Scintillator HCal R

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Scintillator HCal RD Update

• Vishnu V. Zutshi
• for
• NIU/NICADD

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Introduction

• Snapshot of past results
• Photo-detector characterization
• X-talk
• Reflectors
• Summary

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Digital HCal with Scintillator
Density based PFA
Snapshot of past results I
Needs validation in test beam
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Stack Tile Fabrication
15pe/mip
Snapshot of past results II
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Tile-Fiber-Reflector Optimization
Snapshot of past results III
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Relative LY
cast
Snapshot of past results IV
extruded
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SiPM/MRS
1000 pixels on 1mm x 1mm Bias voltage
50-60V Gain 106 Quantum x geom 12-15
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Count Rate vs. Bias
Green LED(130Hz) with clear fiber used
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Noise Amplitude vs. Bias
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Signal Amplitude vs. Bias
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SiPM Signal Pedestal examples
42.5V
43.5V
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MRS Signal Pedestal examples
50.5V
52.0V
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S/N vs. Bias
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Dark Rate
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Temperature dependence
-3/oC
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Photo-detector Irradiation

• Detectors sent to Michigan gamma irradiation
  facility
• Dosage 1MRad
• Comparison of noise and signal detection before
  and after irradiation
• Plan to irradiate with protons

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MRS before/after irradiation I
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MRS before/after irradiation II
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MRS before/after irradiation III
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Photo-Detector Scan
In collaboration with P. Polozov G. Sellberg
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Scan Results I
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Scan Results II
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X-talk (wrapped)
0.3 per side
PMT mixer
90Sr
2.72 Crosstalk Spillover
PMT mixer
90Sr
1.56 Spillover
PMT mixer
90Sr
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X-talk (mated)
1.3 per side
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Reflector Performance
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Uniformity and Reflectors
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Summary

• Good progress on scintillator-based digital
  hadron calorimetry RD studies has been made(2
  papers accepted for publication).
• Focus has shifted now to construction and
  commissioning issues for the test beam prototype
  where all this can finally be put to the test.