4x8 Mosaic Camera Development Developed a flight-like prototype of a large mosaic NIR and visible focal plane instrument suitable for use in any (including the most ambitious) of the dark energy mission variants. Demonstrate interoperability of multiple NIR and CCDs. Look for crosstalk – understand grounding and cabling. Achieving nominal read noise performance with no measurable crosstalk.

Up the ramp (UTR) measurements of NIR 1.95 µm cutoff detector (#16071) Test Results Noise CCDs < 4 e-; NIR (1.7µm cutoff) < 7e- Fowler 16 NIR (1.95µm cutoff) 400 second UTR total noise < 0.03e-/sec Interoperability/Crosstalk No interference or crosstalk measured QE (CCD > 90% peak; NIR > 85% peak) Flatness At room temperature (detectors < ±5 µm, cold plate < ±1 µm) At operating temperature (still being analyzed, but looks good) Up the ramp (UTR) measurements of NIR 1.95 µm cutoff detector (#16071) Total Noise Vs. Integration Time 400 second dark current image 0.036 e-/sec, 8.1 e- total noise

4x8 Focal Plane in Testing 8 NIR & 8 CCD detectors installed (detector side) 8 NIR & 8 CCD detectors installed (electronics side) Thermal/Functional testing Vibration test

CCD and NIR Detectors and Electronics 32-channel NIR detector readout module with TIS SIDECAR® ASIC developed at SLAC HgCdTe NIR detector hybridized and mounted on LBNL/UofM developed, 4 side abuttable SiC pedestal. CRIC-CLIC ASIC CCD electronics module developed at LBNL. CCD detector mounted on LBNL/Yale developed, 4 side abuttable SiC pedestal.

CCD Packaging Fixture Chuck temperature controller Macro lens camera on glue dispensing side Macro lens camera away from glue dispensing side Substrate chuck Epoxy dispensing syringe stage Epoxy-dispensing unit CCD chuck 4x Fiber optic lights Telecentric lens cameras for setting gaps, both sides

CCD Bonding Top of Substrate Bevel on substrate CCD CCD chuck Dispensing between wirebond pads (syringe tip outside diameter is 0.52mm) Substrate Glue (70um gap) CCD Telecentric view of non-wirebond edge when epoxy first appears there

Detector Flatness Testing 2x Keyence distance-measurement devices (obscured) 3x 15.240mm thick ceramic gauge blocks Reference flat CCD on 2mm spacers Polymeric pad (since replaced with electrically grounded pad) Y-stage X-stage Granite block

Detector Flatness CCD S/N 054 NIR S/N 010 2.2 µm P-P, 0.3 µm RMS

CCD #34 Measurements in 4x4 array Bias Image Gain measured using photon transfer Gain is 0.65 e-/ADU Read noise it 3.65 e- Illuminated Image

NIR 16071 Measurements in 4x4 array Gain Image 1.95 µm cutoff Gain measured using photon transfer 50 time series fowler-1 images Gain is 2.6 e-/ADU Fowler-1 noise is 18.3 e- Fowler-1 Noise Image

Full 4x8 Flatness Measurement (135 K) Preliminary results show SiC coldplate well within specification