1. Pre-shipping PMT screening at Chiba Chiba University Shigeru Yoshida for Kazuhiro “ Jee ” Fujimoto

2. Freezer Produced by Nihon Freezer Temp –32degree

3. PMT Setting into Freezer Base circuit Diffuser attached to UV LED

4. 50nsec CAMAC Crate Controller Crate Controller ADC GP-IB Function Generator Function Generator NIM Amp (*10) Discriminator Gate Generator Scaler PCI Card CAMAC Interface CAMAC Interface GP-IB Interface GP-IB Interface Gate Generator LinuxPC TTL-NIM Converter TTL-NIM Converter Sync. UV LED PMT Freezer(-32 ℃ ) Gate Signal Setup

5. ADC Spectrum （ Low Gain) Without Amp With Amp

6. ADC Spectrum(High Gain) Without Amp With Amp

7. ADC Spectrum(Log Scale) Without Amp With Amp HV 2000V

8. Gain vs HV W/o Amp w/ Amp

9. Gain with Amplification calibrated

10. Crosscheck Without Amp With Amp

11. Comparison Light w/o amp Dark w/ amp

12. Gain Summary Gain at 2000V Our Criteria is 5×10 +7 with 2000 V. 11 out of 14 PMTs satisfied it.

13. 8μsec CAMAC Crate Controller Crate Controller ADC GP-IB Function Generator Function Generator NIM Amp (*10) Discriminator Gate Generator Scaler PCI Card CAMAC Interface CAMAC Interface GP-IB Interface GP-IB Interface Gate Generator TTL-NIM Converter TTL-NIM Converter Sync. UV LED PMT Freezer(-32 ℃ ) Setup for the noise measurement

14. Gain vs Noise Rate NoiseRate[Hz] Gain PMT # SF0050

15. Gain vs Noise Rate NoiseRate[Hz] Gain HV is 2000V

16. Summary Gain, P/V and noise has been measured for the 14 tubes before shipping to UW/DESY/Stockholm No problems on noise and P/V has found Some low gain tunes needs amplification for single p.e. measurement with HV < 1700 V 3 tubes out of 14 has might-be-too-low gain of ~4x10 7 with 2000 V The excel table and ADC spectrum data can be downloaded from our website.

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