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A first look of the 10” High QE PMT

A first look of the 10” High QE PMT. “Super Bialkali” photocathode. Shigeru Yoshida for Yuusuke Hasegawa and Mina Inaba Dep. of Physics, Chiba University. Which is which?. Our IceCube PMT. Super Bialkali PMT. The Graduate Student. Photocathode calibration. QE×CE Absolute calibration.

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A first look of the 10” High QE PMT

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  1. A first look of the 10” High QE PMT “Super Bialkali” photocathode Shigeru Yoshida for Yuusuke Hasegawa and Mina Inaba Dep. of Physics, Chiba University

  2. Which is which? Our IceCube PMT Super Bialkali PMT The Graduate Student

  3. Photocathode calibration QE×CE Absolute calibration Reference PMT Absolutely calibrated PMT X-stage LED DOM motor LED Slit 1mm NDfilter Reflectivity : 14.5%±0.73 Transmission : 50.7%±2.54 Systematic error ~7% @ room

  4. Absolute QE×CE IceCube PMT IceCube PMT

  5. PMT 2D Uniformity Scan Averaged PMT2D CEMap(~94PMTs) The direction of the first dynode

  6. 2D QE x CE Map of PMT @337nm Systematic error ～8% TA2259 TA2349 TA1895 TA2026 20 0 -0.15m 0.15m 15.0% 16.7% 18.1% 15.5% TA2086 TA2146 TA2182 TA2374 17.9% 16.0% 18.7% 17.8%

  7. The Test bench CAMAC PCI Card GP-IB Crate Controller CAMAC Interface Function Generator ADC GP-IB Interface Sync. LinuxPC 70nsec Gate ~100ns Freezer(-35℃) Signal 375 nm UV LED 4~6nsec PMT NIM Gate Generator Discriminator diffuser 2kHz, ~0.01 photo-electron/shot TTL-NIM Converter

  8. The Test Bench Diffuser attached to the UV LED In the Freezer box Freezer -35℃ 375nm UV LED 2kHz, ~0.01 photo-electron/shot

  9. HV dependence of the PMT gain Super PMT Gain (x107) 107 Gain

  10. SPE Charge Historgram Super Bialkali PMT @5x107 -35C Our IceCube PMT pedestal SPE

  11. P/V -35C Super PMT Peak/Valley Gain (x107)

  12. Charge Resolution -35C Super PMT sq/q0 30% line Gain (x107)

  13. The IceCube PMT charge response One measurement Peak of gaussian ~ 1 p.e. Charge resolution 29% Average over 118 PMTs Mean 15% less

  14. Now “Super” PMT case One measurement Average over 118 PMTs

  15. Dark Rate Discri. threshold 0.25 p.e. Super PMT Dark Rate [Hz] 1kHz Temperature [C]

  16. Summary • QE ~ 35 % @ 365 nm (IceCube PMT – 25%) • Charge response, cathode uniformity comparable with the IceCube PMTs – P/V is even better. • Dark Rate ~ 1kHz @ -35 C (IceCube PMT ~ 600Hz)

  17. Backup slides

  18. Absolute QE QE measured at -32℃tend to 5~10% lower than measured at 24℃ However, they agree within the systematic error. Keno_Inuzaka(TA1056) Daikaku_Inumura(TA1176) Sosuke_Inukawa(TA1181) 15.0% 12.5% 13.2% 14.2% 16.4% 15.4% 10.6% 9.70% 16.6% 15.7% 11.3% 10.4% 9.14% 8.93% 18.3% 16.3% 16.0% 13.3% 4.69% 4.30% 4.23% 3.74% 4.88% 3.96% Red : measured at 24℃ Blue : measured at -32℃

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