Performance of the insulation mock-up used alumino-silicate fiber composite for Bi-2212 Cable-in-Conduit Conductor

The process for Bi-2212 CICC is wind & react technology, which places very high demands on the temperature resistance of the insulation material. This study investigated the insulation structural properties of alumino-silicate fibers as insulation fibers. Initially, alumino-silicate fiber resin composites were fabricated and tested for tensile strength, interlaminar shear strength, and high voltage property. The results indicated that the alumino-silicate fiber resin composites possess relatively excellent mechanical and insulation properties. Subsequently, a mock-up, consisting of a 10 × 10 conductor array with a length of 1 meter, was constructed and subjected to a series of tests, including thermal cycling, DC, AC, and Paschen tests, adhering to ITER PF6 specifications. The results demonstrate that the mock-up meets the required criteria for both DC and AC performance. However, in the Paschen test, it exhibits a relatively low breakdown voltage, indicating areas for further optimization.