Transcript 8 m Club Meeting

Keck Laser Guide Star
Adaptive Optics System:
1st & 2nd Milestones
AOWG Telecon
Oct. 17, 2003
A. Bouchez, J. Chin, A. Contos, S. Hartman, E.
Johansson, R. Lafon, D. Le Mignant, P. Stomski,
D. Summers, M. van Dam, P. Wizinowich
Topics
 Review 1st light results
 Preliminary definition of 2nd light
milestone & progress
 Other priorities
LGS AO Top-level Milestones
 Top-level milestones (as of fall/02):

03Q4 - 1st corrected images on NIRC2 with laser
• Achieved Sept. 18 & 19, 2003





04Q1 – LGS AO facility operable by AO experts
04Q2 – 1st engineering science
04Q3 – 1st shared risk science
05Q2 – Operable for science
by OA & 1 expert
05Q3 – 1st queue scheduled
science observing
First LGS Milestone Definition

Definition of the first corrected LGS AO images on NIRC2 (KAON

Success Criteria: Achieve a Strehl ratio > 0.2 in Kp for the AO
corrected image in the following situation:
 NIRC2 image with an exposure time > 30 sec.
 Down tip/tilt loop closed on a NGS V > 13 mag.
235) .
•

•
Higher order loop closed on the LGS.
Average seeing conditions.
•


Excellent to extraordinary seeing.
Telescope elevation > 60 & < 80.
Science object < 5 arcsec from NGS star. NGS < 10 arcsec off the
image rotator axis.
•

Achieved SR = 0.25 in Kp on a V = 14 NGS.
Both NGS and LGS on-axis for 1st light.
Rotator in vertical angle mode at optimal angle for laser.
•
Also demonstrated in position angle mode.
First LGS Results (UT 9/20)
“Audentes Fortuna Juvat” Virgile
Extraordinary seeing
HK T Tauri B (UT 9/20)
The star shown at the bottom
right is the 106 yr old classical T
Tauri star HK Tau A. HK Tau
B at top left is believed to lie in
the dark lane of a circumstellar
disk.
•NGS Vmag = 15
•Strehl = 4% at H & 12% at K’.
•FWHM = 0.14, 0.11 & 0.13 mas
at H, K’ & L’.
•Exposure time = 30, 40 & 72 sec
at H, K’ & L’.
•Position angle = 145
•240 counts from LGS on
wavefront sensor at 500 Hz
3 color image: H, K’ & L’ are
blue, green & red, respectively.
The LGS AO Team in Celebration
Acquisition Camera image of the LGS
(UT 9/19 after optimization)
LGS
LGS FWHM
varied from 1.4 to
1.8 arcsec
Altitude ~ 88 km
Rayleigh scatter
Acquisition Camera image of the LGS
with the primary mirror unstacked
LGS best segment
FWHM from 1.4”
when stacked
image was 1.7”
Significant Technical Progress
(in support of this milestone)
 STRAP operational standalone as tip/tilt sensor
 LBWFS operating in 1x1 & 2x2 pixel binning





Providing focus to WFS stage & centroids for optimization
Wavefront sensor tracking versus elevation
Image sharpening based on LBWFS centroids successful
Laser image quality & power fairly stable
Laser diagnostics operational

LGS size qualitatively correlated with pointing & PIB images
 Laser pointing with M3
 Operation scheme & prelim automation successful
 Plus:



