Patent ID: 7990661
Filing Date: 2011-08-02
Classification: G01R,H01F

Abstract:
1. An active shield superconducting electromagnet apparatus comprising: a main switching circuit including a first main coil, a second main coil, a first shield coil, a second shield coil, and a first superconducting persistent current switch, which are connected in series, the second main coil having the same excitation direction as that of the first main coil, and the first shield coil and the second shield coil having an excitation direction reverse to that of the first main coil; a sub switching circuit including a bypass circuit which is connected to a series circuit of the first main coil and the second main coil, or to a series circuit of the first shield coil and the second shield coil, in parallel, a first closed circuit including at least one of the first main coil and the first shield coil, and a first quench protection circuit, which are connected in series, a second closed circuit including at least one of the second main coil and the second shield coil, and a second quench protection circuit, which are connected in series, wherein the first main coil, the second main coil, the first shield coil, and the second shield coil have the same axis, and are arranged on the axis in order of the first shield coil, the first main coil, the second main coil, and the second shield coil, and wherein each of the coils are connected in series in order of the first shield coil, the second main coil, the first main coil, and the second shield coil.