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Following the CHART/PSI roadmap toward insulated REBCO-based high-field magnets, and after the completion of the first REBCO Subscale magnet (RS1), we aim to design a subscale demonstrator for a double-aperture high-field magnet featuring field alignment between the wide face of the cable and the magnetic field. The objective of this development is a reduction of field errors and ramp losses, wrt. To the standard common-coil configuration of RS1. This coil configuration would be compatible with tape-stack cable as well as Roebel cable. The latter cable would benefit from the large bending radius of the common coil as compared to a cosine theta and block coil [1], [2].
To avoid critical-current reduction due to mechanical strain, the coil configuration minimizes hard-way bending of the tapes. Although this work focuses on the electromagnetic design, several considerations informed by the RS1 experience at PSI are included to incorporate the stress-management concept into this coil configuration, which may be necessary for high-field dipoles. To assess the electromagnetic scalability of this concept toward high-field accelerator magnets, a preliminary 14 T configuration is also presented.
Finally, an energy-extraction–based protection study at 4.5 K and 20 K is presented to help determine the cable parameters, namely the number of tapes and the Cu/non-Cu fraction.
Acknowledgement: This work was performed under the auspices of and with support from the Swiss Accelerator Research and Technology (CHART). This work received financial support from and contributed to the HFM Programme, hosted at CERN.
[1] G. A. Kirby et al., “First Cold Powering Test of REBCO Roebel Wound Coil for the EuCARD2 Future Magnet Development Project,” IEEE Trans. Appl. Supercond., vol. 27, no. 4, pp. 1–7, Jun. 2017, doi: 10.1109/TASC.2017.2653204.
[2] M. Durante, C. Lorin, T. Lecrevisse, M. Segreti, G. Kirby, and J. Van Nugteren, “Manufacturing of the EuCARD2 Roebel-Based Cos-Theta Coils at CEA Saclay,” IEEE Trans. Appl. Supercond., vol. 30, no. 4, pp. 1–5, Jun. 2020, doi: 10.1109/TASC.2020.2978788.
