PURPOSE: To prevent the temperature rise of a superconducting coil due to a disturbance and to obtain the superconducting coil whose quenching prevention effect is high by a method wherein a heat-conducting sheet which is provided with both characteristics of an electrically insulating property and a highly heat-conducting property is inserted between superconducting wires in such a way that its end part comes into contact with a cooling medium between layers of coil windings.
CONSTITUTION: A coil formed by laminating superconducting wires 2 is immersed in a cooling medium such as liquid nitrogen, liquid helium or the like; and a superconducting magnet is formed. At the superconducting coil, a heat-conducting sheet 4 which is provided with both characteristics of an electrically insulating property and a highly heat-conducting property is inserted between said superconducting wires 2 in such a way that its end part comes into contact with said cooling medium between layers of coil windings 3. For example, as said heat-conducting sheet 4, (a sheet wherein fine particles of a highly heat-conducting ceramic having a thermal conductivity of 260W/mk or higher is mixed with a Teflon resin so as to make its thermal conductivity high by several times as compared with ordinary insulating sheets) or (a sheet wherein a thin sheet or a foil of copper or aluminum as a metal material whose thermal conductivity is large is coated with an insulating material) is sandwiched between superconducting wires 3 in individual layers.
SATO YASUSHI
MORIHARA ATSUSHI
OUCHI KAZUNORI
TOMINAKA TOSHIJI
