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The IceCube neutrino observatory is composed of more than five thousand lightsensors, Digital Optical Modules (DOMs), installed on the surface and at depthsbetween 1450 and 2450 m in clear ice at the South Pole. Each DOM incorporates a10-inch diameter photomultiplier tube (PMT) intended to detect light emittedwhen high energy neutrinos interact with atoms in the ice. Depending on theenergy of the neutrino and the distance from secondary particle tracks, PMTscan be hit by up to several thousand photons within a few hundred nanoseconds.The number of photons per PMT and their time distribution is used to rejectbackground events and to determine the energy and direction of each neutrino.The detector energy scale was established from previous lab measurements of DOMoptical sensitivity, then refined based on observed light yield from stoppingmuons and calibration of ice properties. A laboratory setup has now beendeveloped to more precisely measure the DOM optical sensitivity as a functionof angle and wavelength. DOMs are calibrated in water using a broad beam oflight whose intensity is measured with a NIST calibrated photodiode. This studywill refine the current knowledge of the IceCube response and lay a foundationfor future precision upgrades to the detector.

Calibrating the photon detection efficiency in IceCube