Laser Traffic Control System operational
EPICS upgrade for WFC command processor operational
K2aoserver operational for idl & Java tools (from HQ)
LGS AO Control
Light from
Telescope
Offload to telescope
Tip/tilt
LGS
NGS
IR transmissive
dichroic
Science
Camera
Offload
focus to
telescope
Wavefront
Controller
Sodium
transmissive
dichroic
STRAP
Lenslets
WFS
LBWFS
(Tip/tilt
to Laser)
Focus
Centroids
(Subaperture gains)
TSS x,y,z stage
Pupil Orientation
Laser
Diagnostics
Error Budget
# Error Term
RMS Error (nm)
NGS
LGS
113
113
128
128
60
60
1 Camera
2 Fitting
3 Telescope
4 Bandwidth - TT
128
128
5 Bandwidth - DM
80
80
80
105
0
0
0
100
105
112
239
150
11 Telescope focus
0
30
12 Measurement - laser jitter
13 Measurement - TT
14 Other LGS
0
0
0
50
40
70
RSS =
270
423
Strehl at 2.1 um =
0.52
0.20
6
7
8
9
10
Measurement
Other NGS
Measurement -elongation
Focal Anisoplanatism
LGS Calibrations
What LGS errors can be reduced?
Fixed by NIRC2.
Fixed by DM.
Fixed by telescope + AO.
Could be worse. Depends on STRAP. May need to
optimize.
Will be worse initially (need to lower gains because of
noise). Improve with optimizing subaperture gains (from
LBWFS) & better system matrix.
Balance with DM bandwidth error. Improve with laser beam
quality, optimal focus on Na layer & more power.
Fixed
Fixed by projector location
Fixed by atmosphere
Could be worse. Reduce by using LBWFS centroid offsets.
Improve with optimal LBWFS to FCS control. 0.17 mm error
produces a 0.016" blur.
Implement up-link tip/tilt. Monitor tip/tilt & periodically recenter with FSMs.
Depends on NGS magnitude. Trade off vs bandwidth - TT.
?
Note that our 1st light LGS milestone is for SR = 0.2
2nd LGS Milestone Definition
Proposed Criteria
•
LGS facility operable by AO experts (by end of Dec/03).
•
Performance Success Criteria:
1.
2.
6.
9.
•
Operability Success Criteria:
3.
4.
5.
7.
8.
•
Achieve a Strehl > 0.2 in Kp for a V > 15 mag NGS.
Achieve a Strehl > 0.1 in Kp for a V > 17 mag NGS.
Corrected images on science camera < 5 min after slew.
Nod time < 20 sec (including opening & closing loops).
LGS AO operable by 3 AO + 1 laser expert (+ NIRC2 operator).
All software tested & released in a controlled version (by Dec. 15)
Demonstrate correction over 50° < EL < 85°.
Off-axis science demonstrated for a target > 20 arcsec from NGS.
Nodding demonstrated over a 5x5” field.
Numbers indicate relative priorities.
• Faint performance higher priority than off-axis operation
2nd LGS Milestone Tasks
#
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Subsystem Priority
Task
Lead
Team Planned Actual
STRAP
1,2
Significantly reduce background
AB
PW
11/05/03
STRAP
1,2
Optimize to achieve 5(?) mas rms on V=17
EJ
MvD
STRAP
1,2
How do you eval STRAP perf on V>13?
MvD
STRAP
1,2
Fix diaphragm
JC
EJ
STRAP
1,2
Determine if Na rejection needed
EJ
MvD
STRAP
1,2
Implement background compensation offset
EJ
MvD
STRAP
3,6,9 Hardware integration into WFC
JC
EJ
STRAP
3,6,9 Software integration into WFC
EJ
11/17/03
STRAP
Decision on spares for STRAP
PLW
12/31/03
LBWFS
1,2
Significantly reduce background
DLM SH,AB,PW
LBWFS
3
Define next steps in auto & calib & proceed DLM SH,MvD
LBWFS
3
Automate LBWFS calibration
EJ
DLM,SH
LBWFS
6
Autoset integration time vs STRAP signal
DLM
SH
LBWFS
7,8
Realign &/or eliminate vignetting over 20x20" PW
AB
LBWFS
7,8
Maintain lenslet-DM registration over 20x20" DLM
EJ
TSS
6,7,8,9 Auto reposn up to 20" off-axis in < 10 sec
PS
10/07/03
WFS focus 1,2,5 Increase FCS range to >~250 mm
AC
10/07/03
WFS focus 1,2,6 Autozero LBWFS focus by adjusting Na alt
DS
10/11/03
Laser pting 1,2,6,9 Offload average WFS t/t to laser pointing
AB
DS
Laser pting
1,2
Determine how soon UTT needed
MvD
AB
11/20/03
Laser pting
6,7
M3 EPICS control from OBS
JC
SH
10/30/03
Laser pting
6
Autoposn M3 vs elevation
DS
11/17/03
Laser pting
6,7
Autoposn M3 up to 20" off-axis in <10 sec
DS
11/17/03
Laser pting
8,9
Autoposn laser pting for a 5x5" nod
DS
2nd LGS Milestone Tasks
#
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
Subsystem
Laser
Laser
Laser
Laser
Laser
Laser
Laser
Auto Optim
Auto Optim
Auto Optim
Obs Proced
Obs Proced
Obs Proced
Obs Proced
Obs Proced
Cleanup
Cleanup
Cleanup
Cleanup
Cleanup
Cleanup
Cleanup
Priority
1,2
1,2
1,2
1,2
1,2
3
3
1,2,3,6
1,2,6
1,2,6
3,6
3,6
3,6
3,6
3,6
4
4
4
4
4
4
4
Task
Lead
Document reln between PIB & pting
AB
Document reln between on-sky & PIB image AB
Document reln between power & WFS signal JC
Doc output power & image quality fluctuations JC
Improve image quality & output power
RL
Implement FM200
JC
Resolve cooling capacity problem
PW
Integrate SW to gen WFS cogs from LBWFS MvD
Implement gains as function of pupil position MvD
Overall DM gain
MvD
Review & update observing procedure
AB
Automate appropriate steps
AB
Document calibration procedures
DLM
Define AO expert roles & implement training AB
Define laser operation & implement training
RL
k2aoserver implementation
LC
Crate boot from k2aoserver
LC
Telemetry halts while writing diagnostics(v3.6) EJ
Implement local disk for WFC
EJ
Verify AO parameters are properly saved
DS
AO & laser SW releases
PS
Fix background make (v3.6)
EJ
Team
DS,RL
JC
AB,RL
RL
JC
Planned
Actual
10/07/03
JC
DLM
DLM
AB,EJ
DLM
JC
DLM
PS
10/10/03
10/10/03
10/10/03
all
10/10/03
2nd Light Run Summary
(Oct. 10&11)
 Cirrus/clouds for entire run. Managed to project laser
through holes for short periods

