VPI FOR LONG MODEL OF SUPERCONDUCTING MAGNETS COIL AND ITS CRYOGENIC MECHANICAL PROPERTY

The feasibility of VPI（Vacuum Pressure Impregnation） of superconducting magnet coils of HT-7U is testified by VPI experiment of long model. The section of the model is same as that of real coils. The parameters of vacuity and pressure are analyzed, which is the basis of the VPI technology of the magnet coils. The cryogenic mechanical property of sample that is made from the cured insulating layer of the long model is tested.