ISABELLE Ring Magnets

Data are presented to establish the operating characteristics of the proposed ISABELLE Ring Magnets. The harmonic content of both the straight section and ends of the magnets was measured as a function of magnetic field with the correction coils energized or disconnected. The magnets are single layer\cos N\thetaturns distribution superconducting saddle coils with 'cold' iron shields. The data presented also include quench performance of magnets vs the critical current performance of the wire strands; the rate effect on the harmonic content of the field; the magnetization loss of the magnets; magnetic length; magnetic field vs current/turn; and magnetic field external to the iron shield. The maximum performances of the dipoles and quadrupoles are 4.9 T and 4.6 T (bore field 2-D) with a design requirement of 3.93 T and 3.28 T respectively. Magnets of both types have exceeded the design field on the first quench. The field characteristics are well within the present design requirements for ISABELLE.