binospec - next generation optical spectrograph for the mmt
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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Binospec - Next Generation Optical Spectrograph for the MMT
Daniel Fabricant, Robert Fata, Mark Mueller, Jack Barberis, Tom Gauron, and John Roll
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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
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Binospec vs. the World
Spectrograph Field of View (spectroscopy)
Maximum Spectral Resolution
Binospec-MMT 240 sq arcmin ~5000
DEIMOS-Keck 80 sq arcmin ~5000
VIMOS-VLT 224 sq arcmin ~2500
IMACS- Magellan 120 sq arcmin>500 sq arcmin
>5000<2500
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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~5.85.5 hrs with DEIMOS
9 i’ dropouts in 200 sqarcmin GOODS-N field
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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.
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Binospec Initial Grating Choices
Grating Dispersion Resolution 1″ slit
Spectral Coverage
270 gpm 1.17 Å/pixel ~1300 ~5400Å
600 gpm 0.54 Å/pixel ~3000 ~2500 Å
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Binospec Imaging
FOV ~15′ by 16′, use pair of 7 by 10 inch filters
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Binospec Optics
2.9 meters
MMT f/5 focus
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Binospec Layout
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Binospec Layout
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Binospec Image Quality
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Athermalized Optics
Coupling fluid lenses
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Binospec Lens Mounts
Nub Flexure
Nub
Flexure
Flexure mounts instead of elastomeric mounts: materialscompatible with coupling fluid and greater control of axial stiffness
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Binospec Collimator Lens Cell
Lens 1
Lens 2
Lens 3
Lens 4
Lens 5
Lens 6
Lens 7
Lens 8
Fold mirror Lens 9
Teflon seals
Nub
O-ring
Flexure Epoxyinjection hole
Nubanti-rotation
pin
Seal interface rings Bezel
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Binospec CCDs
Current deep depletion E2V CCDs
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Active Flexure Control
512 x 2028 Flexure control CCD
Flexure control CCDswill monitor positionof fiducial fibers mountedon slit mask assembly.
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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
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Binospec on its handling cart
Cover/thermal shroud
Electronics boxes
CCDelectronics
Entrance window
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Filter access
Changing Slit Masks, Filters and Gratings
Grating access
Slit mask access
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Changing Filters and Gratings
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Binospec Bottom View
Grating
Camera optics
LN2 dewar
Grating exchange
Collimator optics
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Binospec Inverted
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Binospec Top View – cover removed
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Binospec Focal Plane Area
Slit mask cassette
Center field acquisitionand slit guiderOff-axis WFS
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Binospec Status
• Mechanical design nearing completion: CDR fall 2006. Electronics design is mature.
• 10/12 CaF2 lenses 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