A novel use of FFAGs in ERLs - In colliders: ERHIC, LHEC and a prototype at Cornell University*

We propose a novel use of Non Scaling Fixed Field Alternating Gradient beam line (NS-FFAG) to replace multiple beam lines in existing Energy Recovery Linacs (ERLs) (4-pass at Novosibirsk, ERL of CEBAF, ERL at KEK, etc.) with NS-FFAG beam lines connected with spreaders and combiners to the linac. We present two designs for the Electron Ion Colliders one at CERN-LHeC and one at Brookhaven National Laboratory-eRHIC to be placed in the tunnel of the existing Relativistic Heavy Ion Collider (RHIC) called eRHIC. The proof of principle electron accelerator with the NS-FFAG arcs is to be built at Cornell University Wilson Hall where there are already available injector, superconducting linac accelerator and the dump. There are very new developments in the NS-FFAG design never accomplished before: arc-to straight adiabatic matching with merged multiple orbits into one, permanent magnet design for the arc and straights with ability of four times in energy, etc.