Download - TIPS meeting – Feb 21, 2002
February 21, 2002 TIPS meeting 1
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
TIPS meeting – Feb 21, 2002
UVIS CCD IR FPA / Mux
WFC3 Status (detectors)M. Robberto
February 21, 2002 TIPS meeting 2
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
CCD Status
• Marconi has completed all deliveries.– Original order of 6 devices.
• One (# 23) damaged back in Nov 01 and returned to Marconi for analysis
• Four (# 18 & # 178 and # 37 & # 40) selected for flight and characterized.
• One held in reserve.
– Supplemental order of 2 devices.• Both (# 48 and #50) received, characterization of #38 underway in the
DCL.
– Closeout meeting held on 15 January 2002.
– Last detectors #37, #40, #50 shipped at Ball next week
• These are exceptional devices, with extremely uniform behavior from device to device.
February 21, 2002 TIPS meeting 3
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
WFC3 CCD Innovations
• Low readout noise.– Improves narrow-band and UV imaging sensitivity and enables shorter
sub-exposures in a long integration (providing more redundant images or more thorough drizzling).
– Will challenge the instrument electronics.
• High near-UV QE.– Major WFC3 scientific thrust is enabled.
• Extremely uniform detector spatial response.– Simplifies calibration and improves photometric accuracy.
• Charge injection for CTE degradation mitigation.– Slows down effective device aging.
• Fringing characterization and prediction for long wavelength observations.– Improves accuracy of narrow-band and narrow-line observations.
February 21, 2002 TIPS meeting 4
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Marconi CCDs HaveVery Low & Consistent Readout Noise
Marc. DCL Marc. DCL Marc. DCL Marc. DCL Marc. DCL Marc. DCL
RN (A) e- 3 1.6 2.9 2.6 3 1.7 3.2 2.4 3.5 3.3
(B) e-3 1.7 1.8 2.6 2.9 1.6 3 1.6 3.5 3.6
Spec#165 #166#188 #152 #189
Units#187
Marc. DCL Marc. DCL Marc. DCL Marc. DCL Marc. DCL Marc. DCL Marc. DCL
RN (A) e- 3 3 3 2.2 3.1 <2.7 2.9 2.8 3.4 2.1 3.1
(B) e-3 3.5 3 2.3 3.1 <2.7 3 3.5 3.1 2.2 3.1
#040 #050Units Spec
#136 #178 #018 #023 #037
Read Noise For Marconi CCD43 Engineering Grade Devices
Read Noise For Marconi Flight Candidate Devices
By comparison, the SITe devices in the ACS instrument have read noises in the range 4.5-5.5 e-
Flight pair number 1 --- Flight pair number 2 candidates ---
February 21, 2002 TIPS meeting 5
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Marconi CCDs Exceed Expectations for High UV QE
Pair Number 1 flight CCDs versus the Specification
February 21, 2002 TIPS meeting 6
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
IR-FPA Status
In addition, MUX #10 was delivered to Ball and is being integrated into the surrogate IR detector build
Detector# Produced Due Delivered Test report
11 13-Mar-01 9-Apr-01 27-Apr-01 26-Mar-01 pixel crosstalk14 30-Mar-01 23-Apr-01 27-Apr-01 10-May-01 pixel crosstalk15 18-Apr-01 23-Apr-01 16-May-01 30-May-01 QE non-uniformity at cutoff18 20-Apr-01 4-Jun-01 8-Jun-01 11-Jul-01 at Ball, integrated into qual unit20 20-May-01 4-Jun-01 8-Jun-01 18-Jul-0121 25-May-01 4-Jun-01 8-Jun-01 20-Jul-0122 13-Jun-01 6-Jul-01 18-Jul-01 1-Sep-0124 14-Jun-01 6-Jul-01 18-Jul-01 1-Sep-0125 6-Jul-01 6-Jul-01 18-Jul-01 1-Sep-01 warm image shows unbonded pixels27 19-Jul-01 3-Aug-01 7-Sep-01 15-Oct-01 Flight backup candidate30 1-Aug-01 3-Aug-01 7-Sep-01 8-Nov-01 Flight backup candidate31 23-Aug-01 3-Aug-01 12-Oct-01 1-Oct-01 Flight candidate32 4-Oct-01 4-Oct-01 26-Oct-01 8-Nov-0133 13-Sep-01 4-Oct-01 12-Oct-01 9-Nov-01 Flight candidate34 14-Oct-01 4-Oct-01 26-Oct-01 9-Nov-01
