We report on the test of a small scale, non-planar coil using non-insulated ReBCO tape wound on a 3D-printed aluminum support structure. A 3D-scan of the winding frame which was printed out of AlSi10Mg using selective laser melting, showed peak manufacturing deviations of 0.3 mm. We tested the coil with 21 turns of 3 mm wide tape cooled both by liquid nitrogen and with a cryocooler. We achieved a central field strength of up to 21 mT which agrees with the prediction suggesting that we manufactured the coil without defects. The peak field was reached at a supply current of 120 A. The current leads showed a contact resistance of (2.25±0.13)μΩ. The discharge time L/R was found to be 0.63 s in liquid nitrogen and 2.92 s when cooled by the cryocooler. From this we estimate a winding pack temperature of 41 K.
@article{arxiv.2505.08488,
title = {A Non-planar ReBCO Test Coil with 3D-printed Aluminum Support Structure for the EPOS Stellarator},
author = {Paul Huslage and Tristan Schuler and Pedro F. Gil and Vitali Brack and Dylan Schmeling and Diego A. R. Orona and Elisabeth von Schoenberg and Timo Thun and Jason. Smoniewski and Eve V. Stenson},
journal= {arXiv preprint arXiv:2505.08488},
year = {2025}
}