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The Superconducting Magnet Group of the Institute High Energy Physics, Chinese Academy of Sciences, is investigating a dipole magnet fabricated with Nb3Sn and HTS to achieve a field of 15-20 T or even more higher. A compact high current carrying compacity and low AC loss ReBCO cable (X-cable) is developed for the insert HTS coil. The structure of the cable is similar to the original Roebel cable, but is implemented by in-plane bent ReBCO stacks. The concept of X-cable has been proposed in 2016 by IHEP. The first 10 m prototype cable has been successfully fabricated in 2020. It is delightful that the experimental results of the prototype cable demonstrate the feasibility of the cable design and cabling process. Based on the test results of the prototype cable and design parameters of the insert HTS coli, the first full-scale X-cable has been successfully fabricated in 2023 on a production line. The transposition period length of the cable is more than halved compared to the prototype X-cable, which will further reduce the AC loss of the cable and make the current distribution more uniform. In this work, a 2D model is used to analyse the effect of transposition length on the current distribution of the cable. Meanwhile, a 1 m full-scale X-cable is tested in liquid nitrogen, the voltage at each ReBCO tape contained in the cable and the voltage at different position of the copper terminals are real-time monitored during the whole test. The experimental and simulation results demonstrate that the quality of the termination made in this work is relatively good, and the critical current of the cable reaches 2019.1 A.
