Designing Optimal Loop, Saddle, and Ellipse-Based Magnetic Coils by Spherical Harmonic Mapping. - Peter J. Hobson; Noah L. Hardwicke; Alister Davis; Thomas X. Smith; Chris Morley; Michael Packer; Niall Holmes; Max A. Weil; Matthew J. Brookes; Richard Bowtell; T. Mark Fromhold (IEEE Trans. Instrum. Meas., 2023)