pmt evaluation and testing
DESCRIPTION
PMT Evaluation and Testing. Evaluation Characterization Production testing. (won’t include water/pressure tests here, or radioactivity). Goals--Evaluation. We want to p ick a PMT that: . Optimizes #identified photons/$ Has timing `good enough’ to do experiment Has low failure rate - PowerPoint PPT PresentationTRANSCRIPT
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PMT Evaluation and Testing
• Evaluation• Characterization• Production testing
(won’t include water/pressure tests here, or radioactivity)
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Goals--EvaluationWe want to pick a PMT that:
1. Optimizes #identified photons/$2. Has timing `good enough’ to do experiment3. Has low failure rate4. Has good overall stability
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Goals--Evaluation1. Optimizes #identified photons/$
#identified depends on:• Overall coverage (inc. reflectors/wavelength shifters)• QE (including magnetic field effects)• Ability to resolve multiple hits via Q or T• Noise rate
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Goals--Evaluation1. Optimizes #identified photons/$
R5912-02R1408
Resolution with charge better on left
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Goals--Evaluation1. Optimizes #identified photons/$
R5912-02 R1408
Resolution with time better on right
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Goals--Evaluation1. Optimize #identified photons/$
Extra collection vs. stability
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Goals--Evaluation1. Optimizes #identified photons/$
50,000 PMTsDt = 180 nsRpmt = 1000 Hz Effects of PMT
noise rates on trigger
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Goals--Evaluation
2. Has timing `good enough’ to do experiment
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Evaluation PlanS4 requested 10x4types of PMTs for evaluation in Year 1Then 50 of selected type in Year 2Project naturally divides into two classes (not counting pressure or radioactivity tests):
R&D: concentrators/reflectors
wavelength shifter magnetic compensation bases
Strict evaluation: Relative Q.E. Charge spectrum Timing Noise Stability
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Evaluation Plan
Plenty of places to do testing:
DavisBrookhavenWisconsinPennDrexel…(nearly every institution here)
We should reproduce critical measurements at more than one place…but not at every place.
We also need simulation input (How many pe do we need?)
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Evaluation Plan
As of S4:• PMTs arrive at Penn, bases added• Small number of simple measurements made, shipped to other institutions
Brookhaven for magnetic field/temperature tests Davis for magnetic field tests and wavelength-shifter tests Drexel for single-pe charge tests and concentrator
development Penn for single-pe charge and timing studies, and q.e. Wisconsin for gain stability, q.e., charge and timing, water
tests …
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Evaluation Plan
As of S4:• Need database of results on critical numbers/plots
Noise rates Gain vs. HV Q.E. Timing and charge spectra Magnetic compensation effects
• Decision on PMT in Year 1 (is this wise?) Critical to have simulation input in context of
physics goals and priorities
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Goals--CharacterizationWant model inputs from PMT measurements---Most important for low E program• angular and wavelength dependence of response• Detailed timing and charge spectra at 1 pe and above• Long term stability and behavior• Gain vs. HV (compare to manufacturer)• Noise variations• Studies on full optical modules (in water)• Develop production testing plan
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Characterization PlanWant one (or two) institutions to do bulk of measurements
• Database of PMT data• Translation into simulation model inputs• Apparatus and plan for production testing
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Production Testing
• Reject non-working PMTs• Reject PMTs outside of spec • Gain matching
Testing 100 PMTs/day ~ 5 years…
Depending on timing, testing in-situ may be most sensible approach
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Conclusions
• Evaluation of PMTs relatively simple, but will involve several institutions focusing on different areas
• Should divide activities by resources and interest
• Characterization plan will be defined by physics needs and what we learn during evaluation
• Production testing is a bigger challenge and needs some thought