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

2. 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?

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

4. Works for two manufacturers

5. Even close to the piezo

6. 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