DESIGN AND FABRICATION OF HIGHLY STABILIZED CLOSE-PACKED SUPERCONDUCTING SOLENOID

The highly stabilized superconducting solenoid has been fabricated suc cessfully by the dry winding method with the appropriate design of for mer and ground insulators. In this work the unexpected decrease of que nch current was remarked as the index of the instability in the superc onducting solenoids because it becomes a serious problem in practical application. The change of the contact condition between the former an d the winding was thought to induce the instability therefore the opti mization of the contact condition was tried. The former with high ther mal contraction and high rigidity and the ground insulator coated with the release film were selected for the solenoid design. It was found that the highly stable superconducting solenoids could be designed and fabricated by this selection.