APD test in Liquid Xe
T. Tauchi, KEK
Daughter card
Pre-amplifier
Postamplifier
AMPTEK
ORTEC
A250
575
Circuit in the Daughter card
5
4
2
JFET, 2SK152, feedback C, 0.1pF/1pF and R, 1GΩ/100MΩ
APD-1
C3
3
2PF/2125
U1
D
G
T4
PIN
R2
500M/2125
1000PF/2125
3
2
S
2SK152
CN2
C2
C4
1
DRAIN_2
TH1.6-M2
1
C1
HV
TH1.6-M2
1
CN1
bias HV
1
1
R1
500M/2125
DETECTOR_1
1
1000PF/2125
DRAIN_1
T3
PIN
DETECTOR_2
APD-2
T2
PIN
TEST
2PF/2125
U2
D
G
1
2
S
2SK152
2SK152
FEEDBACK_1
TH1.6-M2
1
TH1.6-M2
1
CN6
T10
AP835-01
1
1
1
T9
AP835-01
T8
AP835-01
1
CN5
TH1.6-M2
1
T7
AP835-01
FEEDBACK_2
1 2 3
D S G
C6
1
C5
R4
0.1PF/2125
T5
AP835-01
1G/3216
0.1PF/2125
R3
1
T6
AP835-01
CN4
TH1.6-M2
1
CN3
1G/3216
1
T1
PIN
3
APD (S8664-55, short cable) with
241A
mNaI
in room temperature
with the feedback capacitor of 0.1pF
Pulse Height ( mV )
100000"
■ : Postamp
10000"
◆ : Preamp
▲ : Postamp (Vincent)
1000"
100"
10"
bias voltage=150V
1"
0"
50"
100"
150"
200"
250"
300"
350"
bias voltage (V)
400"
450"
500"
APD (S10937-9390(x)) with
241A
mNaI
at room temperature
with the feedback capacitor of 1pF
900"
Relative Gain
800"
700"
600"
Gain"by"preamp"
500"
Gain"by"postamp"
400"
Gain(1pF)"preamp"
Gain(1pF)"postamp"
300"
200"
100"
0"
60"
110"
160"
210"
260"
bias voltage (V)
6
Windowless No.2 in the chamber
APD (S10937-9390(x)) with
137C
s
in Liquid Xe
with the feedback capacitor of 0.1pF
APD
Daughter
card
bias HV=59V, Liq.Xe
C(feedback)=1pF
Postamplifier
bias HV=59.1V, Liq.Xe
C(feedback)=1pF
Preamplifier
bias HV=59.2V, Liq.Xe
C(feedback)=1pF
bias HV=59.3V, Liq.Xe
C(feedback)=1pF
8
bias V=59.4V, Liq.Xe
C(feedback)=1pF
Test pulse : bias V=59V, Liq.Xe
C(feedback)=1pF
bias V=60V, Liq.Xe
C(feedback)=1pF
bias V=59.2V, Liq.Xe
C(feedback)=1pF
9
Windowless No.2 in the chamber
APD (S10937-9390(x)) with
137C
s
in Liquid Xe
with the feedback capacitor of 1pF
450"
400"
Relative Gain
350"
300"
250"
gain@pre4amp"
gain@post4amp"
200"
150"
100"
50"
0"
58.8"
59"
59.2"
59.4"
59.6"
59.8"
bias voltage (V)
60"
60.2"
Windowless No.2 in the chamber
Test pulse
bias HV=0V
bias HV=+64V
becomes very unstable at the bias HV > +66V
bias HV=+64V
bias HV=+64V
bias HV=+66V
bias HV=+66V
Windowless No.3
Test pulse
bias HV=0V
becomes very unstable at the bias HV > +60V
bias HV=+60V
Windowless No.4
Very noisy with 241Am-NaI light pulser
especially at the bias HV > +66V
But, stable without the light pulser with no dependence of the bias HV
Windowless No.3
Test with LED as light source
bias HV=200V
bias HV=300V
bias HV=0V
名越（横浜国大）、2012年1月24日：No.3とNo.4のAPDをお借りしているのですが、No.3は信号を確認したあとにHVをかけ
たのですが、0V,200V,400Vのプリアンプとメインアンプを通ったあとの波形、波高値は同じでした。No.4は信号を確認した
あと(ただしNo.3に比べて波高値が小さかった)、HVを350V付近まであげたら、信号がおかしくなり、それ以降はHVを250V
程度まで上げると同じような現象が起こることが確認できました。