| 摘要 |
PURPOSE:To lead an extremely strong magnetic flux to an application region by a method wherein the magnetic flux flowing from a generation device passes through the inside of a tubular material and is led to a magnetic-field generation device and a separate magnetic route is formed. CONSTITUTION:A tubular material 1 forms a magnetic route which passes through a necessary point; e.g., the tubular material is shaped in such a way that a closed tubular material drawing a rectangular loop is cut halfway and that the cut part is removed. Both openings at a stating end and a closing end are arranged in such a way that they face both openings of a solenoid; by this setup, a closed magnetic circuit including a magnetic-field generation device is formed. When the tubular material 1 of a superconducting material is arranged in this manner, a distribution of a magnetic field is confined to the inside of the tubular material 1 due to the Meissner effect which the superconducting material displays; the magnetic flux generated at an air-core coil 2 is guided to a magnetic-field application region without being leaked to the outside; the tubular material 1 functions as a so-called magnetism-guiding tube with reference to the magnetic flux in the same manner as a wave-guide for an electromagnetic wave. The magnetic field from the magnetic-field generation device is led to a magnetic route which is different from an initial magnetic route which is composed of the magnetic route inside the tubular material 1. |
