NGAO System Design:
AO System (WBS 3.2) &
Laser Facility (WBS 3.3) Design
Inputs & Outputs
Peter Wizinowich
NGAO Team Meeting #9
August 24, 2007
Presentation Sequence
• Inputs
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KAON summary table (includes all of the inputs)
Management Plan
Requirements (SCRD, SRD, FRD)
Performance Budgets
Trade Studies
System Architecture (see next presentation)
• Outputs
– Conceptual Designs
– Functional Requirements
2
Inputs:
KAONs
http://www.oir.caltech.edu/
twiki_oir/pub/Keck/N
GAO/NewKAONs/K
AON_summary.xls
KAON
303
399
400
414
415
416
417
419
420
427
428
429
452
455
456
459
461
462
463
465
466
468
469
470
471
472
473
474
475
476
480
481
482
483
485
487
490
492
493
494
495
496
497
499
500
501
502
503
504
TBD
TBD
TBD
TBD
TBD
TBD
Title
Mauna Kea Atmospheric Parameters
NGAO Proposal Executive Summary
NGAO Proposal
System Design Phase: Systems Engineering Mgmt Plan
TMT site monitoring data (restricted access)
Atmospheric sodium density from Keck LGS photometry
Sodium abundance data from Maui Mesosphere
Simple models for the prediction of Na LGS brightness &
comparison to measured returns from Gemini & Keck
Accessing the MK TMT seeing & weather data (restricted)
Variable vs fixed LGS asterism
Implications & requirements for Interferometry with NGAO
LGS asterism geometry & size
MOAO vs MCAO trade study
Science Case Requirements Document (SCRD)
System Requirements Document (SRD)
NGAO System Design Phase Report #1
Wavefront error budget predictions & measured performance for
current & upgraded Keck AO
Keck AO upgrade trade study
Lessons learned on LGS operations: weather impact, …
NGAO LGS wavefront sensor: Type & number of subapertures
Computer simulations of AO PSFs for NGAO
Algorithm for reconstruction of Keck telescope segment figures
Effect of segment figure errors on Keck AO performance
NGAO sky coverage modeling
Wavefront Error Budget
GLAO for non-NGAO instruments
NGAO System Design Phase Report #2
Photometry for NGAO
Tomography Codes Comparison and Validation for NGAO
Observing Models Trade Study
Astrometry for NGAO
System Design Phase Mid-FY07 Replan
Keck Telescope Wavefront Error Trade Study
Keck Interferometer Support Trade Study
Adaptive Secondary Mirror Trade Study
LOWFS Architecture Trade Study
Rayleigh Rejection Trade Study
Null-mode & Quadratic Mode Tomography Error
Science Instrument Reuse Trade Study
NGAO System Design Phase Report #3
Summary of NGAO Trade Studies
MK turbulence statistics from the T6 MASS/DIMM (restricted)
High-contrast & companion sensitivity performance budget
NGAO System Architecture definition
Keck AO upgrade feasibility
NGAO background & transmission budgets
Keck AO Upgrade engineering costs basis
Mauna Kea Ridge turbulence models
Performance vs technical field of view for LOWFS
Functional Requirements Document (FRD)
D-IFU & LOWFS & object selection Trade Study
Uplink compensation
Preliminary risk evaluation
Cascaded relay preliminary opto-mechanical design
Split relay evaluation
Program RequireModel
Perfor- AO Trade Laser
Mgmt
ments Validation mance Study (TS)
TS
x
x
x
x
x
x
x
OperInstruSystem
ations TS ment TS Architecture
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
3
x
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x
Management Plan
• System Design Phase Planning
http://www.oir.caltech.edu/twiki_oir/bin/view.cgi/Keck/NGAO/SystemDesignPhasePlanning
• WBS dictionary defines each WBS element
See appendix 9 of KAON 414 Systems Engineering Management
