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 (3)He, 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.
Hugon
Cedric
C
CEA, DSM, IRAMIS, SIS2M, LSDRM, CEA Saclay, Gif-sur-Yvette, France. cedric.hugon@cea.fr
Jacquinot
Jacques-Francois
JF
Sakellariou
Dimitris
D
D016880:Anisotropy; D003080:Cold Temperature; D004574:Electromagnetic Fields; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006371:Helium / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods*; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012680:Sensitivity and Specificity; D012996:Solutions / Q000737:chemistry
D012996:Solutions; D006371:Helium