PP & APD Test Report
ZG2636
ZG2632
ZG2630
0724
PP
0705
NO.7
NO.8
APD
Damaged
2 years
ago
•Cooling system
•PP aging
•APD aging
PIN
Ken & Jeri
from Fu Jen Catholic Univ., Taiwan
2009/7/7 3rd Belle-II Open meeting
1
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.
Cooling System (some pictures)
3mm
9mm
Cooling System (some pictures)
Input
Output
Size of the Cooling Block
13.7
17.7
Water In
φ3
M5
28.3
10.3
Water Out
9
Side View
Top View
Unit: mm
Cooling system takes 30 minutes to
become stable in the beginning.
(Setting temp. = Measured temp.)
(each point takes 2 seconds)
HV light with Temp. (APD)
Temperature controlled by cooling system: within 0.5℃
GAIN Ratio of APD (use PIN data)
PIN
PIN
We check
denominator
and numerator
data.
HV：-450V 、 -400V
LV：-10V
GAIN of APD (use PIN data)
denominator data is increased: LED luminous intensity increased.
stable
increased
PIN
PIN
HV：-450V 、 -400V
LV：-10V
APD output voltag: HV light and Dark
Numerator data is stable.
Summary for cooling system
• Good enough to control the temperature of
APD!
During Aging Test…
•Gain Ratio of P.P.
PIN
PIN
Pentode Mode：-1kV
Diode Mode：-50V
•Gain Ratio of APD
PIN
PIN
HV：-450V 、 -400V
LV：-10V
Schematic Diagrams for APD
We use 400V for Serial No. AA0705
& 450V for Serial No. AA0724
-450V
Gain _ RatioAPD
V (light &450
300V )  V (dark &450
300 V )

V (light & 10V )  V (dark & 10V )
•Light Source: Blue LED
Schematic Diagrams for P.P.
Pentode mode
Gain _ RatioPP 
V (light & 1000 V ) pentode  V (dark & 1000 V ) pentode
V (light & 100V ) diode  V (dark & 100V ) diode
Diode mode
HV light with GAIN of PP
After Fixing our HV
HV light with Temp. (PP)
GAIN of PP with Temp.
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.