Design and Fabrication of NbTi Coils for a Superconducting Wavelength Shifter

A Superconducting Wavelength Shifter (SWLS) capable of achieving a peak magnetic field of 6.6 T is currently being designed for a future hard X-ray beamline of Sirius, the new Brazilian Light Source. Due to the machine requirements, a narrow field profile in the central pole region (FWHM < 30 mm) is a constraint to the electromagnetic design. The superconducting racetrack coils, made of NbTi wires, are being designed to be conduction cooled with an operating margin above 20% at 5 K. Two designs are required, the lateral coils with 180 turns and the central coils with 1080 turns, both wound layer by layer with fiberglass insulation and then vacuum impregnated with epoxy resin. The proposed coils design and fabrication route will be presented, as well as the proposed setup for testing them.