Magnetic moment arrangement calculation method for magnetic field adjustment, magnetic field adjustment device, and program

摘要

A magnetic field distribution of a predetermined evaluation region in a magnetic field generation apparatus having a magnetic field adjustment mechanism for adjusting a static magnetic field by arranging a magnetic moment is measured, and the measured magnetic field distribution and a predetermined target magnetic field of the evaluation region are measured. When calculating the error magnetic field distribution that is a difference from the intensity, and decomposing the error magnetic field distribution into components of each eigenmode of the magnetic field generated by the magnetic field generation device obtained by singular value decomposition, among the eigenmodes, By combining the correction of the low-order mode component and the correction of the high-order mode component, the arrangement of the magnetic moment that approximately corrects the error magnetic field distribution is calculated, and the low-order mode has a large singular value. It is an eigenmode group from the eigenmode number assigned to each eigenmode to the eigenmode number specified by the first threshold in the order of the higher order modes. A hearing eigenmode group, the correction amount of the components of the higher order modes, and is smaller than the correction amount of the components of the lower modes.