First results of the SCECAL beam test

1
First results of the SCECAL beam test light
yield problem

• Jun-Suhk Suh
• Kyungpook National University

2
Check linearity
Before Calibration
After Calibration
3
First results Linearity
very preliminary
Before Calibration
After Calibration
Total Energy (MIP)
Total Energy (MIP)
Incident beam energy (GeV)
Incident beam energy (GeV)
4
First results Energy resolution
very preliminary
Before Calibration
After Calibration
14
13
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Shower profile at 1 6 GeV
6 GeV
1 GeV
Layer
Layer
Strip
Strip
Beam
Beam
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Shower profile at strip 16,15,14
Strip 16
Strip 15
Strip 14
Layer
Strip
Beam
Beam
Beam
7
Shower profile at strip 1
6 GeV
Beam
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Problem uniformity of a strip
48
75
66
KNU strip with fiber
Kuraray strip with fiber
Kuraray direct
9
Problem of reflector
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Matching problem of MPPC fiber
11
Problem of hole size
Hole size
12
Solution

• Reflector problem
• Use fiber which is aluminized at the end
• Use frame as reflector
• matching problem of MPPC fiber
• Use an adapter between fiber and MPPC
• Production of new strip fiber embedded in the
  scintillator ? there will be no space between
  fiber and strip ? hole size will be exactly 1 mm

13
KNU
Shinshu Uni.
14
Check list

• Fiber type KNU used Kuraray Y11
• Comparison of light yield of Kuraray strip with
  hole groove
• Shifted MPV position from maximum value
• 2 Gaussian fit for the data before pedestal cut
• Data before pedestal cut