Objectives
The scientific exploitation of the LHC (Large Hadron Collider), planned to start operation in 2008 will be the higher priority in high energy physics for the next coming years.
In the following step new large instruments will be required to reach a fine characterization of LHC discoveries, and analyse new phenomena around the TeV scale. The energy required (probably a few TeV), will be precised by the first results of the LHC, i.e. about 2010.