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J Magn Reson. 2006 Dec;183(2):303-7. Epub 2006 Oct 4.

A field-sweep/field-lock system for superconducting magnets--Application to high-field EPR.

Author information

1
Francis Bitter Magnet Laboratory and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Abstract

We describe a field-lock/field-sweep system for the use in superconducting magnets. The system is based on a commercially available field mapping unit and a custom designed broad-band 1H NMR probe. The NMR signal of a small water sample is used in a feedback loop to set and control the magnetic field to high accuracy. The current instrumental configuration allows field sweeps of +/-0.4 T and a resolution of up to 10(-5) T (0.1 G) and the performance of the system is demonstrated in a high-field electron paramagnetic resonance (EPR) application. The system should also be of utility in other experiments requiring precise and reproducible sweeps of the magnetic field such as DNP, ENDOR or PELDOR.

PMID:
17027306
PMCID:
PMC2518535
DOI:
10.1016/j.jmr.2006.09.012
[Indexed for MEDLINE]
Free PMC Article

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