AbstractIn order to fabricate the helical coil for the Large Helical Device, the apparent rigidity and deformation properties of the coil should be measured experimentally. Therefore, a compressive mechanical testing method for the superconducting coil pack stimulated for the helical coil was proposed and the compressive rigidity test has been carried out at cryogenic temperature.From the results, the following matters were clarified: 1.(1) The compressive mechanical testing method for a large test object at cryogenic temperature was established, and at the same time, test control systems including the cryogenic system were performed in good condition.2.(2) As the coil pack consisted of 4 × 4 superconductors and GFRP spacers, the spacers for the electric insulation moved to suitable positions for an effective transformation of the compressive load on the first loading process, and this resulted in yielding a large hysteresis curve in the compressive load and the displacement relationship.3.(3) The apparent rigidity of the coil pack tested in this test program was measured to be about 19 GPa on the unloading process.
Design and construction of the helical R&D coil (TOKI-HB)