NICMOS SMOV Update
October 21 2009
Agenda
1. Recent & Upcoming Activities
2. NICMOS SMOV Program Status
3. Recent Results and Analysis
- Dark Monitoring
- Focus Tilt measurement
1
Recent Activity:
• 11947 Daily dark monitoring (after Oct 19 dark monitoring via 11417)
• 11408:3 281:11:17 PAM Tilt measurements NIC1/NIC2/NIC3 (Thu Oct 8)
• 11410 292:14:08 Aperture Location NIC1/NIC2/NIC3 (Mon Oct 19)
• 11416 Thermal Background started Mon Oct 19
• 11417 Dark Monitoring and Detector Reaqd Noise started Mon Oct 19
Planned activities:
— 11408:4 Update of nominal PAM Tilt settings visit 8 (TBD)
— SIAF update (if needed) following analysis of 11410 (A. Koekemoer)
— 11416 Thermal Background. Parallel observations to continue until ‘sufficient’
number of visits have been obtained (≤100)
— 11417 Dark Monitoring and Detector Read Noise continue until regular cal starts
2
NICMOS SMOV Status
Activity
Prop ID
Title
PI
Visits
Done
Total
Visits
Status
NIC03
11406
DC Transfer Test
Schneider
2
2
Completed
NIC04
11407
Filter Wheel Test
Wheeler
4
4
Completed
NIC05
11408
Focus/Tilt Test
Wiklind
7
8
Analysis in
progress (tilt)
NIC06
11409
FOM Functional
Dahlen
0
1
Deferred
NIC07
11410
Aperture Location
Koekemoer
3
3
Analysis in
progress
NIC08
11411
Optical Plate Scale
Wiklind
0
3
Deferred
NIC09
11412
Geometric Stability
Wiklind
0
2
Deferred
NIC10
11413
Mode-2 Coronagr. Target Acquisition
Schneider
0
(5)*
On Hold
NIC11
11414
Optimum Coronagraphic Focus
Schneider
0
(2)
On Hold
NIC12
11415
Coronagr. Performance Assessment
Schneider
0
(5)*
On Hold
NIC13
11416
Thermal Characterization
Barker
3
(100)
In progress
NIC14
11417
Detector Read Noise and Dark Current
Dahlen
14
86
In progress
New
11947
Dark Monitoring (C17 Cal Program)
Dahlen
48
48
Completed
*) Number of orbits changed
3
Recent Results
4
Recent Results
Linear Dark Current [e-/s]
NCS Set Point
Camera
72.4
Ratio
75K
Ratio
76K
Ratio
77K
Ratio
NIC1
0.09 ± 0.02
1.0
0.14 ± 0.02
1.6 ± 0.4
0.15 ± 0.02
1.7 ± 0.4
0.18 ± 0.02
2.0 ± 0.5
NIC2
0.08 ± 0.02
1.0
0.12 ± 0.02
1.6 ± 0.5
0.14 ± 0.02
1.8 ± 0.5
0.16 ± 0.02
2.1 ± 0.6
NIC3
0.13 ± 0.03
1.0
0.35 ± 0.03
2.7 ± 0.7
0.50 ± 0.03
3.9 ± 1.0
0.67 ± 0.03
5.2 ± 1.3
5
Recent Results
Distribution of dark current (total) for the difference
image (75 – 72.4, 76 – 72.4 & 75 – 72.4).
NIC1 & NIC2:
@ 76K: mainly an increase in the high current tail.
@ 77K: An overall shift of the dark current to higher
levels, plus an increased tail.
NIC3:
@ 76K: marked increase in the high current tail and a
slight shift in the overall level
@ 77K: increased tail and overall shift towards higher
dark current.
6
Recent Results
NIC1
NIC2
NIC3
75K
15.8%
76K
27.7%
77K
31.9%
75K
15.8%
76K
24.5%
77K
31.3%
75K
15.8%
76K
36.5%
77K
42.2%
Quantifying the warm dark current tail:
Fraction of pixels above a dark current
level (total) corresponding to a distance
from the peak that is 1σ of the average
(75-72.4)K peak.
7
!
Recent Results
Optimal PAM Tilt
Two methods used in analyzing the data:
Airy Ring Asymmetry (Arizona)
Phase Retrieval (STScI)
Fit PSF with Zernike polynomial for N stars ==>
(Xcoma,Ycoma)
2
2
Total coma = x coma
+ y coma
Bicubic spline interpolation for the nine inner
points
Find the minimum total coma
8
Recent Results
Glenn Schneider:
Airy Ring Asymmetry
• Average of 7 stars
• Flux normalized
• Smooth
• Measure intensity in 4
quadrants
• Asymmetry coefficient Ax,Ay
• Linear interpolation to find
minimum asymmetry
NIC1
(XTILT,YTILT) = (-1.1,+1.0)
9
Recent Results
Glenn Schneider:
Airy Ring Asymmetry
• Average of 7 stars
• Flux normalized
• Smooth
• Measure intensity in 4
quadrants
• Asymmetry coefficient Ax,Ay
• Linear interpolation to find
minimum asymmetry
NIC2
(XTILT,YTILT) = (-2.1,+3.6)
10
Recent Results
(XTILT, YTILT) = (0.0,+1.0)
(XTILT, YTILT) = (0.0,+1.5)
(XTILT,YTILT) = (-1.1,+1.0)
(XTILT,YTILT) = (-2.1,+3.6)
11
Recent Results
(XTILT, YTILT) = (-1.0,+1.0)
(XTILT, YTILT) = (0.0,+1.5)
12
History of optimal PAM Tilt
NIC1
XTILT
NIC2
YTILT
XTILT
YTILT
SMOV2
7
12
5
10
SMOV3b
16
14
15
10
SMOV4 (suggested values)
16
14
14
12
Suggested Forward Plan
Leave NIC1 PAM unchanged
Correct NIC2 PAM with (XTILT,YTILT) = (-1.0, +2.0)
13
14
Supporting documentation
15