Overview and Electronics Needs of ATLAS and CMS High Luminosity Upgrades

The LHC will begin collisions in Spring 2009, and build up to nominal luminosity (1.0 × 10^34 cm^?2 s^?1 over the next few years. This will be followed by a continuos programme of im- provements leading eventually to a ten-fold increase above nom- inal with the super-LHC (sLHC). Within a few years of opera- tion, the LHC experiments should discover or rule out a Stan- dard Model (SM) Higgs, and could find supersymmetric parti- cles if they exist below about 1.5 TeV mass. Several other dis- coveries are possible. However detailed knowledge of any new particles will be needed to understand exactly what the physics behind them is. Large data sets will be needed for this; these will also allow the mass limits for discovery of new particles to be increased. Upgrades to the general purpose experiments ATLAS and CMS will be needed to deliver these large data sets with good performance. This paper presents some of the physics goals of the upgrade, LHC machine plans, the schedule, and summarises the changes and challenges for the detectors at the sLHC.