Hamamatsu R4443 Phototube for GLAST LAT ACD. Center: phototube with temporary base. Left: housing for tube testing. Upper right: waveshifting fiber bundles with connector to housing. Lower right: commercial tube socket. The pen in the lower left provides a scale for size. Photos: Deneen Ferro.



Hamamatsu R4443 phototube in a mechanical model of the housing for the ACD application. The resistor divider network is located inside the housing. In the flight configuration, the tube will have magnetic shielding and a connector to the fiber bundle carrying the light.