Time of Flight phototube assembly at Penn

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Denys spraying the base components with Konformal coating

Denys spraying the base components the second time

Spraying the base components the third time in order to build up several thin layers.

drying station after Konformal coating is sprayed on pmt base

first step - checking to see whether pmt goes into the aluminum gluing fixture

Inspector General Professor Joseph Kroll

applying optical cement to Winston cone and preparing the pmt assembly same as previous step, but with clear view of pmt assembly the application of optical cement takes time the Winston cone is handed over to the expert Denis applies the correcr amount to pressure on pmt then puts the fixture on Winston cone TOF Cosmic Ray test stand with preamp test station and burnin areas the use of Kapton tape is important the ready Winston cone and pmt assembly the Winston cone is lowered and contact is made first at an edge and ... ...placed on top of pmt allowing the excess glue to come out now, finally the fixture is lowered over the Winston cone and pmt assembly. The fixture centers the cone and provides weight on cone for the curing of the optical cement. Also note the centrifuge on table. Centrifuge is used to eliminate air bubbles in the optical cement before application. 14 15 The curing station. The fixtures are left along the wall for overnight curing. Sung Hwan Chung, 18