Abstract
The superconducting AC power applications have been actively investigated in these days. In order to develop AC superconducting power apparatus, it is necessary for developing 10kA-1T class AC superconducting magnet as a fundmental technology. From such a viewpoint, the authors have been investigating AC superconducting coils which have a large AC transport current capacity.
In this paper, the specification and experimental results of the experimental 1kA-1T class AC superconducting coil which has been fabricated as a first step for developing AC superconducting power apparatus are shown. Two experimental AC coils whose conductors are the sub-cable and single strand of the 1kA-1T class AC superconducting coil conductor are also fabricated and tested to investigate the stability of AC superconducting coils.
The quench current of these 3 AC coils are measured and are compared to the DC critical current characteristics of the strand. From the result of the comparison, it is confirmed that the AC quench current of each superconducting coil is close to the DC quench current, and is also close to the current which is determined by the critical current characteristics defined by 0.1μV/cm criterion. Furthermore, it is confirmed that the quench point of the developed AC coil reaches to 288A(peak)-1.396T(peak).
