DONALD: A 2.5?T wide sample space permanent magnet

摘要

Graphical abstract Display Omitted Abstract The permanent magnet apparatus described herein is based upon the C-shaped permanent magnet. It is designed to maximise field strength while increasing the pole gap to 5?mm, providing a sample volume large enough for wide applicability. The production of this equipment aims to provide a homogeneous, high field (～2.5?T) magnetic sample environment with a volume large enough to accommodate solution crystallisation experiments in sample chambers such as NMR tubes and cuvettes whilst simultaneously allowing direct observation of the sample from a wide angle. Although the resulting rig is not lightweight at 26.5?kg it is eminently more portable than an equivalent electromagnet system (of the order of 625?kg), and provides a max field strength of 2.468?T with relatively low stray field.