NGAO System Design Phase
Update
Peter Wizinowich, Rich Dekany, Don Gavel, Claire Max, Sean Adkins
for NGAO Team
SSC Meeting
February 20, 2008
Presentation Sequence
•
•
•
•
Management
Science Case Requirements
System Design
Summary
2
Management
10/1/06
4/21/08
PDR
System
Design
Started
System
now Design
Review
Project Update
•
Report 6 submitted to Directors on 2/4/08.
http://www.oir.caltech.edu/twiki_oir/bin/view.cgi/Keck/NGAO/SystemDesignPhasePlanning
•
Emphasis during this report period has been on:
–
Subsystem design (Sept. – Feb.)
•
–
•
Project replan & science case requirements
NSF TSIP funding awarded for preliminary design phase
–
–
•
Systems Engineering Management Plan (Jan. – Mar.)
Other major completed activities:
–
•
Including updates to the functional requirements
$2M of $2.7M preliminary design budget
MOU for telescope time complete. Contract being drafted.
No news yet on ATI proposal
4
System
Design
Milestones
#
MILESTONE
DATE
STATUS
1
SD SEMP Approved
10/9/06
Complete
2
SD phase contracts in place
10/27/06
Complete
3
Science Requirements Summary
v1.0 Release
10/27/06
Complete
4
System Requirements Document
(SRD) v1.0 Release
12/8/06
Complete
5
Performance Budgets Summary
v1.0 Release
6/15/07
Complete
6
SRD v2.0 Release
5/22/07
Nearly complete
7
Trade Studies Complete
6/22/07
Complete
8
SRD
v3.0 Release
9/7/07
Not started
9
System Design Manual (SDM)
v1.0 Release
9/21/07
Complete
10
Technical Risk Analysis
V1.0 Release
9/21/07
Complete
11
Cost Review Complete
12/7/07
In process
12
SDM
v2.0 Release
2/12/08
In process
13
System Design Review
Package Distributed
3/4/08
New date: 3/18/08
14
System Design Review
3/31/08
New date: 4/21/08
15
SDR Report & Project Planning
Presentation at SSC meeting
4/14/08
New date 4/30/08 5
Requirements 
Performance Budgets +
Trade Studies 
System Architecture +
Functional Requirements 
Subsystem Design +
Functional Requirements 
Management Plan
(post-SDR)
Schedule & Budget
Schedule: 73% of System Design Phase work complete through Jan.
–
48% of remaining work is system design. Wrapping up at conceptual level.
Budget: 89% of SD Phase budget ($1170k) spent through Jan.
6
System Design Review
•
•
Date: April 21, 2008.
Reviewers:
–
–
–
–
–
–
•
Review will follow WMKO guidelines:
–
–
–
•
Brent Ellerbroek (TMT)
Bob Fugate (formerly of SOR)
Andrea Ghez (UCLA)
Norbert Hubin (ESO, Chair)
Nick Scoville (Caltech)
Gary Sanders (TMT)
SDR package distributed with 2 weeks for reviewer comments
Reviewer response distributed prior to review & final agenda set
SDR will focus on issues identified by reviewers
Charter & draft materials can be found at
http://www.oir.caltech.edu/twiki_oir/bin/view/Keck/NGAO/SystemDesignReview
7
Science Case Requirements
Progress on Defining Science Requirements
• Release 2 of the Science Case Requirements Document
is complete
• Release 2 of System Requirements Document is almost
complete
– Observatory requirements further developed
– Remaining tasks identified and assigned
– David Le Mignant & Liz McGrath supporting this effort
9
Updated Science Requirements Summary
10
Each Science Driver has a “Requirements Table”
• Summarizes requirements
discussed in text and figures
• Formatted for input into
System Requirements
Document and into the
Contour Database of
Functional Requirements
• Example: part of the
Requirements Table for HighRedshift Galaxies
11
Progress on Science Cases
• Key Science Drivers: new analysis and content
– Galaxy Assembly and Star Formation History: analysis of cooling requirements to
decrease background
– Nearby Active Galactic Nuclei: discussion of required spatial resolution
– General Relativity Effects at the Galactic Center
– Extrasolar Planets around Low-Mass Stars: definition of 3 target sets with distinct
