The invention relates to a method for charging a superconductor bulk magnet (90a) by field-cooling using a magnet charger system (10), wherein the magnet charger system (10) comprises a background charger magnet (10a) and a field adjustment unit (10b), wherein the superconductor bulk magnet (90a) comprises a bulk magnet bore (4), wherein the bulk magnet bore (4) contains a sample volume (5), wherein the background charger magnet (10a) comprises a charger bore (3), wherein the superconductor bulk magnet (90a) is arranged within the charger bore (3), wherein the background charger magnet (10a) and the field adjustment unit (10b) are arranged radially outside the bulk magnet bore (4), and wherein the superconductor bulk magnet (90a) has a critical temperature T c ; with the steps of:
step a) the magnet charger system (10) is charged, such that after this charging it generates a first magnetic field in the sample volume (5), wherein the superconductor bulk magnet (90a) has a temperature T, with T>T c (300);
step b) the superconductor bulk magnet (90a) is cooled to a temperature T c (400);
step c) the magnet charger system (10) is discharged, what inductively charges the superconductor bulk magnet (90a), such that the superconductor bulk magnet (90a) traps a second magnetic field in the sample volume (5) (500); characterized in that before step a), a correlation between a magnetic field applied by the magnet charger system (10) from outside the superconductor bulk magnet (90a) and a resulting magnetic field trapped by the superconductor bulk magnet (90a) is determined at least approximately in the sample volume (5) (100, 550), and that in step a), the field adjustment unit (10b) is set such that the first magnetic field generated by the magnet charger system (10) in the sample volume (5) comprises a homogeneous magnetic field component and at least one non-homogeneous magnetic field component (300), wherein said at least one non-homogeneous field component is chosen, using said correlation, such that the second magnetic field of step c) has a higher homogeneity than the first magnetic field of step a) in the sample volume. The invention provides a method of magnetizing a superconducting bulk magnet, with which a higher homogeneity of the trapped magnetic field of the superconducting bulk magnet may be achieved in a simple way.