Strontium-90 Teststand Update Strontium-90 Teststand Update I I st st P P hysics Institute B, RWTH Aachen University hysics Institute B, RWTH Aachen University 02/12/15 02/12/15
Strontium-90 Teststand UpdateStrontium-90 Teststand Update
IIstst P Physics Institute B, RWTH Aachen Universityhysics Institute B, RWTH Aachen University
02/12/1502/12/15
Strontium-90 Teststand UpdateStrontium-90 Teststand Update 22//8802/12/1502/12/15
9090Sr Teststand SetupSr Teststand Setup9090Sr Teststand SetupSr Teststand Setup
90Sr sourceon moveable tray
trigger scintillatorand PMT
four SiPM arrayson translation stage
light injection
additional trigger slotsfor horizontal scan
Strontium-90 Teststand UpdateStrontium-90 Teststand Update 33//8802/12/1502/12/15
SiPM ArraysSiPM ArraysSiPM ArraysSiPM Arrays
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SiPM Array MountSiPM Array MountSiPM Array MountSiPM Array Mount
translation stage
fibre matendpiece
SiPM mountand readout
reproducibility of approachwill be tested
Strontium-90 Teststand UpdateStrontium-90 Teststand Update 55//8802/12/1502/12/15
Expriment StatusExpriment StatusExpriment StatusExpriment Status
● New setup assembled and SiPM arrays mountedNew setup assembled and SiPM arrays mounted
● Readout adjustedReadout adjusted
– TriggerTrigger
– Pre-event deadtime (2 µs)Pre-event deadtime (2 µs)
– Timing(s)Timing(s)
● DACs of Spiroc chips set / overvoltage calibratedDACs of Spiroc chips set / overvoltage calibrated
● ““All-in-one” software (basically) implemented. Includes:All-in-one” software (basically) implemented. Includes:
– Calibration and data acquisitionCalibration and data acquisition
– Event displayEvent display
– AnalysisAnalysis
● Initial data taken (~150,000 events in 2 minutes)Initial data taken (~150,000 events in 2 minutes)
Strontium-90 Teststand UpdateStrontium-90 Teststand Update 66//8802/12/1502/12/15
Event DisplayEvent DisplayEvent DisplayEvent Display
current event(ADC and p.e.)
pedestal run
LED run
accumulatedlight yield
light yieldafter cluster finding
cluster width
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Initial ResultsInitial ResultsInitial ResultsInitial Results
cut for single cluster events(seed: 2.5 p.e., neighbour: 1.5 p.e., sum: 2.5 p.e.)
decrease due totilted SiPM mount
mean light yield~6-8 p.e.
undershoots
100 – 300 eventsper channel
Strontium-90 Teststand UpdateStrontium-90 Teststand Update 88//8802/12/1502/12/15
Conclusion & OutlookConclusion & OutlookConclusion & OutlookConclusion & Outlook
● Nicely working teststandNicely working teststand
● Data acquisition and analysis in a couple of minutesData acquisition and analysis in a couple of minutes
● Events rather homogeneously spread across matEvents rather homogeneously spread across mat
● Possibility of horizontal scan givenPossibility of horizontal scan given
● Make setup light tight (box around whole teststand)Make setup light tight (box around whole teststand)
● Reduce “undershoots” (e.g. trigger/absorber above mat)Reduce “undershoots” (e.g. trigger/absorber above mat)
● Comparison between Comparison between 9090Sr and cosmic teststandSr and cosmic teststand
– Same mat in both setupsSame mat in both setups
– Simulations of setupsSimulations of setups
– Initial results not comparable due to difference in energy Initial results not comparable due to difference in energy deposition, mat type etc.deposition, mat type etc.