| 摘要 |
PURPOSE:To realize both the extraction of a magnetic-field gradient and the acquisition of vector information with high accuracy in a small space by winding wires made of superconductors in each specific groove respectively. CONSTITUTION:First or third grooves 21-23 are formed the outer circumferential surface of a cylindrical bobbin 1. The first groove 21 is formed along a plane (p) having an angle of approximately 54.736 deg. to a base P as a plane orthogonal to the central axis L of the cylindrical bobbin 1. The second and third grooves 22 and 23 are formed at positions, where the first groove 21 is tuned at 120 deg. in the mutually reverse directions while using the central axis L of the cylindrical bobbin 1 as the axis of rotation symmetry. Wires 31-33 made of a superconductor such as an Nb-Ti alloy are buried in the first or third grooves 21-23 respectively, separate twist pair is formed respectively at both tips of each superconductor wire 31-33, and the both tips of the wires 31-33 are introduced outside the bobbin 1 through the insides of grooves 11-13 for the twist pairs formed on the outer circumferential surface of the cylindrical bobbin 1. |