Inadequate time to demo good LGS AO correction
 Laser progress



Ran from summit control room (no laser access reqd)
Start of night alignment adequate for night
Much progress on understanding laser pointing
 LGS AO progress



Progress on punchlist items, especially focus correction
Some training with tools
No progress on STRAP limiting mag since background high
again (had been reduced prior to run)
 Good NGS science performed through cirrus
Other AO FY04 Milestones
NGS
1
2
3
4
5
6
FY Quarter
04Q1
04Q2
04Q2
04Q3
04Q3
04Q4
Description
AO characterization workshop
V2 ORR
Pre-OSIRIS tasks
Pre-nulling tasks
Handover to Operations
OHANA demonstration
Other
1
2
3
4
5
6
FY Quarter
?
04Q2
04Q3
04Q3
?
?
Description
Hire Contos replacement
K1 laser RFP distributed
K1 laser contract placed
KPAO error budget & point design(s)
Keck Foundation WFC upgrade?
AODP atmos characterization effort?
Actual
10/24/03
1/21/03
Actual
NGS AO Tasks
# NGS Mile #
Task
1
2
K1 AO enclosure cleanliness mods
2
2,5
Complete k2aoserver upgrade
3
2
Implement auto KAT-FSM offloading
4
2
Implement auto reuse of AO parameters
5
2,5
Document K1,K2 FSM range
6
3
Implement OSIRIS fold mirror on K2
7
3
Implement OSIRIS/NIRC2 calib lamps on K2
8
4
K1 image rotator recoating & realignment
9
4,5
K2 image rotator recoating & realignment
10
4
Implement chopping with tip/tilt mirror
11
5
Implement 1"/pixel WFS mode
12
5
Increase K2 FSM unvignetted range
13
5
Define requirements for K2 Ops handover
14
6
Implement OHANA fold mirror on K1
Lead
Team Planned Actual
Nance
11/30/03
LC
DLM
01/02/04
DLM
Booth
01/08/04
DLM
Booth
CN
JB
JB
JB
MdV,TS 12/12/03
JB
EJ
CN
MvD
DLM
DLM
JB
RG
JW
K2 AO Observing Calendar
Sept. None after 9/18.
Oct. 2-5 NIRC2; 10-11 LGS; 12-16 IF
Nov. 8-11 NIRC2; 14-16 IF; 17 LGS; 27-30 NIRC2
Dec. 5-8 NIRC2; 10 LGS; 11-13 NIRSPAO; 15-17 LGS;
16-18, 23-26, 29-31 NIRC2
 Jan. 5-8 IF; 5, 9-12, 27 NIRC2





