Camera debrief Christopher Stubbs DM All-Hands meeting 12 February

1/3 RTM test O’Connor, Kuczewski, Juramy, Haupt 2/6/2015 2

Setup 3 CCD250 prototype sensors on CeSiC raft baseplate One REB2 + DREB1 in vertical slice (TS7) cryostat – 6X ASPIC3 – 6X CABAC0 REC mockup read_ccd_480kHz.ssf sequencer file: – 480kpix/s, no serials during exposure, fast clear once on startup Clock and bias settings: – OD/RD/GD 28/18/28 – Clocks +10/0, RG Setpoints: – RSA -100C – coldplate -10C 3

Flatfields ~170kADU 4

Image 5

PTC with polyfit(2) mean of sum image ADU Var of diff image ADU 2 Note: ½ of channels have different gain setting resistors populated on REB 6

Gains Black – chipA Red – chipB Green - chipC Black – top Red – bot 7 AB C Note: CCD B has lower sensitivity than A or C due to AR coating difference (see slide 8) Note: ½ of channels have different gain setting resistors populated on REB

480kpix/s gain 8

9 CCD C CCD B CCD A

480kpix/s noise Black – chipA Red – chipB Green - chipC 10 channel

Mean vs. exptime 11 Linearity Note: ½ of channels have different gain setting resistors populated on REB CCD A one ASPIC gain setting is 2X

“Sampling scope” diagnostic mode Using normal video channel ADCs, can measure repetitive waveforms by delaying the timing of the convert pulse on successive pixel cycles. LPNHE-provided firmware performs this automatically Can set ASPIC into “transparent “ mode to visualize CCD OS waveform Equivalent to an 18-bit, 100MHz sampling oscilloscope 12 voltage  reset feedthru reset level video level ramp down ramp up ASPIC reset

Notes REB-to-REC mounting is overconstrained – Many REB solderjoint problems REB temperatures in ASPIC/CABAC/ADC region ≈T coldplate + 20C; DREB temperature ≈ 20C warmer than REB To do: – Install x-ray sources – REB temperature study – Optimize timing at 550kpix/s using sampling scope mode – Measure crosstalk matrix – Exercise: CCD RTD temperature sensor Heater control Diagnostic ADC – Proceed to Phase 5 (full RTM) 13

stageon-projectoff-projectcoord & sign-off anomaly identificationsensor team SAWGcamera scientist SAWG lead characterization & parameterization DESC labsSAWG lead implementation in phosim phosim team validation of simulations DESC, SAWGSAWG lead, PST, TC compensation algorithm – image and/or catalog level DMDESC WG’s, other LSST WG’s PST, science teams compensation alg. assessment & validation DM, PSTDESC WG’sPST, science teams quantify residuals and systematic error DM, PSTDESC WG’sPST, science teams Wednesday Tuesday

BACKUP 15

Gain and noise comparison Black – POC Blue - JK 16

ratios 17

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