2-DIMENSIONAL MAGNETIC SENSITIVITY TO ASYMMETRIC AND SYMMETRICAL DEVIATIONS FOR SSC QUADRUPOLE MAGNETS

The magnetic multipole sensitivity to asymmetric and symmetric deviati ons is analyzed in the two-dimensional cross-section of SSC quadrupole magnets. Deviations in the 2-D cross-section caused by variations in the superconducting cable locations due to changes in the thickness of the pole sheet, mid plane insulation, inter-layer spacer, backing she et, and copper wedges have direct impact on the magnetic field gradien t and multipoles in the straight section of the magnets. Asymmetric de viations due to different coil sizes in a cross-section are also analy zed. The analyses are performed mainly with the software package AHARM [1]. SSCMAG[1] and finite element software PE2D[2] were also used to o btain baselines and to verify the results. The results provide informa tion essential to an understanding of the deviations of the multipoles resulting from manufacturing processes, and suggest possibilities for tuning the multipoles to meet the magnetic requirements.