A first calibration study for PINGU at DESY.

PINGU, the Precision IceCube Next Generation Upgrade, aims at lowering the neutrino detection threshold of the IceCube neutrino telescope to a few GeV by adding new in-fill strings to the existing IceCube/DeepCore array. The main goal of the upgrade is to provide sensitivity to the neutrino mass hierarchy utilizing atmospheric neutrinos. Precision reconstruction of the neutrino direction and energy, which is a prerequisite for the determination of the mass hierarchy, requires accurate in-situ calibration and monitoring of the PINGU digital optical modules (PDOMs) and high-level control of systematic effects like those caused by uncertainties in the optical ice properties and sensitivity of the PDOM in ice. These proceedings present an early status of calibration studies for PINGU performed at DESY. [ABSTRACT FROM AUTHOR]