Plan (SEMP)
http://www.oir.caltech.edu/twiki_oir/bin/viewfile.cgi/Keck/NGAO/SystemDesignPhasePlanning?rev=2;filename=
NGAO_SD_System_Eng_Mgmt_Plan_v20.doc
• MS Project Plan defines WBS elements, resources &
schedule (see KAON 481 for mid-year replan)
http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/SystemDesignPhasePlanning/NGAO_SD_schedule_v26.mpp
See next 2 slides
• See previous presentation for design phase management
details
4
Management Plan – WBS 3.2
5
Management Plan – WBS 3.3
6
Inputs: Requirements
• Overview of Requirements documents
http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/070824_Remote_NGAO_Meeting_9/Overview_of_NGAO_Requirements_Documents.doc
• Science Case Requirements Document (SCRD)
http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/NewKAONs/NGAO_SCRD_Release1.pdf
– 1-page science requirements summary (next slide)
http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/070824_Remote_NGAO_Meeting_9/Architecture_reqments_summary_v7.xls
• System Requirements Document (SRD)
http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/NewKAONs/KAON456_NGAO_SRD_v1.13.doc
– Instrument Baseline Requirements Document
http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/WorkProducts/Baseline_Requirements_Document.doc
• Functional Requirements Document (FRD)
http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/WorkProducts/KAON_NGAO_FRD_v0.1.doc
– Sample: section 7.2 from draft FRD
http://www.oir.caltech.edu/twiki_oir/bin/viewfile.cgi/Keck/NGAO/070824_Remote_NGAO_Meeting_9?rev=1;filename=Sec72_AO_Enc
OpticalRelay.doc
7
Inputs:
Science
Requirements
http://www.oir.caltech.edu/twiki_oir/pub
/Keck/NGAO/070824_Remote_
NGAO_Meeting_9/Architecture
_reqments_summary_v7.xls
Requirement
l (µm)
Field of view diameter (")
Field of regard diameter (")
Pixel size (mas)
Minimum # of IFUs
IFU separation
AO Background
Sky coverage
High order WFE (nm) for ≤ 5" fov
Tip/tilt error (mas)
50% Ensquared energy (mas)
Companion sensitivity
Photometry (mag)
Astrometry (mas)
Polarimetry (%)
PSF estimation
Differential tracking
Acquisition accuracy (mas or %
of instrument field)
Dither dist (" or % of inst field)
Dither accuracy (mas)
Dither time (sec)
Micro dither distance (mas)
Micro dither accuracy (mas)
Micro dither time (sec)
Nod reacquisition time (sec)
Positioning knowledge (mas)
Science image drift (mas/hr)
NGS mode
AO instrument switching
AO backup switching
Science Cases
S1a
S1b
S2
S3
S4
G1
G2a
G2b
X1
X2
X3
X4a
X4b
Visible
Imager
Spectrograph
0.7-1.0
0.7-1.0
≥3
≥ 2 (goal ≥ 3)
na
na
≤ 7 (Nyquist at R)
na
na
na
na
na
na
na
≥ 30% for X3
≥ 30% for X3
≤ 170
≤ 170
≤ 15
≤ 15
na
≤ 25
Near-IR
Imager
Spectrograph
1.0-2.4 (+Y&z)
1.0-2.4 (+Y&z)
≥ 15 for X4b
≥4
na
na
≤ 13 (Nyquist at J)
na
na
na
na
na
≤ 30% of total
≤ 30% of total
≥ 30% for X1,X3,X4b
≥ 30% for X3,X4a
≤ 170
≤ 170
≤ 15 for sky cover; ≤ 3 for G2
≤ 15
na
≤ 25
DH ≥ 5.5 at 0.5" for S1b; DJ
≥ 8.5 at 0.1" & DJ ≥ 11 at
DI ≥ 7.5 at 0.75" for S1b
na
0.2" for G1
na
g: ≤ 0.05 relative for
na
≤ 0.05 relative for S1&G1
na
≤ 1.5-2 for S1b&G1; ≤ 0.1
≤ 1.5 relative for S1b
na
for G2a
na
na
na
required
goal
required
goal
required
required
required
required
≤ 10% for IFU; ≤
≤ 10% for IFU; ≤
≤ 10%
0.25l/D for slit
≤ 10%
0.25l/D for slit
≤ 3"? or 65%
≤ 3"? or 65% of field
≤ 5"? or 33%
≤ 3"?, or 65%
≤ l/D
≤ l/D
≤ l/D
≤ l/D
≤3
≤3
≤3
≤3
≤ 0.5l/D
≤ 0.5l/D
≤ 0.5l/D
≤ 0.5l/D
≤ 0.25l/D
≤ 0.25l/D
≤ 0.25l/D
≤ 0.25l/D
≤3
≤3
≤3
≤3
≤ 10?
