Measurements of magnetic field stability in inhomogeneous magnetic fields at low temperature

We present an original method for field stability measurements in a bath of liquid helium. This method is used to validate the power supply of a superconductive magnet operating in driven mode. The experiment consists in the measurement of the NMR signal of a sample of liquid 3He, placed inside the...

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Veröffentlicht in:	Journal of magnetic resonance (1997) 2010, Vol.202 (1), p.1-8
Hauptverfasser:	Hugon, Cedric, Jacquinot, Jacques-Francois, Sakellariou, Dimitris
Format:	Artikel
Sprache:	eng
Schlagworte:	Anisotropy Cold Temperature Electromagnetic Fields Equipment Design Equipment Failure Analysis Field stability Helium - chemistry Inductive coupling Inhomogeneous field Liquid 3He Magnetic Resonance Spectroscopy - methods NMR Radiometry - instrumentation Radiometry - methods Reproducibility of Results Scattering, Radiation Sensitivity and Specificity Solutions - chemistry
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Beschreibung
Zusammenfassung:	We present an original method for field stability measurements in a bath of liquid helium. This method is used to validate the power supply of a superconductive magnet operating in driven mode. The experiment consists in the measurement of the NMR signal of a sample of liquid 3He, placed inside the field of a test magnet driven by a power supply. The homogeneity of the magnet is a strongly limiting factor for measurements but through the use of an inductively coupled microcoil and careful signal processing, a precision of 5.5 ppm was achieved.
ISSN:	1090-7807 1096-0856
DOI:	10.1016/j.jmr.2009.08.005