Precise NMR measurement and stabilization system of magnetic field of a superconducting 7T wave length shifter

Borovikov, V. M.; Fedurin, M.; Karpov, G. V.; Korshunov, Dmitry; Купер, Э. А.; Kuzin, M.V.; Mamkin, Vitaly; Medvedko, A.S.; Mezentsev, N. A.; Repkov, V. V.; Shkaruba, V. A.; Shubin, E. I.; Veremeenko, V.F.

doi:10.1016/s0168-9002(01)00273-x

Cited by 6 publications

(2 citation statements)

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“…Exotic sample materials would be required; for example, pressurized helium-3 47 or aluminum powders. 48 It is not obvious that 1 ppm accuracy could be reached with the small samples sizes necessary to achieve the required spatial resolution.…”

Section: Appendix E: Alternative Techniquesmentioning

confidence: 99%

Electron cyclotron resonance (ECR) magnetometry with a plasma reservoir

et al. 2020

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The local magnetic field in a Penning-Malmberg trap is found by measuring the temperatures that result when electron plasmas are illuminated by microwave pulses. Multiple heating resonances are observed as the pulse frequencies are swept. The many resonances are due to electron bounce and plasma rotation sidebands. The heating peak corresponding to the cyclotron frequency resonance is identified to determine the magnetic field. A new method for quickly preparing low density electron plasmas for destructive temperature measurements enables a rapid and automated scan of microwave frequencies. This technique can determine the magnetic field to high precision, obtaining an absolute accuracy better than 1 ppm, and a relative precision of 26 ppb. One important application is in situ magnetometry for antihydrogen-based tests of charge-parity-time symmetry and of the weak equivalence principle.

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Section: Appendix E: Alternative Techniquesmentioning

confidence: 99%

Electron cyclotron resonance (ECR) magnetometry with a plasma reservoir

et al. 2020

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“…NMR (nuclear magnetic resonance) is considered the gold standard for high-precision measurements of high-strength magnetic fields [ 1 , 2 , 3 , 4 , 5 , 6 ]. NMR magnetometers are often used to measure magnetic field values, map spatial magnetic field distributions (for example, in the main magnet of the MRI equipment to measure the homogeneity and temperature drift of the main magnetic field) [ 7 , 8 , 9 , 10 , 11 , 12 ], and calibrate magnetic field measurement equipment based on other physical principles [ 13 , 14 ]. However, magnetometers have been limited by the low signal-to-noise ratio (SNR) in low-strength magnetic field conditions, resulting in poor performance in low-strength magnetic field applications.…”

Section: Introductionmentioning

confidence: 99%

NMR Magnetometer Based on Dynamic Nuclear-Polarization for Low-Strength Magnetic Field Measurement

Guo

Wan

et al. 2023

Sensors

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Nuclear magnetic resonance (NMR) magnetometers are considered due to their ability to map magnetic fields with high precision and calibrate other magnetic field measurement devices. However, the low signal-to-noise ratio of low-strength magnetic fields limits the precision when measuring magnetic fields below 40 mT. Therefore, we developed a new NMR magnetometer that combines the dynamic nuclear polarization (DNP) technique with pulsed NMR. The dynamic pre-polarization technique enhances the SNR under a low magnetic field. Pulsed NMR was used in conjunction with DNP to improve measurement accuracy and speed. The efficacy of this approach was validated through simulation and analysis of the measurement process. Next, a complete set of equipment was constructed, and we successfully measured magnetic fields of 30 mT and 8 mT with an accuracy of only 0.5 Hz (11 nT) at 30 mT (0.4 ppm) and 1 Hz (22 nT) at 8mT (3 ppm).

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