≤ 10?
≤ 10?
≤ 10?
≤ 0.1l/D
≤ 0.1l/D
≤ 0.1l/D
≤ 0.1 l/D
≤5
≤5
≤5
≤5
required
required
required
required
to vis spectro
to vis imager
to NIR spectro (goal: vis) to NIR imager (goal: vis)
goal: to NIR instrument goal: to NIR instrument
not required
not required
S1b,S2,S3,X3
X3
S1,S3,S4,G1,G2a,X1,X3,X4b S4,G1,G2b,X3,X4a
Science Cases
Asteroid companions survey
Asteroid companions orbit determination
Asteroid size and shape
Moons of giant planets
NGS observations of Neptune & Uranus
Planets around low mass stars
General Relativity & the Galactic Center - astrometry
General Relativity & the Galactic Center - radial velocities
QSO host galaxies
High-z galaxies
Nearby AGNs
Distant galaxies lensed by galaxies - spectroscopy
Distant galaxies lensed by galaxies - imaging
Near-IR
Deployable IFU
1.0-2.4 (+Y&z)
≥1x3
≥ 120
≤ 35 (2 pixels/spaxel)
4
> 1 IFU in 10x10"??
≤ 30% of total
≥ 30% for X2
derived
derived
≤ 70
Interferometer
J,H,K,L (N-band goal?)
≥1
≥ 60
na
na
na
na
na
≤ 250
≤ 15
na
na
na
na
na
na
na
PSF spectrum reqd
goal: 1 tip/tilt sensor
na
na
not required
not required
≤ 10% (≤ 35 relative)
≤ 2" or 65%
≤ 70
≤ 10
≤ 35
<10
≤3
≤ 30?
≤5
≤5
single IFU
not required
single IFU
G2b,X2
≤ 200 mas
na
na
na
Color code
Physical requirements
Performance requirements
Operational requirements
Science cases
Other
Goal: AO transmits Ha to visible instruments
NGS WFS field of regard ≥ 15" (science field)
Interferometer req'ments must be met by a
NGAO mode (matched field, polarization, etc. for
non-AO backup required for all cases
Goal: Provide full field (20" vis, 40" NIR) to 2k
Nyquist sampled detector
Fixed field & fixed pupil modes required
Tip/tilt & LGS acquisition capabilities required
Alignment, calibration & diagnostic tools req'd
na
≤5
required
not required
goal: to NIR instrument
Seeing Assumptions
All values at λ = 0.5 µm
Challenging NGAO
37.5th percentile
r0 = 14 cm; q0 = 2.15"
Median NGAO
62.5th percentile
r0 = 18 cm; q0 = 2.9"
Good NGAO
87.5th percentile
r0 = 22 cm; q0 = 4.0"
8
Outputs
The AO system & laser facility design efforts are expected to produce the following:
• A revised & complete set of functional requirements for each WBS element
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These will be incorporated into the FRD (they should be provided in the FRD format)
FRD configuration management is TBD
•
•
•
•
One or more design concepts for each WBS element that demonstrate
feasibility to satisfy the functional requirements
A KAON documenting the products of each WBS element
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•
•
Likely 1 person to approve/release minor changes & draw major changes to EC’s attention
These can include redistribution of the performance budgets
Especially, the design concept & its evaluation versus the functional requirements
Also, results of any trades or analyses, identification of any issues and/or technical
risks & suggested risk mitigation
Appropriate WBS elements can be grouped together in a KAON
These KAONs will be used as a basis for the preliminary design
Cost information is not an expected output of this phase, however any relevant
cost information should be provided for inclusion in WBS 4.1.2 (costing)
The overall design will be documented in the System Design Manual (SDM)
with reference to the KAONs and FRD
9