A flux pump for NMR magnets

Author

Lee, Haigun ; Kim, Ho Min ; Iwasa, Yukikazu

Author_Institution

MIT Francis Bitter Magnet Lab., Cambridge, MA, USA

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

1640

Lastpage

1643

Abstract

A flux pump coupled to a slightly dissipative NMR magnet enables the magnet to operate effectively in persistent mode. This paper presents: 1) design and operation concept of the flux pump; 2) parameters and performance results of a prototype flux pump; and 3) a plan to couple a full-scale flux pump to two NMR magnets, one comprised of low- and high-temperature (LTS/HTS) superconducting coils in which the HTS insert is dissipative and the other an all-LTS which can be artificially made resistive. Performance results of the prototype coupled, sequentially, to two Nb-Ti magnets show that agreement between analysis and experiment is excellent.

Keywords

high-temperature superconductors; magnetic flux; nuclear magnetic resonance; superconducting coils; superconducting magnets; HTS coil; LTS coil; NMR magnet; Nb-Ti; Nb-Ti magnets; dissipative HTS insert; flux pump; high-temperature superconducting coil; low-temperature superconducting coil; persistent mode; Conducting materials; Couplings; Helium; High temperature superconductors; Magnetic materials; Niobium; Nuclear magnetic resonance; Prototypes; Superconducting magnets; Tin;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.812852

Filename

1211918