Precision magnetometry at cryogenic temperatures with gaseous 3He NMR probes

Abstract

We report on compact, gaseous 3He NMR probes for precision magnetometry of magnetic fields B > 0.1 T in the temperature range from ambient temperatures down to 4 Kelvin. The gas is polarized at thermal equilibrium under pressures up to 100 bar to provide a high nuclear spin density. In order to achieve sensor readout rates of order (Hz), paramagnetic substances and/or silica gel with high specific surface area were added to reduce the otherwise long T1 relaxation time of pure 3He gas to reach thermal polarization equilibrium. Sensitivity limits, which cover the range from 10-11 < dB/B < 10-7, are accessible in a single-pulse NMR measurement and can be further improved through signal averaging in accumulated NMR scans.

arXiv comment13 pages, 12 figures

References in corpus (7)

• Final Report of the Muon E821 Anomalous Magnetic Moment Measurement at BNL
• Optically Polarized ${}^3$He
• Ultra-sensitive magnetometry based on free precession of nuclear spins
• Direct measurement of the ${}^3$He${}^{+}$ magnetic moments
• Ultrasensitive 3He magnetometer for measurements of high magnetic fields
• Gaseous ${}^3$He Nuclear Magnetic Resonance Probe for Cryogenic Environments
• Spherical Fused Silica Cells Filled with Pure Helium for NMR-Magnetometry