Accelerators: limitations of technology

Hadron colliders and accelerators in the 20 TeV energy range turned out to be the major interest among active members of the Accelerator Row Group. While other types of accelerator and other energy ranges were discussed, largely on the basis of work done elsewhere, primary creative activities at this summer study focused on the hadron facility. Both the economic and accelerator physics dimensions of such a facility were examined. The central challenges for an R/D program appear to be: 1) achievement of virtual automation of superconducting magnet, accelerator housing and other accelerator component manufacture and installation; 2) achievement of a thorough understanding of the field vs. cost relation for superconducting magnets; and 3) achievement of a thorough understanding of the luminosity-aperture-energy relation