Performance of a New IceTop Trigger in Simulations and in a Test Run

With elevated radio antennas planned to enhance IceTop, the surface array of the IceCube Neutrino Observatory at the South Pole, it will be possible to detect cosmic-ray air showers at larger inclinations. To increase the coincident detection of air shower with both IceTop's ice-Cherenkov tanks, we studied a new trigger for IceTop that uses sparse single tank hits which often occur in inclined air showers. The current standard trigger of IceTop requires pairs of ice-Cherenkov tanks in coincidence. A simulation study showed that inclusion of single tank hits in the trigger input results in a reduced energy threshold of the trigger and keeps it fully efficient up to higher zenith angles. A 24 hour test run of IceCube detector with the new trigger was recorded early September. In this talk, we present the result of the trigger simulation and the test run.