Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 98: Experimental Methods (general) 4

T 98.7: Vortrag

Donnerstag, 24. März 2022, 17:50–18:05, T-H29

Geometry Calibration of IceCube - A new Likelihood-based Multilateration Approach — •Saskia Philippen, Christoph Günther, and Christopher Wiebusch for the IceCube collaboration — RWTH Aachen University - Physics Institute III B, Aachen, Germany

The IceCube Neutrino Observatory consists of 5160 Digital Optical Modules (DOMs), attached to 86 cable strings, which are embedded in the Antarctic ice in a depth between 1.5 to 2.5 kilometers. The reconstruction of neutrino events is based on the arrival times of Cherenkov light at the position of these DOMs. Currently, these positions are only known with a precision of about one meter, because of the uncertainty during the hole drilling process. For several calibration purposes IceCube has produced data-sets in which flashes from LEDs installed inside the DOMs are detected by the surrounding DOMs. The transit times of these signals can be converted into distances between each pair of DOMs. We have developed a multilateration algorithm which fits the positions of all DOMs to these distances in a global maximum-likelihood analysis. The here presented algorithm can be applied beyond IceCube also to the acoustic calibration systems that are foreseen in the IceCube Upgrade and IceCube-Gen2.