NGAO Instrumentation Studies
Overview
By Sean Adkins
November 14, 2006
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Presentation Outline
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Study Strategy
Study Plan
Major Objectives
Science Instrument Reuse Trade Study
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Study Strategy
• The NGAO Instruments Working Group (IWG) is formed
– Exists for the duration of the NGAO SD phase
– Focused on instrumentation related matters
• Instrument specialist perspective for NGAO
• Resource for AO system design team on instrumentation issues
– Organization
• 6 to 8 members
• 3 to 4 are funded from current NGAO plan
– Responsible for most of the technical work related to the NGAO instrumentation
WBS
• 3 to 4 are volunteers from the NGAO science team
– Primary contacts with NGAO science team for instrument related science
requirements
• Regular meetings will be held involving the entire group
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NGAO IWG Membership
• Funded positions
Sean Adkins – chair of IWG, overall systems, detectors, electronics and interfaces
Anna Moore – instrument generalist, optical and mechanical
TBD – instrument generalist, optical and mechanical, experience with cryogenics
TBD – software engineer
• NGAO Science Team
TBD
TBD
TBD
TBD
• Additional assistance and advice will be sought from the diverse
base of the collective instrumentation and technical resources at UC
and CIT
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Study Plan
• IWG direct WBS element responsibilities from SEMP
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3.1.2.1.6 Instrument Balance
3.1.2.1.8 Instrument Reuse
3.1.3.3.7 Notional Allocation of Function to Science Instruments Version 1
3.1.3.3.8 Notional Allocation of Function to Science Instruments Version 2
3.5 Science Instruments
• Reuse and Compatibility
• New Instruments
• Other areas where IWG should be involved or consulted
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Instrument requirements in element 2.1
2.2.2 Observatory Interface Requirements
2.2.3 Science Operations Requirements
Various items in elements 3.1, 3.2, 3.3, 3.4
4.4.1.4 Science Instruments Test Plan
4.4.2 System Integration & Test Plans
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Study Plan, cont’d.
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Priorities
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Science instruments re-use
Instrument balance
Near-IR deployable IFU
Imagers
Visible IFU
Preferred solution to near-IR IFU & thermal near-IR imager
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Study Timeline
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Major Objectives
• “…take the science instruments to a proposal level…”
– What constitutes an instrument proposal?
• This is addressed by the WMKO instrumentation development process
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Science requirements analysis and flow down
Derived technical requirements
Use case definition and analysis
Technical analysis
Design
Interface requirements
and
Development
Management
New
Instrument
» Risk analysis and mitigation plan
Proposal
» WBS
Science Need
» Schedule and budget
» Project plan
Delivery
and
Commissioning
Facility Class
Science
Operation
Verification
End of Life –
Decommissioning
– What is the best way to accomplish the objective?
• IWG workups?
• Solicitation of proposals from prospective builders?
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Scope
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Focus on science requirements
– Wavelength Coverage
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Range and bands
– FOV
– Plate Scales
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IFU
Imaging
Spectral Resolution
Sensitivity & background
Residual wavefront error
Auxiliary functions
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Coronagraphs, polarimeters, etc.
– Calibration
– Data reduction
– Packaging
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Orientation of input optical axis
Field derotation
Overall size, weight, power, cooling requirements, etc.
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Current NGAO Instrument List
Single object Instruments
Name
Priority
Near-IR imager
1
Visible imager
2
Near-IR IFU (OSIRIS?)
3
Visible IFU
4
Thermal near-IR imager
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Multi-object Instruments
Name
Priority
Deployable near-IR IFU
1
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Science Instruments Reuse Trade
Study
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Objective
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evaluate the potential for reuse of OSIRIS and NIRC-2 with NGAO
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Estimate the performance of OSIRIS with NGAO in the role of the near-IR IFU
Determine the nature, feasibility and ROM cost of possible improvements to OSIRIS to take advantage
of NGAO such as an increased FOV
Review and summarize the constraints on NGAO design that are imposed by the current OSIRIS ICD
Ditto NIRC-2 as the thermal near-IR imager
Main parameters to be considered
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Wavelength coverage
FOV
Plate scales (IFU and imaging)
Slit size(s) - real and virtual
Spectral resolution(s)
Sensitivity and instrument background
Residual wavefront error
Constraints on NGAO design imposed by instrument ICD
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Packaging - orientation of optical axis, field derotation
Interfaces - input focal ratio, software, etc.
NGAO vs. other telescope AO instrumentation and overall instrument balance
Feasibility and cost/benefit of upgrades for NGAO
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