IceTop - Cosmic Ray Physics with IceCube
  The IceCube experiment at South Pole consists of two detector components - the IceTop air shower array on the surface and the neutrino telescope at depths from 1450 m to 2450 m below. Currently, 26 IceTop stations and 22 InIce strings are deployed. With the present size of the IceTop array, it is possible to measure cosmic rays with energies ranging from 0.5 to 100 PeV. Coincident events between the IceTop and the InIce detector provide useful cross-checks of the detector performance and furthermore make it possible to study the cosmic-ray composition. This paper gives an overview on the current status of IceTop. 
Tilo Waldenmaier