Abstract
A 0.88 T Nb-Ti superconducting undulator with a period length of 16 mm and a period number of 50 is proposed recently at SSRF. The magnetic field simulation shows that it is possible to obtain a peak field of 0.88 T on the beam axis at a magnetic gap of 8 mm. And two coil formers of five periods have been machined from SAE1018 stainless steel and sputtered with thin TiO2 film for insulation. One coil former has been wound with copper wires and impregnated with epoxy resins, and the other has been wound using Nb-Ti/Cu wires, impregnated and tested. The dimension of the grooves of the coil windings is 5 mm × 12 mm. Formvar insulated Nb-Ti/Cu superconducting wires with a diameter of 0.6 mm are used to wind the coils. Experimental results show that the critical current of the coil could reach as high as 312 A at 2.5 T, 88% of the critical current of short Nb-Ti/Cu samples from the same bunch, which means the coil winding and impregnation crafts employed could meet the requirement of the 0.88 T Nb-Ti superconducting undulator.
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