Development of an Emitter for the Acoustic Geometry Calibration of the upcoming IceCube-Upgrade

The IceCube Neutrino Observatory is a cubic kilometer scale neutrino detector, capable of detecting neutrinos of energies ranging from a few GeV to PeV and above. IceCube-Gen2 is a planned large-scale upgrade to enhance the sensitivity for the highest energy neutrinos. As a first step, the IceCube-Upgrade is being prepared. It involves inclusion of additional sensor strings and calibration devices in the central detector region. IceCube-Gen2 will entail larger spacing of optical sensor modules, for which the current calibration scheme of the geometry by means of trilateration by light becomes challenging. As a promising alternative method, trilateration by acoustic signals is being developed. This system will consist of acoustic receivers incorporated inside the optical sensor modules, and stand-alone acoustic emitters. The working principle of the acoustic system will be verified and optimized at shorter distances in agreement with the optical signals during the IceCube-Upgrade. In this talk, we discuss the concept and design of the acoustic emitters.