requirements
– Multiplicity of Minor Planets: optimum wavelengths and sampling
• Science Drivers: new analysis and content
–
–
–
–
QSO Host Galaxies
Gravitational Lensing (by galaxies and clusters)
Characterization of Gas Giant and Ice Giant Planets & their Moons
Backup Science (be sure we can do good NGS science when laser can’t be
used)
12
NGAO System Design
AO Opto-Mechanical Design
NGS
WFS
Rotator
Visible
Imager
DM2
DM1
to OSIRIS
NIR
Imager
Deployable
IFS
LGS
WFS
14
AO Wavefront Sensor Design
LGS pickoff & WFS
Tip-Tilt Sensor
15
System Configurations
Science Cases
drive the AO
system
configurations
(i.e., required
hardware &
control)
#
Key Science Drivers
1 Minor planets as remnants of early Solar System
Survey
Orbit Determination
2 Planets around low-mass stars
Survey
Spectra
3 General Relativity at the Galactic Center
Astrometry
Radial Velocities with dIFS
Radial Velocities with OSIRIS
4 Black hole masses in nearby AGNs
5 High-redshift galaxies
#
Science Drivers
1 Asteroid size, shape, composition
2 Giant Planets and their moons
Imaging
Spectroscopy
3 Debris disks and Young Stellar Objects
Imaging
Spectroscopy
4 Astrometry in sparse fields
5 Resolved stellar populations in crowded fields
6 QSO host galaxies
Imaging
Spectroscopy
7 Gravitationally lensed galaxies by other galaxies
Imaging
Spectroscopy
8 Gravitationally lensed galaxies by clusters
Imaging
Spectroscopy
9 Backup Science
Faint NGS science
Seeing-limited science with acquisition camera
NGS Configuration
Primary Secondary
LGS Configuration
Primary Secondary
4e
5a
4a-d,4f
4ef,5b
4c-f,6c-f
6c-f,4c-f
4a
1
6ac
Vis spectra
1
4a
6a
4ab
6ab
5a, 7a
4c
6ce
5a
4e
4ace
6ace
5a, 7ace
4a-f
6a-f
4ace
4ace
4ace
6ace
4ace
6ace
5a
4ace
1
9ab
16
System Configurations
#
Configuration
LGS Science Modes
1
d-IFS
4a
4b
4c
4d
4e
4f
NIR Camera
5a
5b Visible Camera
#
Science
Science Field
Rotator
λ
Diameter Mode
Projected
LGS
Asterism
LGS
Asterism
Rotation
≤ 120"
≤ 30"
≤ 2"
≤ 30"
≤ 2"
≤ 30"
≤ 2"
≤ 30"
≤ 2"
Wide
≤ Medium
Narrow
≤ Medium
Narrow
≤ Medium
Narrow
≤ Medium
Narrow
Yes for field
Yes for field
No, fixed
Yes for field
No, fixed
Yes for field
No, fixed
Yes for field
No, fixed
z-K
K
H
z-J
0.7-1µm
LOWFS LOWFS 1st relay PSF
& PSF
+
Truth Monitor
ADC Tweeter Sensor +Tweet
LGS Science
1 Tracking
4a
4b
4c
4d
4e
4f Tracking
5a
5b Tracking
Modes
3
3
1 on-axis
3
1 on-axis
3
1 on-axis
3
1 on-axis
Yes
Option
Unlikely
Option
Unlikely
Option
Unlikely
Option
Unlikely
Option
Option
Unlikely
Option
Unlikely
Option
Unlikely
Option
Unlikely
d-IFS
Fixed field
Fixed field
Fixed pupil
Fixed field
Fixed pupil
Fixed field
Fixed pupil
Fixed field
Fixed pupil
2nd
NGS
Interfero
Relay
WFS
meter OHANA Tweeter Dichroic
Woofer
LGS
LGS
Acquis
dichroic
Fold
Yes
In
Out
Yes
In
Out
Yes
In
Out
NGS
Field
Visible Steering 2nd FSM
ADC
Tracking Position
NGS
WFS
LGS
WFSs
Post Relay
1 Dichroic
9
9
6
9
6
9
6
9
6
Out
JH transmit
/ K reflect
J transmit /
H reflect
H transmit
/zJ refl
JH transmit
/ vis reflect
2nd relay Visible
Truth
Imager
Sensor Dichroic
Visible
Imager
ADC
Interferometer
Fold
NGS LOWFS/T
Acquis WFS Diff
Fold Tracking
Out
Out
Out
Out
Out
Out
Visible
Imager
NIR
ADC
No
Option
No
Option
No
Option
No
Option
No
OSIRIS
NIR
Fold OSIRIS Camera
Yes
Yes
Yes
Out
Out
Option
Track or
out
Option
TWFS
TWFS
Yes
on-axis
Yes
on-axis
Yes
on-axis
Yes
on-axis
Out or IR
trans
Vis reflect
Track or
out
Track or
out
Out
Yes
Yes
17
Summary
•
Management
–
–
–
–
•
Replan for remainder of system design phase completed
Good progress on Systems Engineering Management Plan
On track for System Design Review
NSF TSIP funding for preliminary design!
Technical:
– Subsystem design phase completed
– Functional requirements completed
Team remains committed & excited about NGAO!
18