Future Hadron super colliders: The farthest energy frontier

Advances in superconducting materials and magnets, in accelerator physics, and in beam feedback, control and instrumentation systems allow us to consider the practical design of a proton collider with a discovery potential well beyond that of the Large Hadron Collider (LHQ currently being constructed at CERN. The ELOISATRON (ELN) (or Very Large Hadron Collider (VLHC) represents what may well be the final step on the energy frontier of accelerator-based high energy physics. Despite the existence of detailed designs of the SSC (at 20 TeV per beam), more than 15 years of technical studies' for an ELOISATRON (ELN) at 100 TeV per beam, and an extensive study(2) of a Very Large Hadron Collider (VLHC) at FNAL, the economic practicality of a collider at 50 to 100 TeV per beam will remain uncertain until appropriate arc dipole designs have been tested in model magnet configurations. A vital step toward an affordable ELN is re search now underway aimed at the upgrade of the Large Hadron Collider (LHC) at CERN.