Recirculating linacs for a neutrino factory - Arc optics design and optimization

A conceptual lattice design for a muon accelerator based on recirculating l inacs (Nucl. Instr. and Meth. A 472 (2001) 499, these proceedings) is prese nted here. The challenge of accelerating and transporting a large phase spa ce of short-lived muons is answered here by presenting a proof-of-principle lattice design for a recirculating linac accelerator. It is the centerpiec e of a chain of accelerators consisting of a 3 GeV linac and two consecutiv e recirculating linear accelerators, which facilitates acceleration startin g after ionization cooling at 190 MeV/c and proceeding to 50 GeV. Beam tran sport issues for large-momentum-spread beams are accommodated by appropriat e lattice design choices. The resulting arc optics is further optimized wit h a sextupole correction to suppress chromatic effects contributing to the emittance dilution. The presented proof-of-principle design of the arc opti cs with horizontal separation of multi-pass beams can be extended to all pa sses in both recirculating linacs. (C) 2001 Elsevier Science B.V. All right s reserved.