KEN, JERI FU JEN CATHOLIC UNIVERSITY 2008/DEC./11 1 Testing Status of P.P. & APD.

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Presentation transcript:

KEN, JERI FU JEN CATHOLIC UNIVERSITY 2008/DEC./11 1 Testing Status of P.P. & APD

Two kinds of Samples (purpose: enlarge light signals from CsI crystals) P.P. x3 APD x2 2 (photo pentode tubes) (avalanche photodiodes)

Schematic Diagrams for APD 3 400V We use 400V for Serial No. AA V & 450V for Serial No. AA0724 Light Source: Blue LED Light Intensity: detected by PIN Photodiode  simulate very weak light (very simple scale)

Results: 2008/Nov./25 4 Temperature, ℃ Time, min

Results: 2008/Nov./26 5 Temperature, ℃ Time, min

Results: 2008/Nov./27 6 Temperature, ℃ Time, min

Results: 2008/Dec./1 7 Temperature, ℃ Time, min

Results: 2008/Dec./2 8 Temperature, ℃ Time, min

Summary Plots 1 9 HV Mode 2008 Nov.25~Dec./

Summary Plots Nov.25~Dec./

Summary of APD 0724 APD Type: 0724 is more stable & Gain ratio is higher.  Better choose! temperature When temperature 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 mode

Results: 2008/Nov./25 14 Temperature, ℃ Time, min

Results: 2008/Nov./26 15 Temperature, ℃ Time, min

Results: 2008/Nov./27 16 Temperature, ℃ Time, min

Results: 2008/Dec./1 17 Temperature, ℃ Time, min

Results: 2008/Dec./2 18 Temperature, ℃ Time, min

Summary Plots 1 19 HV Mode 2008 Nov.25~Dec./

Summary Plots Nov.25~Dec./

Summary of P.P Gain-ratio of the three P.P.s are stable. Type 2636 shows highest gain-ratio. Temperature Temperature 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. 20cm PIN 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. 20cm PIN 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