Chip 1 #17 SiPM Temperature Dependence: Module 8

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IntroductionThe SiPM response depends on the temperature and operating voltage  gain change: dG/dT ~ -1.7%/K, dG/dV ~ 2.5%/0.1V For light yield of the tile at fixed LED light intensity, the T & U dependences become: dQ/dT ~ -4.5%/K, dQ/dV ~ 7%/0.1V Thus, we installed an LED based monitoring system Monitor stability of tile-fiber-SiPM system between MIP calibrations with fixed LED intensities Perform gain calibration Measure SiPM response function Determine intercalibration constants We have started to study the SiPM response in different cells using beam test data to determine correction factors to evaluate what measurements are required to achieve a stable system (< 1%)

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Calibration-Monitoring SystemProvide UV light to each tile via clear fiber Monitor each LED with PIN diode Record temperature & voltage with slow control system (5 temperature sensors/module)clear fiberLED fiber couplingbundle of 19 fibers 18  tiles, 1  PIN diode

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Temperature Sensors in Module Look at tiles close to temperature sensors We started to look at tiles near a sensor ( )temperature sensorsCMB sideReadout side2-95-90-2

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PIN Diode Response in Module 8 PIN diode response for 7 runs between Oct 12 & Oct 21 black: Run 300462 (Oct 12) red: Run 300521 (Oct 13) green: Run 300541 (Oct 14) blue: Run 300548 (Oct 15) yellow: Run 300622 (Oct 19) magenta: Run 300682 (Oct 20) cyan: Run 300701 (Oct 21) PIN vs Vcalib shows 2 slopes, breakpoint at ~55k Runs before & after Oct 15 show different slopes (temp effect in PIN?)Chip 0, #2

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SiPM Response vs Vcalib in Module 8 SiPM response for 7 runs between Oct 12 & Oct 21 black: Run 300462 (Oct 12) red: Run 300521 (Oct 13) green: Run 300541 (Oct 14) blue: Run 300548 (Oct 15) yellow: Run 300622 (Oct 19) magenta: Run 300682 (Oct 20) cyan: Run 300701 (Oct 21) SiPM response curves differ for individual runs (temperature effect) Largest effects between Oct 12, Oct 13 and remaining runs Temperature decreased due to installation of fans Chip 0, #2

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Temperature Measurements For runs before October 18, temperature was 3-60 C higher module 15: 4 module 9: 7 module 8: 9curve

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SiPM Response vs PIN in Module 8 SiPM response for 7 runs between Oct 12 & Oct 21 black: Run 300462 (Oct 12) red: Run 300521 (Oct 13) green: Run 300541 (Oct 14) blue: Run 300548 (Oct 15) yellow: Run 300622 (Oct 19) magenta: Run 300682 (Oct 20) cyan: Run 300701 (Oct 21) SiPM plateau increases systematically with time from ~ 18k ADC bins to 24k ADC bins This is dominated by temperature changesChip 0, #2

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PIN Diode Response in Module 8 PIN diode response for 7 runs between Oct 12 & Oct 21 black: Run 300462 (Oct 12) red: Run 300521 (Oct 13) green: Run 300541 (Oct 14) blue: Run 300548 (Oct 15) yellow: Run 300622 (Oct 19) magenta: Run 300682 (Oct 20) cyan: Run 300701 (Oct 21) PIN vs Vcalib runs into ADC saturation at Vcalib =55k Data can be parameterized by one slope, however, slope differs for the 7 runs, becomes steeper with time (temperature?)Chip 2, #9

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SiPM Response vs Vcalib in Module 8 SiPM response for 7 runs between Oct 12 & Oct 21 black: Run 300462 (Oct 12) red: Run 300521 (Oct 13) green: Run 300541 (Oct 14) blue: Run 300548 (Oct 15) yellow: Run 300622 (Oct 19) magenta: Run 300682 (Oct 20) cyan: Run 300701 (Oct 21) SiPM response curves differ for individual runs Largest effects between Oct 12, Oct 13 and remaining runs Chip 2, #9

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SiPM Response vs PIN in Module 8 Corrected SiPM response for 7 runs between Oct 12 & Oct 21 black: Run 300462 (Oct 12) red: Run 300521 (Oct 13) green: Run 300541 (Oct 14) blue: Run 300548 (Oct 15) yellow: Run 300622 (Oct 19) magenta: Run 300682 (Oct 20) cyan: Run 300701 (Oct 21) Each run reveals different shape due to different temperatureChip 2, #9

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SiPM Temperature Dependence: Module 8Chip 2 #9

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SiPM Response vs Vcalib in Module 8 Temperature corrected SiPM response for 7 runs Oct 12-21 black: Run 300462 (Oct 12) red: Run 300521 (Oct 13) green: Run 300541 (Oct 14) blue: Run 300548 (Oct 15) yellow: Run 300622 (Oct 19) magenta: Run 300682 (Oct 20) cyan: Run 300701 (Oct 21) Shapes fall into 2 groups, before and after Oct 14Chip 2, #9

