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IceCube is a neutrino observatory at Earth's South Pole that uses glacial iceas detector medium. Secondary particles from neutrino interactions produceCherenkov light, which is detected by an array of photo detectors deployedwithin the ice. In distinction from the glacial bulk ice, hole ice is therefrozen water in the drill holes around the detector modules, and is expectedto have different optical properties than the bulk ice. Aiming to improvedetector precision, this study presents a new method to simulate thepropagation of light through the hole ice, introducing several new calibrationparameters. The validity of the method is supported by a series of statisticalcross checks, and by comparison to measurement and simulation results fromother calibration studies. Evaluating calibration data indicates a stronglyasymmetric shielding of the detector modules. A preliminary analysis suggeststhat this cannot be accounted for by the shadow of cables, but can be explainedby hole ice with a suitable scattering length, size, and position relative tothe detector modules. The hole-ice approximation, which is used in the standardsimulation chain is found to disagree with all existing direct-propagationmethods and should be recalculated with a new direct-simulation run.

The Effect of Hole Ice on the Propagation and Detection of Light in IceCube