS. DECOMISSIONS MMFS. • Mechanical design to be completed by Sep 2011. Lenses to be • completed by Nov/Dec. • Construction/Mouting of all optics by end of Mar/Apr 2012.

8. M2FS Wide-Field Corrector

9. Project Status: Mechanical • Fiber mount largely a copy of MMFS, even to use some parts. • Mechanical design of major spectrograph components underway: • Grating exchange stage and grating mounts. • Prime optics mounts (largely derivative from PFS). • CCD dewar mount bulkhead which also supports the filter • exchanger, fiber-locator system, shutter, fiber cradle. • Design of fiber shoe and fiber end mounts underway. • Conceptual design for calibration unit/FLS projector in the • secondary cage in place. To work closely with LCO on design and • testing/deployment. • Construction and testing at OCIW. • Design Review in August. Fabrication of principal compo-nents from Aug 2011-Feb 2012 at OCIW and UM shops.

10. Magellan Elevation Ring Spectrograph 2 CCDs LoRes Grating Fiber Injection Cam/Coll Optics Echelle Grating Spectrograph 1

11. Project Status: Electronic • E2V CCDs to arrive in May 2011; IT will install in dewars at OCIW. • Design/performance goals just now beginning in earnest. • Surprising number of controls: • Grating tilts, azimuth (echelle only) x 2 • Grating stage translation x 2 • Filter position, vertical and insertion x 2 • Fiber locator system mirror insertion x 2 • Shutter x 2 • Spectrograph focus (derivative from PFS) x 2 • Fiber slit assemblies x 16 • CCD control x 2 • Guider focus, SH periscope optics, SH camera • Guide camera • Calibration lamps, FLS projector • Initial controls meeting on Apr 29 (Friday) to identify issues, people, software demands and basis for a realistic schedule.

12. Project Status: Performance