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Testing Status of P.P. & APD

Testing Status of P.P. & APD. KEN, JERI FU JEN CATHOLIC UNIVERSITY 2008/DEC./11. Two kinds of Samples (purpose: enlarge light signals from CsI crystals). (photo pentode tubes). (avalanche photodiodes). Schematic Diagrams for APD. We use 400V for Serial No. AA0705

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Testing Status of P.P. & APD

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

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

  3. Schematic Diagrams for APD We use 400V for Serial No. AA0705 & 450V for Serial No. AA0724 • Light Source: Blue LED • Light Intensity: detected by PIN Photodiode simulate very weak light (very simple scale)

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

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

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

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

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

  9. Summary Plots 1 HV Mode 2008 Nov.25~Dec./2 20081127 20081202 20081125 20081126 20081201 9

  10. Summary Plots 2 2008 Nov.25~Dec./2 20081127 20081202 20081125 20081126 20081201 10

  11. Summary of APD APD Type: 0724 is more stable & Gain ratio is higher. Better choose! When temperature is lower, the output voltage becomes higher. But, Gain Ratio is stable. 11

  12. 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

  13. Schematic Diagrams for P.P. 13 Pentode mode Diode mode

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

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

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

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

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

  19. Summary Plots 1 HV Mode 2008 Nov.25~Dec./2 20081127 20081202 20081125 20081126 20081201 19

  20. Summary Plots 2 2008 Nov.25~Dec./2 20081127 20081202 20081125 20081126 20081201 20

  21. Summary of P.P. Gain-ratio of the three P.P.s are stable. Type 2636 shows highest gain-ratio. Temperature doesn’t show direct effect on the P.P. output voltage. 21

  22. 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. Left Box: P.P. Right Box: APD Bottom: Box Size Setup: Outside View

  24. The distance between LED and PP samples is 34cm. The wave length of blue LED is about 450 nm. P.P. PIN PD 20cm Blue LED Inside the Box: P.P.

  25. The distance between LED and APD samples is 34cm. The wave length of blue LED is about 450 nm. APD PIN PD 20cm Blue LED Inside the Box: APD

  26. Right: voltage Bottom: temperature Output Monitoring

  27. Conclusion 27 Comparing the gain-ratio between APD and P.P., we think P.P. is better to enlarge the light from pure CsI crystal.

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