Coil with superconductive windings cooled without cryogenic fluids

A coil, comprising;

• a set of windings with a generally annular shape and formed by a plurality of series-connected partial windings made of a superconductor with a high critical temperature, in which said partial windings are arranged next to each other in stratified form,
• at least one cooling sheet which is made of thermally conductive material and arranged in contact with said set of windings and which is designed to be connected in a thermally conductive manner to a cryogenic cooling system,
• a support structure having a pair of end plates arranged on opposite sides of the coil, able to enclose in sandwich form said partial windings and said at least one cooling sheet so as to keep them mechanically in contact with each other, and
• a vacuum chamber which contains said set of windings and support structure, said support structure being secured to a wall of the vacuum chamber via a plurality of articulated supports arranged along the external circumference of the end plate furthest from the wall of the vacuum chamber, whose ends are hinged with the end plate of the support structure of the coil and the wall of the vacuum chamber, respectively, each articulated support having a freedom of rotation in a respective radial plane with respect to the coil.