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

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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

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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

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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)

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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

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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.