• K. Ruwali
  Sokendai, Ibaraki
• K. Hosoyama, K. Nakanishi
  KEK, Ibaraki
• Y. Teramoto, A. Yamanaka
  Toyobo Research Institute, Shiga

Main cause of premature quench in superconducting magnet is the heat generated due to　sudden superconducting wire motion. The wire motion occurs where electromagnetic force to conductors exceeds frictional force on surfaces of the conductors. Hence, frictional properties of the conductors and winding structures are important parameters for characterizing stability of the superconducting windings. Experiments were carried out to detect the superconducting wire motion under the influence of varying electromagnetic force. The wire movement is detected by observing the spike in voltage of the superconducting sample wire. From the time profile of voltage spike, distance moved by superconducting wire is estimated. Insulating material such as Dyneema random sheet, Dyneema non-woven sheet and Dyneema fiber cloth were used at the interface of superconducting wire and base material. Dyneema has low frictional coefficient and negative thermal expansion. The experimental findings will be discussed.