  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.

High Energy Physics - Experiment