Magnets for the ZGS superconducting stretcher ring

Dipoles and quadrupoles have been developed for use in a 12.5 GeV storage ring at the ZGS. The winding bore of these magnets is 10.16 cm with a useful aperture of 7.6 cm. The magnets produce a high quality field (±0.1% nonuniformity including the ends) that requires no correction at any field level. An operating current of 190 A at the design field of 30 kG allows the use of a very low heat leak cryostat design. A 3 meter length of magnets is expected to require only 2 liters helium per hour. Construction of 5 prototype modules, consisting of 2 dipoles and 2 quadrupole each, complete with cryostats, is almost completed.