The energizing of a NMR superconducting coil by a superconducting rectifier

Author

Sikkenga, J. ; Knoben, J. ; Spoorenberg, C. J G ; Kraaij, G.J. ; Klundert, L. J M V D ; Kate, H. H J Ten

Author_Institution

HOLEC Innovation and Technology, Hengelo, The Netherlands

Volume

21

Issue

2

fYear

1985

fDate

3/1/1985 12:00:00 AM

Firstpage

440

Lastpage

443

Abstract

NMR magnets require a good homogeneity within a certain volume and an excellent field stability. The homogeneity can be met using a superconducting shim coil system. The field stability requires a constant current, although in many cases the current decay time constant is too low, due to imperfections in the superconducting wire and joints. This can be overcome using a rectifier. The rectifier can also be used to load the coil. The combination and interaction of the superconducting NMR coil (2.0 Tesla and 0.35 m cold bore) and the rectifier (20 W / 1 kA) is tested. The safety of the system is discussed. The shim coil system can compensate the strayfield of the rectifier. The field decay compensation will be discussed.

Keywords

Nuclear magnetic resonance imaging; Rectifiers; Superconducting coils; Boring; Nuclear magnetic resonance; Rectifiers; Safety; Stability; Superconducting coils; Superconducting filaments and wires; Superconducting magnets; Switches; Technological innovation;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1985.1063857

Filename

1063857