Patent ID: 8154292
Filing Date: 2012-04-10
Classification: G01R

Abstract:
1. An apparatus for carrying out DNP-NMR measurements on a sample, the apparatus comprising: a magnet configuration for producing a magnetic field in a first working volume, said magnet configuration also producing a stray field in a second working volume in a direction of an axis with at least one first magnetic field gradient of first or higher order in said direction of said axis, wherein said axis extends through said second working volume; a device for measuring MR signals of the sample from said first working volume; a DNP excitation device for DNP excitation of the sample in said second working volume; a positioning mechanism for transferring the sample between said second working volume and said first working volume; and a compensation configuration made of magnetic material and disposed near said second working volume, wherein, in an operating condition of said magnet configuration, said compensation configuration produces at least one second magnetic field gradient of first order or higher order in said direction of said axis in said second working volume that is between −90% and −110% of said first magnetic field gradient of a same order of said stray field of said magnet configuration in said direction of said axis in said second working volume.