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The Milagro experiment observes the extensive air showers produced by veryhigh energy gamma-rays impacting the Earth's atmosphere. Milagro uses 898Hamamatsu R5912 Photomultiplier Tubes. To complete our Monte Carlo simulations,we tested the photocathode uniformity of our PMTs. The main finding was thatthe PMT gain and detection efficiency are a function of the distance from thecenter of the photocathode. Both quantities become considerably smaller as theillumination position nears the edge of the photocathode.

Photocathode-Uniformity Tests of the Hamamatsu R5912 Photomultiplier Tubes Used in the Milagro Experiment