February 21, 2002TIPS meeting1 "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." TIPS meeting – Feb 21, 2002 UVIS CCDIR FPA / Mux WFC3 Status (detectors) M. Robberto

February 21, 2002TIPS meeting2 "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 –Last detectors #37, #40, #50 shipped at Ball next week These are exceptional devices, with extremely uniform behavior from device to device.

February 21, 2002TIPS meeting3 "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, 2002TIPS meeting4 "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." Marconi CCDs Have Very Low & Consistent Readout Noise 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 e - Flight pair number 1--- Flight pair number 2 candidates ---

February 21, 2002TIPS meeting5 "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, 2002TIPS meeting6 "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

February 21, 2002TIPS meeting7 "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." Rockwell Test Results

February 21, 2002TIPS meeting8 "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% min

February 21, 2002TIPS meeting9 "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." Dark current FPA15: DC= 150K FPA22: DC= 150K FPA18: DC= 150K

February 21, 2002TIPS meeting10 "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." C. Hanley 11 Jan 2002 FPA31 dark current ramps Ramp slope decreases with time Second read decreases with time FPA s exposure

February 21, 2002TIPS meeting11 "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." 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, 2002TIPS meeting12 "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." FPA31 dark current settles after ~ 2 days Cycle power 1day2days FPA31 dark current settling time { CEIS

February 21, 2002TIPS meeting13 "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, 2002TIPS meeting14 "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

February 21, 2002TIPS meeting15 "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, 2002TIPS meeting16 "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." Quantum efficiency FPA31 January 11 data

February 21, 2002TIPS meeting17 "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." Readout noise inboard electrons active area SB Jan 16, electrons 36

February 21, 2002TIPS meeting18 "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, 2002TIPS meeting19 "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." Reference pixels 4  507 horizontal 1  507 horizontal 1  507 vertical 1014  5 reference pixels 1014  1014 active pixels 4  507 vertical

February 21, 2002TIPS meeting20 "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." Fixing reference pixels Vertical reference pixels are “light sensitive” Adding a delay time at the beginning of each line read eliminates the effect

February 21, 2002TIPS meeting21 "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." Reference pixels drift in 60hr Reference pixels are stable within ~100e over a time-scale of ~2.5 days

February 21, 2002TIPS meeting22 "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, 2002TIPS meeting23 "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 5  m 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 2 nd detector build under discussion with BALL.