ken, jeri fu jen catholic university 2008/dec./11 1 testing status of p.p. & apd
TRANSCRIPT
KEN, JERI FU JEN CATHOLIC UNIVERSITY
2008/DEC./11
1
Testing Status of P.P. & APDTesting Status of P.P. & APD
Two kinds of Samples(purpose: enlarge light signals from CsI
crystals)2
(photo pentode tubes)
(avalanche photodiodes)
Schematic Diagrams for APD3
)10&()10&(
)300&()300&(_
VdarkVVlightV
VdarkVVlightVRatioGain APD
We use 400V400V for Serial No. AA0705& 450V450V for Serial No. AA0724
•Light Source: Blue LED•Light Intensity: detected by PIN Photodiode simulate very weak light (very simple scale)
Results: 2008/Nov./254
Temperature, ℃
Time, min Time, min
Time, min
Results: 2008/Nov./265
Temperature, ℃
Time, min Time, min
Time, min
Results: 2008/Nov./276
Temperature, ℃
Time, min Time, min
Time, min
Results: 2008/Dec./17
Temperature, ℃
Time, min Time, min
Time, min
Results: 2008/Dec./28
Temperature, ℃
Time, min Time, min
Time, min
Summary Plots 19
Output Voltage of APD 5 Days
600
700
800
900
1000
0 1 2 3 4 5 6
Days
Out
put
Volt
age
(mV)
APD 0705
APD 0724
HV Mode
2008 Nov.25~Dec./2
2008112520081126
2008112720081201
20081202
Summary Plots 210
GAIN of APD 5 Days
30
40
50
60
70
0 1 2 3 4 5 6
Days
Rati
o
APD 0705
APD 0724
2008 Nov.25~Dec./2
2008112520081126
2008112720081201
20081202
Summary of APD
APD Type: 07240724 is more stable & Gain ratio is higher. Better choose!
When temperaturetemperature is lower, the output voltage becomes higher. But, Gain Ratio is stable.
11
Next Step of APD
We will keep measuring these two APDs and will provide their results on the webpage soon.
Could we have two more APDs? We can tell which type is better.
We are making a magnetic field now. We hope to know how will it affect the gain ratio of APD.
12
Schematic Diagrams for P.P.13
Pentode mode
Diode modediodediode
pentodepentodePP VdarkVVlightV
VdarkVVlightVRatioGain
)100&()100&(
)1000&()1000&(_
Results: 2008/Nov./2514
Temperature, ℃
Time, min Time, min
Time, min
Results: 2008/Nov./2615
Temperature, ℃
Time, min Time, min
Time, min
Results: 2008/Nov./2716
Temperature, ℃
Time, min Time, min
Time, min
Results: 2008/Dec./117
Temperature, ℃
Time, min Time, min
Time, min
Results: 2008/Dec./218
Temperature, ℃
Time, min Time, min
Time, min
Summary Plots 119
Output Voltage of PP 5 Days
4000
4200
4400
4600
4800
5000
5200
5400
0 1 2 3 4 5 6
Days
Out
put
Volt
age
(mV)
PP 2630
PP 2632
PP 2636
HV Mode
2008 Nov.25~Dec./2
2008112520081126
2008112720081201
20081202
Summary Plots 220
GAIN of PP 5 Days
140
160
180
200
220
240
260
0 1 2 3 4 5 6
Days
Rati
o
PP 2630
PP2632
PP 2636
(PP 2630)線性
(PP2632)線性
(PP 2636)線性
2008 Nov.25~Dec./2
2008112520081126
2008112720081201
20081202
Summary of P.P.
Gain-ratio of the three P.P.s are stable. Type 26362636 shows highest gain-ratio.
TemperatureTemperature doesn’t show direct effect on the P.P. output voltage.
21
Next Step of P.P.
We will keep measuring these three P.P.s and will provide their results on the webpage soon.
We are making a magnetic field now. We hope to know how will it affect the gain ratio of P.P.
22
23
Setup: Outside View
Left Box: P.P.
Right Box: APD
Bottom: Box Size
24
Inside the Box: P.P.
The distance between LED and PP samples is 34cm.
The wave length of blue LED is about 450 nm.
20cmPIN PD
25
Inside the Box: APD
The distance between LED and APD samples is 34cm.
The wave length of blue LED is about 450 nm.
20cmPIN PD
26
Output Monitoring
Right: voltage
Bottom: temperature
Conclusion
Comparing the gain-ratio between APD and P.P., we think P.P. is better to enlarge the light from pure CsI crystal.
27