Only ½ night on 1/27
 Appropriate gaps for significant AO changes:



15 wk days from Fri. 10/17 to Th. 11/6.
6 wk days from Tue. 11/18 to Tues. 11/25.
9 wk days from Tue. 1/13 to Fri. 1/23.
 Larger gaps available for laser changes.
AO 03B Calendar
Month Date Day Observing
Event
Oct
20
M
21
T
22 W
23 Th
24
F
AO characterization workshop
Nov
25
26
27
28
29
30
31
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Sa
Su
M
T
W
Th
F
Sa
Su
M
T
W
Th
F
Sa
Su
M
T
W
Th
F
Sa
Su
M
Tasks (10/16/03)
STRAP background work (PW,AB)
Rearrange WFC VME crate for STRAP & UTT (JC,EJ)
Rearrange WFC VME crate for STRAP & UTT (JC,EJ)
STRAP diaphragm repair (JC)
STRAP diaphragm repair (JC)
Refile with FAA (PS)
CfAO retreat
CfAO retreat
CfAO retreat
CfAO retreat
Distribute K1 laser reqments 1st draft (RL,JC,DS,PW)
Keck Foundation site visit
NIRC2
NIRC2
NIRC2
NIRC2
IF
IF
IF
LGS AO
AO 03B Calendar
Month Date
18
19
20
21
22
23
24
25
26
27
28
29
30
Dec
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Day Observing
Event
Tasks (10/16/03)
T
W
Th
F
Sa
Su
M
T
W
?
Th
F
NIRC2
Sa
NIRC2
Su
NIRC2
M
NIRC2
T
W
Th
AOWG LGS planning workshop
F
NIRC2
Dist K1 laser SOW & contract draft (RL,JC,PW,SS)
Sa
NIRC2
Su
NIRC2
M
NIRC2
K1 image rotator recoat/realign (JB,MdV,TS)
T
?
K1 image rotator recoat/realign (JB,MdV,TS)
W
K2 AO 1/2 LGS AO?
K1 image rotator recoat/realign (JB,MdV,TS)
Th NIRSPAO
K1 image rotator recoat/realign (JB,MdV,TS)
F NIRSPAO
K1 image rotator recoat/realign (JB,MdV,TS)
Sa NIRSPAO
Su
?
M LGS AO
T LGS AO
1st half LGS AO. 2nd half team Keck NGS?
W
NIRC2
1st half LGS AO. 2nd half LGS AO for team Keck?
AO 03B Calendar
Month Date
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Jan
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Day Observing
Th
NIRC2
F
Sa
Su
M
T
NIRC2
W
NIRC2
Th
NIRC2
F
NIRC2
Sa
Su
M
NIRC2
T
NIRC2
W
NIRC2
Th
F
Sa
Su
M IF/NIRC2
T
IF
W
IF
Th
IF
F
NIRC2
Sa
NIRC2
Su
NIRC2
M
NIRC2
T
W
Th
F
Event
Tasks (10/16/03)
Team Keck
Distribute K1 laser RFP (RL,JC,DS,PW)