Characterization of photomultiplier DOM for Cherenkov detectors
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Several qualities of the IceCube Digital Optical Module (DOM) are characterized for use in the CHIPS neutrino detection project through tests of charge linearity, uniformity, gain, and Cherenkov radiation. The charge is linear in transmittance with a chi^2/ndf of 2.42. The DOM shows a radial decrease in sensitivity with a slight angular asymmetry. A nominal gain of 10^7 is reached near 1400 HV. These tests are found to largely agree with IceCube reults. The measured Cherenkov spectrum of light created inside the DOM is compared with an analytical estimate of the upper limit for photoelectrons produced at the cathode, and experimental results are found to be 62% lower than the estimated limit.