Accelerating Muons to 2400 GeV/c with Dogbones Followed by Interleaved Fast Ramping Iron and Fixed Superconducting Magnets

The first acceleration stage for this muon collider scenario includes twenty passes through a single two GeV Linac. Teardrop shaped arcs of 1.8 Tesla fixed field magnets are used at each end of the Linac. This dogbone geometry minimizes muon decay losses because muons pass through shorter arcs when their gamma boost is low. Two 2200 meter radius hybrid rings of fixed superconducting magnets and iron magnets ramping at 200 Hz and 330 Hz are used as part of the second stage of muon acceleration. Muons are given 25 GeV of RF energy per orbit. Acceleration is from 250 GeV/c to 2400 GeV/c and requires a total of 86 orbits in both rings; 82% of the muons survive. The total power consumption of the iron dipoles is 4 megawatts. Stranded copper conductors and thin magnetic laminations are used to reduce power losses.