Design of Optical Module Candidates for IceCube-Gen2

IceCube-Gen2 is a high energy extension of IceCube, the world's largest neutrino telescope at the South Pole, that expands the high energy neutrino sensitivity by an order of magnitude for the next decades of neutrino astronomy. The IceCube-Gen2 optical array has a planned fiducial volume of 7.9 km^3, 8 times larger than that of IceCube, and will deploy 9,600 modules in 120 new strings with 240 m spacing. Two newly developed optical module types increase IceCube's current sensitivity per module by a factor of three by integrating 16 and 18 newly developed four-inch PMTs, respectively, in specially designed 12.5-inch diameter pressure vessels. In this talk, we will introduce the unique design of the new optical module, and review the current status of development and the details of the expected performance.