WLS Light Collectors - UC Davis

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• Use LED as light source • 405 nm LED provide Cerenkov-like photons • adjusted to give ~20 photons/integration gate • Low tech – black plastic 55 gal. drum • cut top off to hang PMT/plate from • fiber runs to bottom and into quartz light diffuser • 2 nd PMT used as reference • time reference for time degradation measurements • allows cancellation of LED fluctuations 8
• Using a Hamamatsu HQE 10” R7081 PMT • On loan from UPenn – slight chance they may get a working unit back • Attached a collar to allow safe handling and mounting for tests Characteristics • Gain ~10 7 at 1585 V bias • Dark rate: ~4kHz after 24 hours in dark Adjustable collar with foam interface between plastic and PMT Notched “arms” for supporting PMT and LC plate in water tank 9
Page 1 and 2: LBNE Norm Buchanan, William Johnsto
Page 3 and 4: • Explored for IMB • Square pla
Page 5 and 6: • Build and Test Prototype • Pr
Page 7: DAQ room SRS pulser 0.5 m fiber spl
Page 11 and 12: Test fit (no Tyvek) Leveling LV pla
Page 13 and 14: PMT Only for all plots • Testing
Page 15 and 16: BC-499-76 Tyvek+RTV Misc costs (set
Page 18 and 19: PMT PMT • Want to get light in th
Page 20 and 21: • Contamination • ultra-pure wa

WLS Light Collectors - UC Davis

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