A superconducting probehead applicable for nuclear magnetic resonance microscopy at 7 T

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Abstract
A practical cryogenic probehead for NMR microscopy is described. The superconducting coil is composed of a YBa 2 Cu 3 O 7 layer on a LaAlO 3 substrate. The probehead consists of a continuous flow cryostate with a room temperature bore for the sample. For better performance the sample can be positioned in the center of the coil. To evaluate the gain in sensitivity, spin-echoimages are presented which compare the YBa 2 Cu 3 O 7 (YBCO) resonator to a room temperature and a cryogenicCu resonator. These results are corroborated through theoretical calculations. To estimate the potential of superconducting coils for NMR microscopy we have made a theoretical comparison of an YBCO resonator with a microscopic solenoid with three winding.