Limits of Conventional Techniques

D.E.S.Y. Abstract At present, the highest particle energies are reached ~ith synchrotrons and linear accelerators; the highest center of mass energies are produced in storage rings and linear col­ liders. The maximum energy of these devices is only limited by economical restrictions. For optimized machines,scaling la~s can be derived ~hich relate cost to energy. Advanced technologies such as superconducting magnets, supercon­ ducting rf resonators, ultra high po~er rf-sources etc. affect the constants in these scaling la~s.