Design and Implementation of a Monitoring System for Measuring Polarization Degree of Optical Pumping 3He

doi:10.11938/cjmr20192720

Abstract

Abstract: Spin polarized ³He is widely used to polarize neutrons as neutron spin filters (NSF). China Mianyang Research Reactor (CMRR) has established the first spin exchange optical pumping (SEOP) polarized ³He neutron polarization system in China. In order to monitor the relative change in the polarizability of ³He as a function of time, a ³He polarimetry system based on nuclear magnetic resonance (NMR) was designed and implemented, with which the ³He polarizability could be monitored regularly using Matlab programs. The configuration and signal-to-noise ratio (SNR) of the pickup coil were optimized. It was shown that, for a given length of winding wire, the design of a Brooks coil could improve the SNR, and achieve maximal SNR when the average radius of the coil set to (a₀+d)/√2, where a₀ is the radius of ³He cell, and d is the distance between the pickup coil and the cell. The noise floor level of the system was also measured, and shown to be dominated by environment noise (0.27 μV/√Hz) and data acquisition (DAQ) card noise (0.40 μV/√Hz). The power spectral density of the system was found to be approximately √0.16+0.073G² μV/√Hz, where G is the gain of the amplifier.

Key words: free induction decay (FID), nuclear magnetic resonance (NMR), pickup coil, signal to noise ratio (SNR), polarized ³He

CLC Number:

O482.53

YAN Song, TU Xiao-qing, PENG Mei. Design and Implementation of a Monitoring System for Measuring Polarization Degree of Optical Pumping ³He[J]. Chinese Journal of Magnetic Resonance, 2020, 37(1): 114-122.

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Design and Implementation of a Monitoring System for Measuring Polarization Degree of Optical Pumping ³He

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