Synchrotron radiation dominated hadron colliders

Abstract

The synchrotron radiation damping time becomes small compared to the beam lifetime when the beam energy in a circular hadron collider reaches about 100 TeV and the dipole field about 10 T. This paper discusses an approach to the design of these colliders such that the desired performance parameters, e.g. beam-beam tune shift and luminosity are achieved at the equilibrium values of the beam emittance and momentum spread. The design procedure is described, involving the design of the interaction regions, the arcs, and the RF system. The thresholds and/or growth rates of several collective effects, and the growth times for intra-beam scattering are estimated. The consequences of the synchrotron radiation are discussed in the conclusions.