P.Kooijman, Nikhef KM3NeT, General Meeting, 20 February, Catania

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Presentation transcript:

P.Kooijman, Nikhef KM3NeT, General Meeting, 20 February, Catania PMT “contact lens” P.Kooijman, Nikhef KM3NeT, General Meeting, 20 February, Catania

If we go that way can we still have the concentrator ring? Why At present we have received from ETEL and Hamamatsu “concave-convex” PMTs Manufacturers say the front glass is very expensive Thin glass curved front face works just as well If we go that way can we still have the concentrator ring?

Plastic lens Possibility for “plastic” lens Glue to the front face with 45 degree edge Radius of sphere Radius of PMT front face

Works for two manufacturers

Even close to the piezo

Manufacture? Zeonex 480R Injection Molding! Fosta-Tek Zeon Europe GmbH 92% (in lucht gemeten; altijd reflectie) 3.7% per interface (1 naar binnen, 1 naar buiten) Zeonex 480R Injection Molding! Fosta-Tek Zeon Europe GmbH Unofficial 5€/unit + 20k€/mold  cost reduction for PMT-unit For 8 mm thick samples (measured in air) Quotations requested