  Two 2200m radius hybrid rings of fixed superconducting magnets and iron
magnets ramping at 200 Hz and 330 Hz are used to accelerate muons. 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 Metglas laminations are used to reduce
power losses.
