head 26 in contrast to the exemplary embodiment shown in fig3 the distance of the most remote part of the superconducting winding 50 c from the liquid helium is further removed meaning that heat must be transported over a greater distance to the liquid helium which is indicated by arrows 170 this can be achieved by an enlargement of the groove 102 of the winding 50 c or by the use of materials with higher heat conductivity fig9 shows a further alternative embodiment of the invention here no conduit is provided in the circumferential direction of the winding 50 d of the magnet 2 c instead the superconducting winding 50 d is directly thermally coupled to the reservoir 14 the reservoir 15 appropriately extends over the complete length of the magnet perpendicular to the plane of the drawing this can be seen in fig1 which shows a side view of a magnetic resonance apparatus here an even higher heat conductivity is required in comparison with the embodiments shown in fig3 and 8 alternatively a larger cross section of the coil body 4 can contribute to the heat transport fig1 shows a section through a magnetic resonance apparatus 40 a with a magnet 2 c according to the embodiment shown in fig9 the vacuum vessel 43 of the magnetic resonance apparatus 40 a is shown sectioned the radiation shield 42 likewise shown in section that surrounds the coil body 3 on which a number of superconducting windings 50 d of different diameter are.