binospec and future mmt optical spectroscopy
TRANSCRIPT
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Binospec and future MMT optical spectroscopy
BK7 Entrance Window
Insulated Cover
Handling Cart
Daniel Fabricant
Wednesday, May 19, 2010
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Binospec Design Goal
Build the most powerful spectrograph for deep optical surveys on an 8 meter class telescope
Power calculated by
P = Telescope Area · Throughput · FOV
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Binospec in a Nutshell
• 3900-10000 Å wavelength range for imaging (g r i z) and spectroscopy
• 0.24″ pixel sampling• 200 mm collimated beam diameter – all refractive optics• Two identical beams observing adjacent 8′ by 15′ fields
• Continuous wavefront sensing maximizes image quality• Active flexure and focus control
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Scientific Goals for Binospec
Three major themes have emerged:
(1)Near-Field Cosmology: Deep Studies of the Nearby Universe
(2) The High-Redshift Universe
(3) Transients and Transient Hosts
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Binospec Operations
• Queue scheduling like the Hectos
• Full implementation of “piggy-back” projects to use all of the available slits and coordination of survey projects
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Binospec Dual-Beam Optical Layout
Slit maskPeriscope fold mirrors
CollimatorCamera
Filter
Third Fold MirrorCCD
Grating
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Binospec Spectroscopic ModesGrating Ruling
Order SpectralCoverage
(Å)
DispersionÅ/ pixel
Pixelsfor 1″slit
Resolutionfor 1″ slit
270 1 3900-9240 1.30 3.75 1340
600 1 4500-6960 0.60 3.47 2740
600 1 6000-8480 0.61 3.32 3590
600 1 7255-9750 0.61 3.20 4360
632 2 6405-7590 0.29 2.56 9427
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Imaging Spectrographs and Fiber-Fed Spectrographs
• Imaging spectrographs (Binospec) preserve spatial information perpendicular to the dispersion
– Offer high fidelity sky subtraction– Small-scale kinematic information available– Operate as imagers– Offer the highest throughput
• Fiber-spectrographs (Hectospec) address the largest possible FOV
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Binospec Offers Spatially Resolved Spectroscopy
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Binospec’s Very Large FOV
15′ (150 mm)
8′ (80 mm)
1.33′ (13 mm)
1.26′ (13 mm)
1.68′ (17 mm)
Wave Front Sensor
X
Y
Guide strips
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Binospec Aperture Mask
Up to 300 slitlets each 6″ long
Channel 1 Channel 2
15′
8′
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Binospec’s Camera Optics
Lens 1
Lens2
Lens3
Lens4
Lens5
Lens6
Lens7
Lens8
Lens9
Binospec (2008)
Big optics allow:
Huge field of viewHigher resolution
Calcium fluoride lenses
Aspheric lens
360 mm
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Binospec Offers Very High Throughput
Binospec
Hectospec
Telescope/Corrector optics included
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Future of the MMT – before GMT
The 6.5 meter telescopes must provide our access to faint object spectroscopy
– Binospec will be the workhorse dark time instrument, combining spectroscopy and imaging to support observation of transients in the standard queue (fewer instrument changes)
– Binospec will be simpler to maintain than Hectospec, minimizing operations costs
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Binospec Interior View
Filter Cassette
Optical Bench
Mounting Flange
Focal Plane Bench
Slit Exchange Cassette
A-frame Strut
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Binospec Optical Bench
Dewar
CCD HousingGrating on Turntable
Grating Storage
Third Collimator Fold Mirror
Camera
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Slit Mask Assembly
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Grating Assembly
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Oil-Coupled Doublet Prototype
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Binospec Status
• Aiming for delivery early 2013 – contingent on funding
• Optics complete by end of 2010, high risk aspherics and CaF2 lenses already in hand. Major mechanisms and optical mounts prototyped and tested
• Main structure out for bid mid-June
• Major mechanisms completed: grating assembly, slit mask. Wavefront sensor under construction followed by single object guider. Main electronics assembly under construction
• Optical alignment equipment fully developed and tested on prototype optics, used for MMIRS
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Binospec allows MMT scientists to lead in fields now dominated by DEIMOS/Keck
• Binospec gathers 65% of the light that DEIMOS collects per unit time
• Binospec has twice the slit length and three times the field of view of DEIMOS
• Power of Binospec = 1.3 to 2.0 Power of DEIMOS
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The end
BK7 Entrance Window
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Wednesday, May 19, 2010
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Binospec Exterior View
BK7 Entrance Window
Insulated Cover
Handling Cart
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December 2007 Final Design Review
Chaired by Steve Shectman
“The design of the spectrograph in general impressed the committee to a very high degree”
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Binospec uses all of the MMT’s available instrument volume and all of its weight carrying capacity to maximize throughput and FOV
3.26
156.80
Telescope Pivot
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Large Calcium Fluoride Lenses
The closest approach to a perfect lens
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Binospec Design Elements
• Large optics for large FOV, high resolution, wide spectral coverage
• Few glass-air surfaces with the best possible coatings• Very efficient detectors
• Robust mechanisms enhance reliability• Active flexure control for maximum data quality
Wednesday, May 19, 2010