(IMAGE 1) The superconducting coil consists of two pairs of helical coils and two sets of circular vertical magnetic field coils. In order to prevent the coil from moving or deforming due to the strong electromagnetic force acting on the superconducting coils, it is firmly supported by a supporting structure made of stainless steel with a high strength of 20 cm thick. These superconducting coils and supporting structures are cooled to cryogenic temperatures simultaneously.