wfmos as a bridge to the future for gemini & subaru doug simons director, gemini observatory
TRANSCRIPT
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WFMOS as a Bridge WFMOS as a Bridge to the Future for to the Future for Gemini & SubaruGemini & Subaru
Doug SimonsDirector, Gemini Observatory
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WFMOS – Current Status & Next
Steps
Collaborations – Overarching
Considerations
Gemini Design
WFMOS in the Aspen Context
Gemini Fundamentals
WFMOS Negotiations
Gemini/Subaru Science &
Instrumentation
Three Presentations – One Three Presentations – One Message…Message…
Kentaro Motohara Chris Packham
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Gemini Gemini FundamentalsFundamentals
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Two Telescopes - One Two Telescopes - One ObservatoryObservatory
Gemini-NorthMauna Kea, Hawaii
Gemini-SouthCerro Pachon, Chile
To our community, Gemini appears and functions as a single observatory - the only major ground based observatory that is capable of targeting
any object in the sky
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Gemini Observatory Gemini Observatory Management StructureManagement Structure
The Gemini Director has many bosses, some real, others virtual, all important…Requires careful attention,
clear communication, and regular interaction with many key stakeholders
Gemini Board has ultimate authority
AURA provides the business and legal framework within which Gemini functions
Gemini BoardNSF, STFC, NRC, etc.
Executive AgencyNSF
AURAPresident
GeminiDirector
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Mauna Kea
Cerro Pachon
Current Current StatusStatus
Baseline Modes CommissionedInstrument Under Development
GMOS NICI T-ReCS FLAMINGOS-2 GSAOI MCAO
GMOS NIRI ALTAIR+LGS MICHELLE NIFS GNIRS
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Aspen Instrument ProgramAspen Instrument Program
GroundLayerAdaptiveOptics
PrecisionRadialVelocitySpectrometer
GeminiPlanetImager
WideFieldMulti-ObjectSpectrometer
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Aspen Instrument ProgramAspen Instrument Program
GroundLayerAdaptiveOptics
PrecisionRadialVelocitySpectrometer
GeminiPlanetImager
WideFieldMulti-ObjectSpectrometer
High performance coronagraph
~107 contrast ratio Being built by a number
of institutions – led by LLNL
Scheduled for deployment at Gemini-South in 2011
AAO and JPL are now completing competitive design studies for WFMOS
Conceptual design studies will be reviewed Feb. 09
Gemini Board decision regarding proceeding with WFMOS - May 09
Conceptual design studies completed successfully
Instrument procurement canceled due to lack of funding and higher priority given to WFMOS
UH completed site testing in 2008
Results indicate that a GLAO system at Gemini-N would be powerful
Decision to proceed with GLAO 2010?
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IR Optimized Telescope IR Optimized Telescope DesignDesign
IR Optimized Design• f/16 secondary• tip/tilt• chopping
•Telescope structure•Designed to reduce thermal inertia
•Relies on active optics that are always “on”
Primary mirror rests above elevation
axis to increase wind flushing & Cassegrain payload
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IR Optimized Telescope IR Optimized Telescope DesignDesign
4-L
ayer
Pro
tecte
d S
ilver
Coati
ng
s
~3% total emissivity
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IR Optimized Telescope IR Optimized Telescope DesignDesign
Reduced cross-section secondary mirror supports designed to minimize diffracted light in PSF
Typical strehl achieved is 60-75% @ 10 m
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IR Optimized Telescope IR Optimized Telescope DesignDesign
However, the same design features which allow Gemini to excel as an infrared optimized telescope make it difficult to support prime focus instruments (like WFMOS…)
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The Subaru/Gemini The Subaru/Gemini CollaborationCollaboration
Some Overarching Some Overarching Considerations…Considerations…
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Some Overarching Some Overarching Considerations…Considerations…
There is an inevitable trend in science toward international collaboration and Gemini and Subaru are uniquely poised to lead the way among 8-10 m class facilities worldwide
Subaru and Gemini each have unique capabilities that would help the “other” communitySubaru – world class wide field
instrumentation (optical and NIR)…Gemini – IR optimization, all-sky access;
fast response modes…
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Some Overarching Some Overarching Considerations…Considerations…
In general scientific collaborations should be –Mutually beneficialFounded on fair and equitable termsDesigned to provide partners with
research opportunities that they would not otherwise have
Take advantage of natural synergiesTailored to avoid costly capability
duplication between observatories
