The large superconducting solenoids for the g-2 muon storage ring

Brookhaven National Laboratory is building four superconducting solenoids for use in a planned muon storage ring for improving the accuracy of muon magnetic moment measurements to 0.35 ppm. In the storage ring, two 24-turn inner solenoids and two 24-turn outer solenoids will be placed at opposite polarity to generate a dipole field. The four, which are indirectly cooled by two-phase helium, have a rated current of 5,300 A and stored energy of 5.5 MJ.