Radiation and induced activation at high luminosity

The effects on radiation levels and background rates of an increase of the luminosity at the LHC from 10^34 to 10^35 cm^-2 s^-1 have been studied. Induced activation will be a large problem for ATLAS already at nominal luminosity and at higher luminosities the maintenance of the ATLAS detectors could be severely restricted. A change of material in the beampipe from stainless steel to beryllium would reduce the activation of the beampipe by three orders of magnitude. A change to a beryllium beampipe would also significantly lower the background rates in the muon spectrometer. Several new shielding scenarios have been simulated but there is no simple improvement of the shielding that would give a large reduction in muon background rates. Even drastic and very costly changes to the shielding will not reduce the background rates by more than a factor of three.