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 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
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