Normally conducting NMR resonators with macroscopically homogeneous distribution of the conducting material

Abstract

An NMR resonator with RF resonator for receiving RF signals at a resonance frequency from a measuring sample in a volume under investigation of an NMR apparatus with a means for producing a homogeneous magnetic field B0 in the direction of a z axis, wherein normally conducting conductor structures of the RF resonator which act inductively and partially also capacitively are disposed between z=−|z1| and z=+|z2| on a surface which is translation-invariant (=z-invariant) in the z direction at a radial (x, y) separation from the measuring sample, is characterized in that a compensation arrangement is additionally provided on the z-invariant surface, which extends to values of at least z<−|z1|−0.5|r| and z>+|z2|+0.5|r|, wherein |r| is the minimum separation between the measuring sample and the compensation arrangement, wherein the compensation arrangement comprises additional normally conducting conductor structures which are largely RF-decoupled from the RF resonator, with the conductor structures of the compensation arrangement and of the RF resonator being composed of individual surface sections (“Z-structures”) which comprise normally conducting structures and which are disposed in the z-invariant surface to each extend in the z direction along the entire length of the conductor structures of the compensation arrangement and of the RF resonator, their structures being disposed such that, under decomposition of the surface of the Z structures into a plurality of equally sized surface elements, an equal mass of normally conducting material is contained in all surface elements which differ only with respect to their z position. This produces a new type of normally conducting NMR resonators whose additional conductor structures are decoupled from the actual RF resonator and which compensate for the disturbing influence caused by the susceptibility of the conductor.

Dependencies are inferred from the claim text.