COOLING OF SUPERCONDUCTIVE MAGNET BY SUPERFLUID HELIUM

摘要

PURPOSE:To effectively cool a superconductive magnet and generate high magnetic field by providing a cavity in the course of the flowing path of superfluid He at the inside of cooling body of superconductive magnet. CONSTITUTION:A superconductive magnet A is formed by stacking in several layers a coil C formed by winding a conductive lead wire in the constant diameter R and a constant thickness through the waving disks 2 formed like doughnuts. A desirable number of recesses 3 for cavity are formed at the desired area on the disk 2 of this magnet A. According to this structure, on the occasion of cooling the magnet A by the overcooling superfluid He used as the coolant, if heat is abruptly generated within the magnet A, such heat can be absorbed by a large amount of overcooling fluid He within the recess 3. Thereby, the magnet A is efficiently cooled and provides high magnetic field and a more stable superconductive magnet can be obtained with a high thermal conductivity of superfluid He.