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Binospec - Next Generation Optical Spectrograph for the MMT

Binospec - Next Generation Optical Spectrograph for the MMT. Daniel Fabricant, Robert Fata, Mark Mueller, Jack Barberis, Tom Gauron, and John Roll. Binospec at a Glance. Dual beams address adjacent 8′ by 15′ fields of view (30′ total slit length) 3900 to 10000 Å spectral coverage

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Binospec - Next Generation Optical Spectrograph for the MMT

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  1. Binospec - Next Generation Optical Spectrograph for the MMT Daniel Fabricant, Robert Fata, Mark Mueller, Jack Barberis, Tom Gauron, and John Roll

  2. Binospec at a Glance • Dual beams address adjacent 8′ by 15′ fields of view (30′ total slit length) • 3900 to 10000 Å spectral coverage • Spectral resolution ~1300 – 5000 with 1″ wide slit • Sampling is 0.22″/pixel on 4K by 4K array

  3. Binospec vs. the World

  4. Scientific Drivers for Binospec Large scale structure and galaxy evolution from z=0-1.4 with [OII]3727 and z=2.2-7 with Ly α Ly α at z~5.8 5.5 hrs with DEIMOS 9 i’ dropouts in 200 sq arcmin GOODS-N field

  5. New Scientific Possibilities with Binospec • Perform slitless spectroscopy to identify PN in nearby galaxies and conduct dynamical studies • Characterize faint Chandra/Spitzer AGN samples beyond reach of Hectospec • Efficiently observe crowded fields that do not use 1º Hectospec format • Carry out programs that require both imaging and spectroscopy. We could explore additional options opened by queue observing.

  6. Binospec Initial Grating Choices

  7. Binospec Imaging FOV ~15′ by 16′, use pair of 7 by 10 inch filters

  8. Binospec Optics MMT f/5 focus 2.9 meters

  9. Binospec Layout

  10. Binospec Layout

  11. Binospec Image Quality

  12. Athermalized Optics Coupling fluid lenses

  13. Flexure Nub Nub Flexure Binospec Lens Mounts Flexure mounts instead of elastomeric mounts: materials compatible with coupling fluid and greater control of axial stiffness

  14. Teflon seals Seal interface rings O-ring Bezel Lens 1 Lens 2 Lens 3 Lens 4 Nub anti-rotation pin Lens 5 Lens 6 Lens 7 Nub Epoxy injection hole Flexure Lens 8 Fold mirror Lens 9 Binospec Collimator Lens Cell

  15. Binospec CCDs Current deep depletion E2V CCDs

  16. Active Flexure Control 512 x 2028 Flexure control CCD Flexure control CCDs will monitor position of fiducial fibers mounted on slit mask assembly.

  17. Active Flexure Control in Operation • Grating tilt for wavelength setting will be controlled by the flexure control system • Flexure and focus shifts will be removed by 3-axis piezo stage in the dewar • Flexure control system will have selectable lamps and a filter wheel to pass only the desired light for flexure control

  18. Binospec on its handling cart Entrance window Electronics boxes CCD electronics Cover/thermal shroud

  19. Changing Slit Masks, Filters and Gratings Filter access Slit mask access Grating access

  20. Changing Filters and Gratings

  21. Binospec Bottom View Grating exchange Grating Camera optics Collimator optics LN2 dewar

  22. Binospec Inverted

  23. Binospec Top View – cover removed

  24. Binospec Focal Plane Area Slit mask cassette Center field acquisition and slit guider Off-axis WFS

  25. Binospec Status • Mechanical design nearing completion: CDR fall 2006. Electronics design is mature. • 10/12 CaF2lenses coated and delivered • 6/6 aspheric lenses nearly complete • Major assembly task of mounting lenses in bezels will be prototyped this summer. • Delivery late 2008/early 2009

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