MILESTONESComments
February 21, 2002 TIPS meeting 7
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Rockwell Test Results
Parameter Units 11 14 15 18 20 21 22 24
Gain e-/mV 361 300 321 315 274 315 315
Read noise e-/pix 65 40 47.2 47 39 43 47.5
Dark Current e-/pix/sec 0.5 0.6 0.049 0.34 0.37 0.104 0.388 0.357
Persistencee-/pix/sec
after 96 min 0.165 1.42 0.504
QE @ J % 72.7 27.9 24 20.6 42.7 32 45.2 47.1
QE @ 1.5 m % 86.1 31.2 27.1 33.8 64.6 44.4 58.8 50
Operability % >99 >97 >99 >99 >97 >97 >99.7 >99.1
Full Well ke->90 >85 >102 >100
FPA #
Parameter Units 25 27 30 31 32 33 34
Gain e-/mV 308 499 350 347 300 332 360
Read noise e-/pix 68.8 57.7 44.7 33.9 48.1 42.1
Dark Current e-/pix/sec 0.153 0.136 0.133 0.037 0.086 0.129 0.041
Persistencee-/pix/sec
after 96 min 0.499 0.207 0.43 0.067 0.083 0.125 0.055
QE @ J % 50.6 39 43.8 61.3 25.4 55.1 28.4
QE @ 1.5 m % 68.2 53.6 55.9 81.1 39.3 76 38.9
Operability % >99.2 >99.7 >99.8 >99.7 >99.7 >99.7 >99.6
Full Well ke->104 >150 >110 >100 >110 >100 >132
FPA #
February 21, 2002 TIPS meeting 8
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
RSC Dark Current and QE Results
The dark current and QE performance of the detectors showed dramatic improvement over the course of the program
min
100%
100%min
February 21, 2002 TIPS meeting 9
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Dark current
y = 3E-17e0.2313x
0.0001
0.001
0.01
0.1
1
135 140 145 150 155 160 165
Temperature (K)
dark
cu
rren
t (e/
s)
FPA15:DC= 0.04e/s @ 150K
0.01
0.1
1
10
135 140 145 150 155 160 165
temperature (K)
dark
cur
rent
(e/s
)
0.01
0.1
1
10
144 146 148 150 152 154 156
temperature (K)
dark
cur
rent
(e/s
)
FPA22:DC= 0.39e/s @ 150K
FPA18:DC= 0.34e/s @ 150K
February 21, 2002 TIPS meeting 10
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
FPA310 7200s Exposure Dark Current vs Read Number
d07_150k_dk_00XX.fits
53000
54000
55000
56000
57000
58000
59000
1 3 5 7 9 11 13 15 17
Read Number
Mea
n S
ci P
ix (
DN
)
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
18
20
22
24
C. Hanley 11 Jan 2002
FPA31 dark current ramps
• Ramp slope decreases with time• Second read decreases with time
FPA31 10800s exposure
February 21, 2002 TIPS meeting 11
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
FPA31 M ean Signal in Last Read vs Time
53000
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55000
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0 50000 100000 150000 200000 250000
Time (seconds)
Me
an
Sc
i Pix
(D
N)
1day 2days
FPA31 dark current settling time
Cycle power
A sequence of 20 ramps 3 hr long, each with 1+16 samples (one every 675s)
February 21, 2002 TIPS meeting 12
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
FPA31 Dark Current Over Time
-0.8
-0.7
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0 50000 100000 150000 200000 250000
Time (seconds)
Dar
k C
urre
nt (e
-/s)
FPA31 dark current settles after ~ 2 days
Cycle power
1day 2days
FPA31 dark current settling time
{CEIS
February 21, 2002 TIPS meeting 13
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
FPA31 dark anomaly
November 01 data
FPA31 appears to have two populations of pixels, each with their own dark current behavior.