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SiPM Response vs PIN in Module 8 T & PIN corrected SiPM response for 7 runs, Oct 12-21 black: Run 300462 (Oct 12) red: Run 300521 (Oct 13) green: Run 300541 (Oct 14) blue: Run 300548 (Oct 15) yellow: Run 300622 (Oct 19) magenta: Run 300682 (Oct 20) cyan: Run 300701 (Oct 21) Runs from Oct 14 and later show same shape 2 runs before Oct 14 have lower response and differ from each other Chip 2, #9

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PIN Diode Response in Module 5 PIN diode response for 7 runs between Oct 12 & Oct 21 black: Run 300462 (Oct 12) red: Run 300521 (Oct 13) green: Run 300541 (Oct 14) blue: Run 300548 (Oct 15) yellow: Run 300622 (Oct 19) magenta: Run 300682 (Oct 20) cyan: Run 300701 (Oct 21) Chip 5, #9PIN vs Vcalib shows 2 slopes, breakpoint at ~55k Again dependence varies for runs before & after Oct 15

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SiPM Response vs Vcalib in Module 5 SiPM response for 7 runs between Oct 12 & Oct 21 black: Run 300462 (Oct 12) red: Run 300521 (Oct 13) green: Run 300541 (Oct 14) blue: Run 300548 (Oct 15) yellow: Run 300622 (Oct 19) magenta: Run 300682 (Oct 20) cyan: Run 300701 (Oct 21) SiPM signal runs into ADC saturation for Vcalib>58k for runs after Oct 13  temperature effect SiPM signals are rather broad Curves differ for the 7 runs, plateau increases for later runsChip 5, #9

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Pulse Height Distributions Look at PIN diode and SiPM pulse height distribution in module 8 chip 5 #9 for Vcalib=59500 PIN diode distribution is rather broad, rms =355 ADC bins SiPM distribution is a bit narrower, rms=215 ADC bins

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SiPM Response vs PIN in Module 5 PIN corrected SiPM response for 7 runs between Oct 12 & Oct 21 black: Run 300462 (Oct 12) red: Run 300521 (Oct 13) green: Run 300541 (Oct 14) blue: Run 300548 (Oct 15) yellow: Run 300622 (Oct 19) magenta: Run 300682 (Oct 20) cyan: Run 300701 (Oct 21) ADC saturation is visible for runs after Oct 13Chip 5, #9

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SiPM Temperature Dependence: Module 15Chip 5 #9 We looked at 10 channels so far

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Temperature Measurements Observe offset between pedestals for runs at low temperatures and runs at high temperatures  this is probably caused by change of conditions after Oct 18 The slopes for runs before Oct 18 (high temperature) and after Oct 18 look differently (due to modification of conditions) Two low points at high temperature (present in each channel) are flawed and should be omitted

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Conclusion and OutlookThe SiPM response functions taken at the beginning of each run provide a useful diagnostic tool in the test beam analysis The data need to be corrected for temperature effects  corrections factors are derived from measurements of sensors The correction will be tested with the SiPM response function  After corrections for temperature and PIN diode effects the SiPM response function of different runs should be identical This will allow us to refine the procedure and compare the response function of different SiPMs From this exercise we will learn what measurements are crucial for the ILC calorimeter We have just started this effort (plots for 4 channels) and need to do it for all channels

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Conclusion and Outlook Trygve has determined the pedestal-subtracted mean values for all SiPM channels and PIN diodes in the Vcalib runs We also need to understand the shapes of the individual distributions that enter the SiPM response curves For future beam tests the LED intensity needs to be tuned to avoid ADC saturation effects

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Backup Slides

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PIN Diode Response in Module 8 PIN diode response for 7 runs between Oct 12 & Oct 21 black: Run 300462 (Oct 12) red: Run 300521 (Oct 13) green: Run 300541 (Oct 14) blue: Run 300548 (Oct 15) yellow: Run 300622 (Oct 19) magenta: Run 300682 (Oct 20) cyan: Run 300701 (Oct 21) PIN vs Vcalib shows 2 slopes, breakpoint at ~55 Runs before & after Oct 15 show additional offset for slope for Vcalib> 55 Chip 5, #9

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SiPM Response vs Vcalib in Module 8 SiPM response for 7 runs between Oct 12 & Oct 21 black: Run 300462 (Oct 12) red: Run 300521 (Oct 13) green: Run 300541 (Oct 14) blue: Run 300548 (Oct 15) yellow: Run 300622 (Oct 19) magenta: Run 300682 (Oct 20) cyan: Run 300701 (Oct 21) No ADC saturation seen Curves look similar as those for chip 2 #9 Chip 5, #9

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SiPM Response vs PIN in Module 8 Compare PIN diode response for 7 runs between Oct 12 & Oct 21 black: Run 300462 (Oct 12) red: Run 300521 (Oct 13) green: Run 300541 (Oct 14) blue: Run 300548 (Oct 15) cyan: Run 300701 (Oct 21) Two sets of curves before Oct 14, after Oct 14 (temperature effects) Chip 5, #9

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Last Updated: 8th March 2018

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