Inductive shielding of NMR phase noise

E. E. Sigmund*, V. F. Mitrović, E. S. Calder, G. W. Thomas, H. N. Bachman, William P Halperin, P. L. Kuhns, A. P. Reyes

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

We report on a solution to the problem of phase noise in nuclear magnetic resonance (NMR) experiments. Phase noise refers to the variation in the phases of NMR signals from successive acquisitions due to an unstable applied field. Such a situation exists in high-field resistive Bitter magnets and, for sufficiently long timescales, can cause serious signal degradation upon signal averaging. An inductive shield, formed by a highly conducting metal tube placed around the sample and along the applied field, provides screening of the AC components of the applied field and thereby retains phase coherence over long periods. Although simple in principle there are technical difficulties for practical implementation of this method. We present demonstrations of the utility of this approach. In particular, we show a significant extension of the effective transverse coherence time of the 13C resonance in doubly 13C-labeled glycerol in a resistive Bitter magnet. This was accomplished through the use of a highly conducting aluminum shield, cooled to 4 K with liquid helium.

Original languageEnglish (US)
Pages (from-to)190-194
Number of pages5
JournalJournal of Magnetic Resonance
Volume159
Issue number2
DOIs
StatePublished - Dec 1 2002

Keywords

  • Bitter magnet
  • Phase noise
  • Shielding

ASJC Scopus subject areas

  • Molecular Biology
  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Radiology Nuclear Medicine and imaging
  • Condensed Matter Physics

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    Sigmund, E. E., Mitrović, V. F., Calder, E. S., Thomas, G. W., Bachman, H. N., Halperin, W. P., Kuhns, P. L., & Reyes, A. P. (2002). Inductive shielding of NMR phase noise. Journal of Magnetic Resonance, 159(2), 190-194. https://doi.org/10.1016/S1090-7807(02)00012-5