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.

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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.

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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