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Status of the PMT development for KM3NeT

Status of the PMT development for KM3NeT. Lew Classen and Oleg Kalekin for KM3NeT Consortium VLVnT11, Erlangen 12.10.2011. PMT specification. Quantum efficiency (QE) at 470nm 20% Transit time spread (TTS) <2ns ( σ ) Inhomogenity of cathode response <10%

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Status of the PMT development for KM3NeT

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  1. Status of the PMT development for KM3NeT Lew Classen and Oleg Kalekin for KM3NeT Consortium VLVnT11, Erlangen 12.10.2011

  2. PMT specification • Quantum efficiency (QE) at 470nm 20% • Transit time spread (TTS) <2ns (σ) • Inhomogenity of cathode response <10% • Gain >2x106 • Peak to valley ratio >3 • Supply voltage <1400V • Dark count rate at 15°C <3 kHz     • Length <12cm • Convex input window 198mm radius L.Classen, O.Kalekin: PMTs for KM3NeT

  3. PMT manufacturers After Photonis cancelled PMT production: Companies ET Enterprises, Hamamatsu, and MELZ Development of new PMTs Delivery of 50-100 PMTs from each company for optical module prototyping Possible production of PMTs for KM3NeT, time scale 3-4 years: ~200,000 – ET Enterprises, Hamamatsu ~40,000 – MELZ L.Classen, O.Kalekin: PMTs for KM3NeT 3

  4. ET Enterprises D783FL PMTs First 2 PMTs tested at KVI and Nikhef 11 PMTs delivered 100 PMTs till end of the year More detail in talks of Q.Dorosti and A.Cormack 45 dummy PMTs delivered L.Classen, O.Kalekin: PMTs for KM3NeT

  5. MELZ Amplifiers (dynode structure) produced and successfully tested in another envelope 82mm MELZ PMT under internal tests in the company. Expected delivery – October 2011 L.Classen, O.Kalekin: PMTs for KM3NeT

  6. Hamamatsu R6233-01MOD PMTs Three PMTs delivered at the end of January Next 10 delivered in September 50 PMTs till end of November L.Classen, O.Kalekin: PMTs for KM3NeT 6

  7. Quantum efficiency Hamamatsu 3-inch R6233-01mod PMTs QE: 26-28% @ 380nm, >20% @ 470nm L.Classen, O.Kalekin: PMTs for KM3NeT

  8. Quantum efficiency Hamamatsu 3-inch R6233-01mod PMTs QE: 26-28% @ 380nm, >20% @ 470nm 20 L.Classen, O.Kalekin: PMTs for KM3NeT

  9. Transit time spread (TTS) Hamamatsu 3-inch R6233-01mod PMTs Fast laser, single photoelectron illumination level, diffuser ~0.3 pe threshold, TDC 25ps/channel SN TTS,σ (ns) 3519 3517 3520 3525 3529 3532 5010 5013 2.6 2.2 2.5 2.6 2.2 2.3 2.2 2.5 Transit time (25ps/ch) L.Classen, O.Kalekin: PMTs for KM3NeT

  10. Summary and outlook ET Enterprises and Hamamatsu provide new 3-inch PMTs to make first optical modules Hamamatsu develops new PMT with better time resolution Mass production of 200,000-400,000 three-inch PMTs on a time scale of 3-4 years possible L.Classen, O.Kalekin: PMTs for KM3NeT 10

  11. Thank you very much for your attention!

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