Abstract
It is revealed that much heat is generated not only by the eddy current due to the relative displacement between the conducting elements in the magnet, but also by the mechanical vibrating deformation of a superconducting coil. We measured the characteristics of heating by the mechanically vibrating superconducting coil in resonance using the oil servo actuator. As a result of these experiments, the following facts are made clear: (1) The heat generated in a vibrating superconducting coil is larger in the twisting configuration than in the bending one under the vibrating mode. (2) The characteristics of the increment in heating in the vibrating coil under the energizing and the de-energizing state were almost the same. We cite as the factor in heating phenomena of the mechanical excitation the frictional heat between the fasteners and a superconducting coil. And the size of the displacements in these frictional parts are supposed to be the order of several micrometers. We intend to make further analysis of the factor of heating from now on.
