Crystal Ball : On the Future High Energy Colliders

Abstract

High energy particle colliders have been in the forefront of particle physics for more than three decades. At present the near term US, European and international strategies of the particle physics community are centered on full exploitation of the physics potential of the Large Hadron Collider (LHC) through its high-luminosity upgrade (HL-LHC). A number of next generation collider facilities have been proposed and are currently under consideration for the medium-and far-future of the accelerator-based high energy physics. In this paper we offer a uniform approach to evaluation of various accelerators based on the feasibility of their energy reach, performance reach and cost range. We briefly review such post-LHC options as linear e+e-colliders in Japan (ILC) or at CERN (CLIC), muon collider, and circular lepton or hadron colliders in China (CepC/SppC) and Europe (FCC). We conclude with a look into ultimate energy reach accelerators based on plasmas and crystals, and some perspectives for the far future of accelerator-based particle physics.

High transformer ratio of multi-channel dielectric wakefield structures

“…Figure 1: examples of some dielectric-lined wakefield accelerating structures Other than high accelerating gradients, a DWA should have a suitably high transformer ratio (T) so as to minimize the number of drive beam segments needed to achieve a given final test beam energy. The cost of such an accelerator tends to scale as T -1/2 [13]. To extract the energy from the drive bunch system, all bunches also must travel in a stable manner.…”