Superconducting NMR resonators with macroscopically homogeneous superconductor distribution

A NMR (nuclear magnetic resonance) resonator system for emitting and/or receiving RF signals at one or more desired resonance frequencies to and/or from a measuring sample in an NMR apparatus investigational volume disposed about a coordinate origin (x,y,z=0), the NMR apparatus having means for producing a homogeneous magnetic field B0 in the direction of a z axis, the resonator system comprising:

• at least one RF (radio frequency) resonator having superconducting conductor structures which act inductively and, to a certain extent, also capacitively which are disposed between z=−|z1| and z=+|Z2| substantially on a surface which is translation-invariant (=z-invariant) in a z direction at a radial (x,y) separation from the measuring sample;
• and
• a compensation arrangement disposed on a z-invariant surface to extend to values of at least z<−|z1|−0.5|r| and z>+|z2|+0.5|r|, wherein |r| is a minimum separation between the measuring sample and said compensation arrangement, wherein said compensation arrangement has further superconducting conductor structures which are largely RF-decoupled from said RF resonator, said conductor structures of the compensation arrangement and of said RF resonator being composed of individual surface sections (“Z-structures”) which comprise superconducting structures disposed in said z-invariant surface to each extend across an entire length in said z direction of said conductor structures of said compensation arrangement and of said RF resonator and whose superconducting structures are disposed such that, with suitable conceptual decomposition of a surface of said Z structures into a plurality of small, equally sized surface elements and with conceptual application of a homogeneous test magnetic field along a surface normal of each surface element, a magnetic dipole moment of essentially a same strength would be induced in all those surface elements which differ only with respect to their z position.