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T: Fachverband Teilchenphysik
T 16: GRID Computing / Experimentelle Methoden I
T 16.10: Vortrag
Montag, 19. März 2018, 18:15–18:30, Z6 - SR 2.006
In-situ calibration of the single photo-electron charge distributions of the PMTs in IceCube — •Martin Rongen and Martin Leuermann for the IceCube collaboration — III. Physikalisches Institut B, RWTH Aachen University
The IceCube Neutrino Observatory instruments about 1 km3 of deep, glacial ice at the geographic South Pole with 5160 photomultipliers (PMTs) to detect Cherenkov light of passing particles. As the arrival times and amplitudes of light at the PMTs are the only observables, a precise calibration of the PMTs characteristics is needed. Currently, one averaged single photo-electron (SPE) charge-distribution template obtained in the lab is used to describe the gain characteristic of all PMTs in the detector simulation. Having observed a median deviation of in-situ data from this template, as well as strong PMT-to-PMT fluctuations, the per-PMT charge distributions are now being calibrated. This is especially challenging due to the absence of a well-known, low-occupancy light source. In this talk, we present a convolution method to measure precise SPE charge distributions in the presence of high charge contamination.