  Bulk high-temperature superconductors (HTS) are capable of generating very
strong magnetic fields while maintaining a relatively compact form factor.
Solenoids constructed using stacks of ring-shaped bulk HTS have been
demonstrated to be capable of nuclear magnetic resonance (NMR) spectroscopy and
magnetic resonance imaging (MRI). However, these stacks were magnetised via
field cooling (FC), which typically requires a secondary superconducting
charging magnet capable of sustaining a high magnetic field for a long period.
A more economical alternative to FC is pulsed field magnetisation, which can be
carried out with a magnet wound from a normal conductor, such as copper. In
this work, we present a technique we have developed for iteratively
homogenising the magnetic field within a stack of ring-shaped bulk HTS by
manipulating the spatial profile of the applied pulsed field.
