Development of Superconducting Wiggler at NIRS

A wiggler with three-pole is under development. Coils of the central pole and the auxiliary poles were wound with superconducting wires of Nb3Sn and NbTi, respectively. Only a cryocooler without liquid helium refrigerates the coils. The various tests such as a cooling test, a quench test and the measurement of a magnetic field were carried out. The field of the central pole achieved about 7 T. The magnetic field distribution was measured with Hall proves along the central line of the beam duct. As the results of these tests, it was found that it is almost according to its design.