February 21, 2002 TIPS meeting 14
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
FPA31 dark – 2 populations
October 24 data
1hr 1hr
1hr
February 21, 2002 TIPS meeting 15
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Dark current summary
• FPA31 dark current is ~0.05e/s/pix, once the FPA is set.• Settling time is ~36 hr.• For the first ~36 hr the dark current is dominated by a
large drift in the output signal. • Irregular behavior still present after 36 hr on short ramps.• The drift is similar to the “reset anomaly”, but it has larger
time-scale and is related to the FPA power cycling. Reset anomaly can be corrected.
• Power cycling of IR FPA is not expected to routinely occur on WFC3.
February 21, 2002 TIPS meeting 16
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Quantum efficiency
FPA31
January 11 data
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
500 700 900 1100 1300 1500 1700 1900
Q1
Q2
Q4
Q3
OK
$
$$
February 21, 2002 TIPS meeting 17
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Readout noise
inboard
8
10
12
elec
tron
s
active area
SB Jan 16,2001
30
32
34
elec
tron
s
36
February 21, 2002 TIPS meeting 18
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Readout noise
• FPA#15: 32 e/pix/read • FPA#18: 30 e/pix/read• FPA#22: 30 e/pix/read• FPA#25: 28 e/pix/read• FPA#31: 31 e/pix/read
Summary of the RON measured on active pixels
February 21, 2002 TIPS meeting 19
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Reference pixels
4507 horizontal
1507 horizontal
1507 vertical
1014 5 reference pixels
1014 1014 active pixels
4507 vertical
February 21, 2002 TIPS meeting 20
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Fixing reference pixels
0
5
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50
0 6 12 18 24 30
Fowler DCS
adu Horizontal
Vertical
0ms 1ms 2ms 3ms 8ms
Vertical reference pixels are “light sensitive”Adding a delay time at the beginning of each line read eliminates the effect
February 21, 2002 TIPS meeting 21
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
Reference pixels drift in 60hr
45000
47000
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59000
0 50 100 150 200 250 300
sample
cou
nts
dark
vertical
horizontal
45900
45950
46000
46050
46100
46150
46200
0 50 100 150 200 250 300
sample
cou
nts
horizontal
vertical
Reference pixels are stable within ~100eover a time-scale of ~2.5 days
February 21, 2002 TIPS meeting 22
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
CONCLUSIONS
FPA 31 has been deeply investigated• QE above Performance Specs at m OK
below Minimum Specs at m NO
• Dark Current meets specs by a factor ~4, but– Needs ~ 36hr to settle ??– Irregular behavior common for short exposure times NO
• RON ~30 electrons/read NO
• Linearity and well depth OK
• Amplifier glow OK
• Cosmetic OK
• Reference pixels OK
February 21, 2002 TIPS meeting 23
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure."
• One between FPA#31 or FPA#33 to be delivered next week
• Rockwell has produced two extra non-flight parts, FPA#35, #36 currently under test. Preliminary data confirm QE and RON measured at DCL.
• Rockwell has delivered to UH (D. Hall) a detector with 5m material and HI-1R MUX for RON test.
• Rockwell has agreed to grow LOT 5. Expected 6-8 weeks for PECs/test device data and 4 months for flight parts.
• Contractual issues worked on.• New plan for 2nd detector build under discussion with
BALL.