Beta-ray test for strip scintillator readout MPPC

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Beta-ray test for strip scintillator readout MPPC

• GLD Cal group meeting _at_ KEK
• 06/2/28 (Tue)
• Niigata university
• Sayaka IBA

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Contents

1. Motivation
2. Best type of scintillator surface covering
3. Readout MPPC
4. Setup of beta-ray test
5. Results
6. Signal
7. Discussion of number of photon from fiber
8. Compare with readout PMT
9. Summary
10. Future plan

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1. Motivation

• Scintillator Study
• Compare of many type of surface covering
• Select 10x40x2mm and 3M film
• MPPC study
• Measurement of performances
• Beta-ray bench test
• (scinti WLS fiber MPPC)

Example of future Calorimeter design
Scintilltor 10x40x2mm Readout MPPC

• Can MPPC really receive few photon from
  scintillator??
• Compare to number of photon from strip
  scintillator readout MAPMT studied by
  Jacosalem-san

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2. Best type of scintillator surface covering
Select !
40mm
80mm
120mm

• From Jacosalem-san study
• 3M radiant mirror film has the greatest pulse
  height
• Using 40mm length, we can catch enough signal

Select 3M film surface covering and 40mm length
for beta-ray test
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3. Readout MPPC

• First type from HPK,100pixels
• Gain 1.41x107
• Deviation of PH (RMS) 10
• Efficiency (average of 50pixels)
• 59 at 49.0V
• Efficiency (laser light all covered include
  cross talk)
• 75 at 49.0V. 80 at 49.1V

Efficiency ?1pixel, Bias 49.0V
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4. Setup of beta-ray test
Setup

• We connected scintillator and MPPC through
  wavelength sifter fiber and tried beta ray test
• Measurement conditions
• Scintillator 10x40x2mm strip type (surface 3M
  mirror sheet)
• MPPC first MPPC (100pixels), Bias 49.1V
• Source 90Sr (beta-ray)
• WLS fiber F1.0mm, length 20cm, Y-11 (Kuraray)
• Trigger scintillator PMT

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5. Results
ADC graph
MPPC
2mV (MPPC)
250ns
Trigger PMT
Pedestal (using clock)
Signal
Signal from oscilloscope (up) from MPPC, (down)
from PMT

• MPPC readout timing is same level as PMT timing
• No right leak

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Results cont number of photoelectron
of Event
MPPC can detect MIP signal
ADCcount

• Pulse height arithmetical mean (????) -
  pedestal mean
• 66.1 (ADCcount)
• Number of detection photoelectron from MPPC
  6.1pe

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Results cont number of photon from fiber
Efficiency is different between MPPC and PMT We
cant discuss the merits to compare only number
of photoelectron or pixel
Checked number of photon from fiber Both
readout (MPPC and PMT) type use same condition
scintillator and fiber So, number of photon from
fiber must be same
We considered,,, Efficiency for MPPC readout
Particle detection effect (PDE e) Light spread
loss from fiber Efficiency for PMT readout
Only quantum efficiency (QE)
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Results cont

• We considered to PDE and light spread loss from
  fiber
• The optical resin is coated on detection surface
  of MPPC
• Light spread from fiber and MPPC has light loss
• 43 loss for 1.0mm diameter fiber

PDE (e) egeomQEeguiger 5080 (at 49.1V)
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Number of photon for MPPC detection Nphotons
Nphotons 15.8 (photons)
( of fired pixel Nfired 6.1, of total
pixel Ntot 100 )
Consider to light loss -gt Number of photon from
fiber 28(photons)
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6. Compare of scinti - PMT result

• We measured beta-ray signal from scintillator PMT
  readout to compare MPPC readout
• Measured by Jacosalem-san
• Measurement conditions
• Readout PMT 16ch MAPMT (H6568-10, HV -950V,
  QE 20)
• Same as conditions of readout MPPC
• Scintillator 10x40x2mm, surface covering 3M
  film
• Beta-ray source 90Sr
• WLS fiber diameter 1.0mm,
• length 20cm from PMT

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PMT result cont -- number of pe and photon
Example of light yield

• Number of photoelectron from PMT 5.8 pe
• Number of pe number of photon from fiber x QE
  of PMT (20)
• number of photon from fiber 29(photons)

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7. Summary of beta-ray test

• We can see beta-ray signal from scintillator
  readout MPPC
• Compare detection (number of pixels or
  photoelectron) and number of photons from fiber
  
• Light detection ability of MPPC is good as PMT
  for MIP
• The way of calculation for light loss from fiber
  spread is almost good
• We can say that signal of 1pixel signal of
  1photonelectron

Device Fiber dia (mm) of detection photonelectron of photon from fiber
MPPC 1.0mm 6.10.7 (pixels) 2810 (photons)
PMT 1.0mm 5.80.5 (pe) 296 (photons)
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8. Future plan at Niigata

• Check to number of photon from laser using PMT
• Use photon counting PMT (R6353P, R6358-10 side
  on type)
• Laser light inject PMT directly
• Search 1photonelectron peak
• Check 1pixel event is certainly from 1photon
• 1photon laser light inject MPPC
• UG students are studying SiPM from Russia and
  MPPC 400pixels (first type)