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Description
REBCO tapes stand out as the most promising conductors for a large variety of applications yet being still far from being fully understood on both the theoretical and experimental sides.
For this purpose, within the PNRR-IRIS project currently at its final phase, a 10 T cryogen free dipole magnet demonstrator fully built with HTS has been designed and is being manufactured, namely ESMA (Energy Saving Magnet for Accelerators).
To keep up with the development of ESMA, as well as to enhance the understanding of the tape in real winding applications aimed at future particle accelerators, an experimental campaign is being carried out. This campaign focuses on validating the conductor behaviour and performance using a 12 mm Faraday Factory Japan (FFJ) REBCO tape through small sample measurements and small coil winding and testing in LN2.
For this aim, a series of racetrack coils have been designed, with an eye on repeatability, produced and tested in LN2. The tests include charging and discharging the coil at different rates, transition measurements to the Normal Conducting (NC) state, and overcurrent powering. All tests were performed multiple times and over several cooldown and warm up. Measurement results have been collected using various distributed sensors, including voltage taps, Hall probes, and temperature sensors.
The expected margins and central field of the windings have then been calculated and compared with experimental data. These results, along with the design and manufacturing details of the racetrack coil, are going to be described and discussed throughout the article.
