Status and first results of the Tunka Radio Extension
Tunka-Rex is a new radio detector for extensive air showers from cosmic rays, built in 2012 as an extension to Tunka-133. The latter is a non-imaging air-Cherenkov detector, located near lake Baikal, Siberia. With its 25 radio antennas, Tunka-Rex extends over 1 km2 with a spacing of 200 m and therefore is expected to be sensitive to an primary energy range of 1017–1018 eV. Using Trigger and DAQ from Tunka-133, this setup allows for a hybrid analysis with the air-Cherenkov and radio technique combined. The main goal of Tunka-Rex is to investigate the achievable precision in reconstruction of energy and composition of the primary cosmic rays by cross-calibrating to the well understood air-Cherenkov detector. An early analysis proves the detection of air-shower events with dependencies on energy and incoming direction as expected from a dominant geomagnetic emission mechanism.
