Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 38: Methods of astroparticle physics II

T 38.5: Talk

Tuesday, March 31, 2020, 18:00–18:15, L-3.001

Performance of the UV Calibration Device for the SPICEcore hole — •Jannes Brostean-Kaiser — DESY Zeuthen

IceCube, the biggest neutrino detector in the world, will be upgraded in 2022. For this upgrade and the planned enlarged detector, IceCube-Gen2, new optical modules have been developed. One of these optical modules, the WOM, uses wavelength-shifting and light-guiding techniques to measure Cherenkov photons in the UV-range. To understand the efficiency of this new module the absorption and scattering lengths of UV-light in the South Pole ice have to be measured. The measurement was done in two campaigns (2018/19 and 2019/20) in the SpiceCore hole, a 1751 m deep hole near the IceCube array drilled for glaciology studies and filled with Estisol. To measure the ice properties a calibration device was lowered into the hole and emit UV light. A UV-sensitive detector inside the probe measures the UV photons that are scattered back. From the time distribution of these scattered photons the scattering and absorption lengths can be deduced. The design of the probe will be presented, as well as its performance during the two measurement campaign, and the results from the 2018/19 campaign and preliminary results from the 2019/20 campaign.