Superconducting Magnets for use inside the HERA ep Interaction Regions,” PAC

For the HERA luminosity upgrade, superconducting magnets will be inserted inside the existing H1 and ZEUS experimental detectors. These magnets enable earlier separation of the electron and proton colliding beams than the original HERA design and provide additional interac-tion region (IR) focusing. Design and production of such magnets is challenging due to detector space limitations, interaction with detector solenoidal fields, large inner synchrotron radiation apertures and stringent field quality requirements. We plan to direct wind ≈1 mm cable in di-pole, quadrupole, skew dipole and skew quadrupole cir-cuits as discussed in this paper. Recent magnetic field measurements of a short prototype magnet, for quantify-ing ramp rate effects, are also presented here.