PP

1
PP APD Test Report
PP
APD
Damaged 2 years ago
PIN

• Cooling system
• PP aging
• APD aging

• Ken Jeri
• from Fu Jen Catholic Univ., Taiwan
• 2009/7/7 3rd Belle-II Open meeting

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News since 2nd Belle-II open Meeting

• We Taiwan group got 4 APDs and 1 HAPD from KEK.
  In National Taiwan Univ., three students in
  their master courses tested them. Jing-Ge can
  explain the details. They have some progress.
• In Fu Jen Catholic Univ.,
• we build a water cooling system for our APDs.
• We turn on the HV LED 24 hours everyday for 3
  months. The aging results would show later.

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Cooling System (some pictures)
9mm
3mm
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Cooling System (some pictures)
Output
Input
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Size of the Cooling Block
13.7
17.7
Water In
f3
M5
28.3
10.3
Water Out
9
Top View
Side View
Unit mm
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Cooling system takes 30 minutes to become stable
in the beginning. (Setting temp. Measured
temp.)
(each point takes 2 seconds)
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HV light with Temp. (APD)
Temperature controlled by cooling system within
0.5?
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GAIN Ratio of APD (use PIN data)
We check denominator and numerator data.
PIN
PIN
HV-450V ? -400V LV-10V
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GAIN of APD (use PIN data)
denominator data is increased LED luminous
intensity increased.
stable
increased
PIN
PIN
HV-450V ? -400V LV-10V
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APD output voltag HV light and Dark
Numerator data is stable.
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Summary for cooling system

• Good enough to control the temperature of APD!

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Gain Ratio of P.P.
During Aging Test
PIN
PIN
Pentode Mode-1kV Diode Mode-50V

• Gain Ratio of APD

PIN
PIN
HV-450V ? -400V LV-10V
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Schematic Diagrams for APD
We use 400V for Serial No. AA0705 450V for
Serial No. AA0724
-450V
450 V
450 V

• Light Source Blue LED

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Schematic Diagrams for P.P.
Pentode mode
Diode mode
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HV light with GAIN of PP
After Fixing our HV
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(No Transcript)
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HV light with Temp. (PP)
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GAIN of PP with Temp.
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Next Steps

• To control the LED temperature by water cooling
  system. (For both PP APD)
• To scale the current gain ratio result to
  Belle-II operation environment.
• Learn something about BSO crystal.