NMR phase noise in Bitter magnets

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


We have studied the temporal instability of a high field resistive Bitter magnet through nuclear magnetic resonance (NMR). This instability leads to transverse spin decoherence in repeated and accumulated NMR experiments as is normally performed during signal averaging. We demonstrate this effect via Hahn echo and Carr-Purcell-Meiboom-Gill (CPMG) transverse relaxation experiments in a 23-T resistive magnet. Quantitative analysis was found to be consistent with separate measurements of the magnetic field frequency fluctuation spectrum, as well as with independent NMR experiments performed in a magnetic field with a controlled instability. Finally, the CPMG sequence with short pulse delays is shown to be successful in recovering the intrinsic spin-spin relaxation even in the presence of magnetic field temporal instability.

Original languageEnglish (US)
Pages (from-to)309-313
Number of pages5
JournalJournal of Magnetic Resonance
Issue number2
StatePublished - 2001

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Nuclear and High Energy Physics
  • Biophysics
  • Biochemistry


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