Design and test of superconducting beamline dipole magnets

Two prototype superconducting beamline dipoles have been designed, fabricated, and tested. Each has an oval-shaped bore 0.095 m × 0.146 m and has an active length of about 1 m. The windings were impregnated with epoxy under vacuum and assembled on a heavy walled bore tube which provided structural support in combination with a stainless steel wire structural banding. The total amount of structural banding utilized was the major difference between magnets. The design for the magnets is described together with test results. Performance was essentially identical with each magnet requiring 14 quenches to surpass the air core central field design point of 2.5 Wb/m
²
. Voltage distributions within the magnets during the quenching process were measured and controlled through utilization of a system of protective resistors. Measured results with and without the protective circuitry are given as well as calculated transients based on a simplified model.