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WFC3 IR Detector Status

Presentation to the Space Telescope User Committee
April 20, 2006 Massimo Robberto

"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." January 6, 2006 WFC3 Scientific Oversight Committee Meeting

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Historic recap
· FPA #64 has been installed in flight build Nr. 2.
­ Successfully passed Fall 2004 Thermal Vacuum campaign ­ ready to flight

·

The WFC3 project has discovered radiation induced glow from high energy particles on CdZnTe substrates
­ increase of background may reduce sensitivity

·

Solution: remove CdZnTe substrate (thinning)
­ Eliminates radiation induced glow ­ Possible increase of QE at shorter wavelengths ­ Visible window open down to 0.4micron
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." January 6, 2006 WFC3 Scientific Oversight Committee Meeting 2


New Lot Growth at RSC
In Fall 2005 Rockwell has fabricated two new lots of detectors for WFC3, with substrate removed. Radiation tests have confirmed that removal of the CdZnTe substrate eliminates the radiation induced background Substrate removal has resulted in improved quantum efficiency over earlier devices. Sensitivity is extended into the visible wavelength range.
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." January 6, 2006 WFC3 Scientific Oversight Committee Meeting 3


QE For Flight Candidates
QE o f N e w W F C 3 D evi ces
100 90 80 70 60 50 40 Cur r ent Fl i ght 30 20 10 0 200 400 600 800 1000 1200 1400 1600 1800 WFC3 IR Channel Range

W a v e l e ng th (nm)
FPA6 4 FP A 117 FPA1 1 8 FPA1 2 1 FPA1 2 2

"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." January 6, 2006 WFC3 Scientific Oversight Committee Meeting

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Dark Current

"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." January 6, 2006 WFC3 Scientific Oversight Committee Meeting

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Cumulative Mean Dark Rates

"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." January 6, 2006 WFC3 Scientific Oversight Committee Meeting

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Performance Metrics For Flight Candidate Devices
Discovery Efficiency relative to FPA64 Point sources - Average zodi - 2400s
4.00 F11 F16 F12 F09 0W 0W 6N 8M

3.50

3.00

2.50

2.00

1.50

1.00

0.50

0.00
FP A6 4+ 1.0e/s FP A6 4+ 0.25e/s FP A1 17 FP A1 18 FP A1 21 FPA 104 FP A1 05 FP A1 16 FP A1 13 FPA 12 2 FPA 10 2 FPA 64 IC3/A N C S

"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." January 6, 2006 WFC3 Scientific Oversight Committee Meeting

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More new Detectors
· RSC is producing eight more devices from the Lot 1 and 2 residual assets and from the recently completed lot 3. These detectors are Thinned, new BCS design, correct torque. delivered to the project: FPA 128, FPA 129
"Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." January 6, 2006 WFC3 Scientific Oversight Committee Meeting

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