Towards a New IceTop Trigger for Inclined Cosmic Rays*

IceTop, the surface component of IceCube Neutrino Observatory at the South Pole, is a cosmic-ray air shower detector comprised of an array of ice-Cherenkov tanks. An enhancement of the surface array is planned to recover the sensitivity lost by snow accumulation over the years. Part of that enhancement are radio antenna, which will increase the measurement accuracy of the electromagnetic component of air showers and are particularly sensitive to inclined showers. Next to increasing the sky coverage and total statistics for other studies such as the measurement of cosmic-ray anisotropy and of the cosmic-ray mass composition, this is one motivation to lower the trigger threshold of IceTop. For these reasons, we have studied a potential new trigger for IceTop which is optimized for inclined shower using CORSIKA simulation as well as periodic readouts of the full IceTop array. In this talk, we will present our plans and progress on the development of this new trigger.