A nuclear magnetic resonance apparatus for generating a homogeneous static magnetic field in the z-direction, comprising a coil/resonator system, a gradient system, and a shielding configuration which is positioned radially between the coil/resonator system and the gradient system, wherein the shielding configuration comprises an electrically conducting layer with a slot, wherein the electrically conducting layer is disposed about the center of the shielding configuration to be axially symmetrical with respect to the z-axis, is characterized in that, in an axial section z1L, containing at least 90% of the magnetic field energy of the coil/resonator system, the shielding configuration comprises at least one pair of regions which have a cylinder envelope shape, wherein the regions of each pair are each defined by two respectively closed limiting lines circulating about the z-axis, and wherein the two limiting lines of each region have a mutual axial separation a .ltoreq. z .times. .times. 2 - z .times. .times. 1 2 from each other and are disposed on planes parallel to the xy plane, wherein the regions are geometrically positioned in such a manner that they have opposite inductive couplings for part of the eigenmodes of the shielding configuration. In this manner, coupling of energy from the resonator/coil system into the shielding configuration is prevented or minimized.