A method for fast field settling in cryogen-free superconducting magnets for NMR

Eugeny Kryukov; Yury Bugoslavsky; Angel Joaquin Perez Linde; Thomas Holubar; Stephen Burgess; David Marlow; Jeremy Good

doi:10.1016/j.ssnmr.2020.101684

A method for fast field settling in cryogen-free superconducting magnets for NMR

Solid State Nucl Magn Reson. 2020 Oct:109:101684. doi: 10.1016/j.ssnmr.2020.101684. Epub 2020 Aug 19.

Authors

Eugeny Kryukov¹, Yury Bugoslavsky², Angel Joaquin Perez Linde², Thomas Holubar², Stephen Burgess², David Marlow², Jeremy Good²

Affiliations

¹ Cryogenic Ltd, London, UK. Electronic address: eugeny@cryogenic.co.uk.
² Cryogenic Ltd, London, UK.

PMID: 32871406
DOI: 10.1016/j.ssnmr.2020.101684

Abstract

We propose a fast algorithm to energise a cryogen free magnet to a highly persistent state. A decay rate as low as 0.021 ppm/h can be achieved in less than an hour after reaching the target field. The decay rate drops further to 0.0004 ppm/h in the following 48 h. This procedure can be applied at different values of target field, which makes it feasible to use a single magnet for study of various NMR lines at different fields. The mechanism of establishing a highly stable magnetic field can be understood on the basis of the magnetic properties of the superconducting wire, which were studied using a vibrating sample magnetometer. The results confirm the high quality of the superconducting wire and joints.

Keywords: Cryogen-free magnets; Fast field settling; Milti field application.