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Some Overarching Some Overarching Considerations…Considerations…
In many ways the WFMOS initiative is just a catalyst for fostering a scientific collaboration between the Subaru and Gemini communities
If we do not proceed with WFMOS, for any reason, I urge that we continue to nurture future scientific collaboration based on other capabilities unique to Subaru and Gemini
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WFMOS – Current WFMOS – Current Status and Next Status and Next
StepsSteps
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Oct. 2008
WFMOS WFMOS NegotiationsNegotiations
Discussion topics to date have included – Duration of agreement Cost sharing Time exchange
parameters Commissioning and
maintenance considerations
Other related issues…
Motohara-san will summarize negotiations in more detail in the next presentation
Nov. 2008
Dec. 2008
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WFMOS Baseline WFMOS Baseline Design GuidelinesDesign Guidelines
Wavelength Range: 0.39 – 1.0 µm Field of View: ~1.5 deg diameter Spatial Sampling: ~1 arcsec fiber entrance Spectral Resolution: R~1800 – 3500
(~3000 fibers) and R~40,000 (~1500 fibers)
One-shot wavelength coverage: ~0.39 to 1.0 µm (low resolution spectrographs), >100 Å (high resolution spectrographs)
Simultaneous stellar targets: ~4500 Detector operating modes: standard
readout or “nod & shuffle” as required to achieve the science goals.
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WFMOS Trade WFMOS Trade StudiesStudies
WFMOS teams will include in their proposals a number of trades studies to determine the optimal WFMOS design/cost needed to support the science goals of the instrument
Trades can include many things including -Acquisition field sizeVignettingMultiplex gainsTotal survey timeFiber manipulation schemesManufacturing risks for key componentsScience impact of cost-saving reductions in the
baseline WFMOS capabilities
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Two Two WFMOSConceptual WFMOSConceptual Design Study TeamsDesign Study Teams
JPL Team PI Richard Ellis Caltech Penn State ATC Cambridge IofA U. College London LNA Brazil
AAO Team PI Sam Barden NOAO U. Oxford/RAL U. Portsmouth U. Durham Johns Hopkins U. RAL
Two competitive conceptual design studies are being performed by large, international
teams. They will be completed in Feb. 2009
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WFMOS Decision WFMOS Decision ProcessProcess
After the WFMOS Conceptual Design Review (Feb. 22-23) a number of discussions will be held leading to a May Gemini Board meeting decision about proceeding with WFMOSGemini and Subaru will consider the review
committee report jointly before a recommendation is made to Gemini Board
Subaru and Gemini SAC’s will consider science implications of any significant design changes in WFMOS
Draft Subaru/Gemini agreement will be negotiated and submitted for consideration by Gemini Board and NAOJ
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Possible Possible ConcernsConcerns
Number of fibers in WFMOSThe design will include a complex
trade between fiber number, throughput, field of view, etc.
Together these design parameters determine the amount of telescope time needed to complete a survey and the amount of telescope time needed will not be allowed to be prohibitive as design/cost options are weighed
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Possible Possible ConcernsConcerns
Delay in deliveryHistorically Gemini instruments have been
delivered 1-2 years lateTypical of other observatoriesNIFS (2) and GSAOI were Gemini’s best performers,
bHROS and FLAMINGOS-2 our worst
It is in the strategic interests of everyone to ensure that WFMOS is deployed on schedule
If approved, Gemini will increase the size of its development group to help oversee the timely delivery of WFMOS
Gemini and Subaru will interact regularly throughout the development period of the instrument to ensure design trades meet everyone’s needs
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Possible Possible ConcernsConcerns
Funding challengesThe global economic crisis is effecting
essentially all segments of society and astronomy is no different
Gemini funding for WFMOS remains uncertainThe US funding situation in particular
should be clarified in the next ~2-3 months
Funding for Gemini’s operations will be given higher priority than its development program
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Gemini Commitment to Gemini Commitment to WFMOSWFMOS
Today, 5 years after the Aspen Workshop, WFMOS remains the highest priority instrument in Gemini’s development program with strong support from the – Gemini Science Committee Gemini Board of Directors Gemini Community
Both personally and on behalf of Gemini Observatory, I thank you for the opportunity to share these perspectives on Gemini, WFMOS, and hopefully a long lasting scientific partnership between our observatories
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