Patent ID: 9075120
Filing Date: 2015-07-07
Classification: G01R

Abstract:
1. A shim coil control device that compensates stability and homogeneity of a magnetic field of a superconducting magnet with a shim coil, wherein the shin coil control device comprises a computer programmed to output a signal to a shim coil driving device for controlling at least one term of the shim, and wherein the shim coil control device is programmed to provide (1) a shin setting recorder that records, when the setting of the shim is conducted: by associating each setting with an index n as (w n , u n , s n , t n ), wherein the index n is a value of 0 to N−1, where the number of times of setting is N, and the value of index n associated with the setting finally conducted is N−1; (2) generating compensation function supply that supplies a preset generating compensation function f (3) compensation value calculator that refers to the generating compensation function supply and the shim setting recorder, and calculates a compensation value at the time t by the aid of a compensation function g(t) that is a function of the time t which is expressed as g(t)=Σf (4) an output value computer that computes a compensation value u′ by adding the compensation value obtained by the compensation value calculator and a latest set value u