A magnet system for the time projection chamber at PEP

A superconducting solenoid with a conductive bore tube is under construction for use with the time projection chamber (TPC) detector at PEP. It will be a uniform induction of 1.5 T over a 6.3 m³volume. Its stored energy will be 11 MJ while maintaining a radiation thickness of 0.3 radiation lengths for the coil package. The coil will operate at a current density of 7 × 10⁸Am^-2and it will be cooled by force flow two phase helium in a tube. The final design details are given here.