A high-temperature superconductor (HTS) coil includes a coil winding with a superconducting material and a coil former for carrying the coil winding. When the high-temperature supercon-ductor (HTS) coil cools down from a room temperature to an operating temperature, the coil winding or the coil former counteract a thermal shrinkage of the coil winding in order to avoid or reduce a longitudinal compression of the superconducting material of the coil winding.