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PMT testing at UCLA-STRB

Auger Surface Detector . . . . . . . . . . . . . . . . Plastic Tank. . 1.2 m. Tyvek Liner. Purified Water. . 3.2 m. Muons. PMT. . . Cherenkov Light. Spectrum Response. Cherenkov photons are peaked at 350~450 nm after reflection and absorption in water tank.It is matched to QE of Bi-Alkali photo-cathode..

JasminFlorian
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PMT testing at UCLA-STRB

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    1. PMT testing at UCLA-STRB

    3. Spectrum Response

    4. Signal from 6x1019eV Iron Shower

    5. Correlation between Energy, Arrival Time and Density (1019eV, 900m from the core)

    6. Specification of 8-9 PMTs for Auger

    7. Three Candidate PMTs for Auger

    8. PMT Test Facility at UCLA

    9. Single Photoelectron Peak

    11. Quantum Efficiency

    12. Gain & Dark Current of Hamamatsu

    13. Gain & Dark Current of Photonis

    14. Gain & Dark Current of ETL

    15. UCLA Setup for Linearity Measurement

    16. Linearity - Hamamatsu

    17. Linearity - Photonis

    18. Linearity - ETL

    19. Dark Pulse Rate - Hamamatsu

    20. Dark Pulse Rate - Photonis

    21. Dark Pulse Rate - ETL

    22. After Pulse

    23. After Pulse

    24. Earth Magnetic Field

    25. Earth Magnetic Field

    26. Summary of New Measurements

    27. Specs and Comparison of Three Companies

    28. Ideal PMT for Auger

    29. Summary of New Measurements

    30. DC measurements and Specs Cathode sensitivity: Sk > 50 uA/lm Skb > 7 uA/lm-B (equivalent to QE > 16% at 420nm) QE at 350 nm > 16% (337nm, 384nm for preproduction) Gain and supply voltage: Standard operation at Gain = 2x105 High Voltage should be less than 2000 V for Gain=1x106 Dark current and stability: HV and Dark current will be measured at the following gains: 5x104, 2x105, 5x105, 1x106, 2x106 PMT should be stable at 1x106. This is defined by the following I_dark(G=1x106) < 20 nA. I_dark(G=1x106)/I_dark(G=2x105) < 10.0 I_dark(G=1x106) must be stable in time (no significant fluctuation). The test listed above will be performed for all the PMTs, prior to base attachment.

    31. Pulse Measurements and Specs Dark pulse and after pulse Measured at G=1x106 within 2 hours. Dark pulse rate (>0.25pe) <10KHz After pulse rate < 5% within the gate of 200nsec ~ 5,000nsec from the main signal. This is measured by taking the charge ratio of Q_after/Q_main. Pulse linearity (no measurement for ~3 months) Measured at Gain=2x105 Anode current should be linear within +-5% up to 50mA. Single PE resolution Measured at G=1x106 Pulsed light source must be tuned to have 90% pedestal, 10% signal for Poisson distribution of average 0.1 PE. Peak to Valley ratio > 1.2 Cathode and Anode Uniformity The test listed above will be performed for 1 out of 5 for the first 100 PMTs, then 1 out of 50 for the rest. UCLA will do the all (except 4.)

    32. PMT Potting and Assembly

    33. 12 PMTs Package from Photonis

    34. Fez and Collar from Colorado State.

    35. PMT is aligned vertically

    36. Collar is glued

    37. Collar is glued

    38. Collar is glued

    39. Collar is aligned

    40. Silicone Mixer (20:1 Ratio)

    41. Silicon poured into Collar

    42. Silicon poured into Collar

    43. 12 PMTs after Potting, Waiting for Cure

    44. PMT and Base potted by Silicon

    45. Finished Assembly

    46. Cables are glued

    47. Environmental Testing

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