Reduction of magnetic field fluctuations in powered magnets for NMR using inductive measurements and sampled-data feedback control

► Temporal field fluctuations in powered magnets are unacceptable for NMR. ► Field fluctuations are characterized using inductive and NMR measurements. ► Feedback control provides a significant reduction in field fluctuations. ► Compensator design is guided by the disturbance spectra and system dynamics.