General Procedure for Fabricating a High-Temperature Superconducting (HTS) Magnet Coil

Mandrel Preparation

Segments of copper pipe (40–50 mm in length) are cut using a rotary pipe cutter. The cut sections are sanded to remove burrs and oxidation before being coated with a thin layer of solder to enhance adhesion.

Coil Winding

Solder paste is applied evenly around the mandrel to facilitate bonding. The superconducting tape is carefully wound onto the mandrel with its superconducting side facing inward. Particular attention is given to ensuring uniform tape height and consistent winding tension to minimize irregularities.

Lead Preparation and Attachment

Two lead segments of HTS tape are cut to the required length. These are sanded, cleaned with ethanol, and subsequently coated with solder. Each lead is co-wound for one full turn, ensuring that the superconducting surfaces remain in direct contact with the main coil lead. The three lead sections are then secured together using copper tape. This procedure is repeated for the second terminal.

Final Assembly and Thermal Treatment

The coil is enclosed using a pipe clip and uniformly coated in solder to secure the structure. Excess solder is removed from the leads to prevent unintended shorting. The assembled coil is subjected to a thermal treatment at 185°C for 20 minutes, after which it is allowed to cool before the pipe clip is removed.