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Evaluation of Gain Factors for Photopentode and Avalanche Photodiode in Controlled Environment

This report details the motivation and methodology for testing Photopentode (PP) and Avalanche Photodiode (APD) samples in a controlled environment using a black box setup with cooling mechanisms. It presents findings from gain factor measurements and addresses previous circuit issues. The black box, designed to mitigate high temperatures typical of Taipei summers, incorporates a cooling module to improve testing conditions. Results indicate stabilization challenges for PP while APD measurements are more consistent. Findings will inform future improvements in experimental design.

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Evaluation of Gain Factors for Photopentode and Avalanche Photodiode in Controlled Environment

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  1. P.P., APD and PIN test report Eric Chiu & Ken Chiang & Alex Chang & Jeri, Ming-Chuan Chang 2008/July/04

  2. Motivation • We have two kind of samples aiming for the upgraded ECL (in super Belle). • Photopentode (PP) x3 • Avalanche photodiode (APD) x4 • We hope to know the stability of their gain factors.

  3. 40cm 40cm 60cm Make a black box for testing: picture1 Aluminum Framework: 40cm x 40cm x 60cm

  4. 40cm 40cm 60cm Make a black box for testing: picture2

  5. ZG2636 ZG2632 ZG2630 NO.8 NO.7 0705 0724 Samples PP x3 APD x4

  6. Cool the air inside the black box • In Taipei, the weather in summer is very hot. We hope to reduce the testing temperature. (similar as in KEK.) Cooling module: 15*15*3.3mm

  7. Cooling Setup HEATING WIND for outside box From Heating Wind: 34°C FAN HEAT SINK COOLING MODULES From Cooling Wind: 15°C HEAT SINK COOLING WIND for inside box FAN

  8. Black box with cooling module: picture3 8

  9. Black box with cooling module: picture4 heatinsulationblanket Monitoring program Black Box

  10. Black Box1: PP inside P.P. PIN Polystyrene, coatwith black lacquer Temperature control

  11. Circuits for PP PIN CIRCUITS PP PENTRODE MODE (FIG1) PP DIODE MODE (FIG2) 11

  12. Definition of Gain for P.P.

  13. Results of P.P. (3 piece) • We can’t repeat our previous measurement results. Problem is • After checking our circuits with Kuzmin-san, we found our diode-mode circuit was wrong. Now, we know how to fix it.

  14. Black Box2: APD inside APD PIN

  15. Circuits for APD PIN CIRCUITS APD High Bias Voltage APD Low Bias Voltage

  16. Definition of Gain for APD

  17. Results of APD (4 piece) APDNO7 Average = 30.07 APD0705 Average = 4.67 APD0724 Average = 4.90 APDNO8 Average = 3.14

  18. Results of APD (4 piece) • It takes 20 minutes to finish the data taking. • The data record period is 1s. • The temperature precision is 0.1℃.

  19. PIN & APD output voltage

  20. Summary • APD measurement is more or less normal. • We met problems for PP measurement. But we know how to fix it now.

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