IceCube/ PMTs

PMT 2D Uniformity Measurement

2 Dimmentional Collection Efficiency Map

The collection efficiency depends on where a photo-electron is emitted on the photo-cathod surface. The above figure shows our scan results of IceCube PMT(TA2026).

Two figures below show the relative efficiency in two azimuthal angle slices (0deg and 90deg) for TA2026. The efficiencies plotted here are normalized so that the average efficiency over entire photocathode is 100 %. You can see the efficiency varies photon locations to locations by +- 20 %. The difference between different tubes is also visible. We will implement these effects to the IceCube detector MC.

Measurement setup

Last modified: Tue Jun 5 22:14:58 JST 2007