The design and performance of IceCube DeepCore

► IceCube DeepCore lowers the neutrino energy threshold in IceCube to as low as 10 GeV. ► The surrounding IceCube detector is an active veto against cosmic ray muons. ► IceCube DeepCore uses higher quantum efficiency PMTs in very clear ice. ► IceCube DeepCore has a module density 5× higher than the rest of IceCube.