Chinese Journal of Magnetic Resonance >

2020 , Vol. 37 >Issue 1: 114 - 122

DOI: https://doi.org/10.11938/cjmr20192720

Articles

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

  • YAN Song ,
  • TU Xiao-qing ,
  • PENG Mei
Expand
  • 1. Key Laboratory of Neutron Physics, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;
    2. School of Science, Beijing Jiaotong University, Beijing 100044, China

Received date: 2019-03-14

  Online published: 2019-05-30

Fold

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

Cite this article

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 . DOI: 10.11938/cjmr20192720

References

[1] GENTILE T R, NACHER P J, SAAM B, et al. Optically polarized 3He[J]. Rev Mod Phys, 2017, 89(4):045004.
[2] CHEN W C, GENTILE T R, YE Q, et al. Recent advancements of wide-angle polarization analysis with 3He neutron spin filters[J]. Journal of Physics:Conference Series, 2016, 746(1):012016.
[3] BABCOCK E, SALHI Z, GAINOV R, et al. Recent on-beam tests of wide-angle neutron polarization analysis with a 3He spin filter:magic pastis on V20 at HZB[J]. Journal of Physics:Conference Series, 2017, 862(1):012002.
[4] FU C B, GENTILE T R, SNOW W M. Limits on possible new nucleon monopole-dipole interactions from the spin relaxation rate of polarized 3He gas[J]. Phys Rev D, 2011, 83(3):031504.
[5] YAN H, SUN G A, PENG S M, et al. Searching for new spin-and velocity-dependent interactions by spin relaxation of polarized 3He gas[J]. Phys Rev Lett, 2015, 115(18):182001.
[6] YAN S, ZHANG M F, GUO W C, et al. Development of a polarized 3He neutron spin filter based on spin exchange optical pumping at china mianyang research reactor[J]. Sci China Phys Mech Astron, 2019, 62:102021. doi:10.1007/s11433-019-9410-3.
[7] WANG W Z, HU B T, ZHENG H, et al. A new magnetic field system for 3He polarization[J]. Acta Phys Sin, 2018, 67(17):176701. 王文钊, 胡碧涛, 郑皓, 等. 一种可用于极化3he实验的新型磁场系统[J]. 物理学报, 2018, 67(17):176701.
[8] TU X Q, ZHENG H, SUN G A, et al. Pickup coil optimization for polarized 3He system[J]. The European Physical Journal Plus, 2017, 132(7):308-318.
[9] SUN G A, ZHANG C S, CHEN B, et al. A new operating neutron scattering facility CMRR in china[J]. Neutron News, 2016, 27(4):21-26.
[10] LIU Y T, CHEN D F. Overview and progress of neutron scattering facilities at CARR[J]. Aapps Bulletin, 2014, 24(2):20-22.
[11] CHEN H S, WANG X L. China's first pulsed neutron source[J]. Nat Mater, 2016, 15(7):689-691.
[12] CHEN W C, GENTILE T R, YE Q, et al. On the limits of spin-exchange optical pumping of 3He[J]. J Appl Phys, 2014, 116(1):014903.
[13] LEE S, MOON M K, KIM J, et al. In-situ compact 3He neutron spin polarizer based on a magneto-static cavity with built-in NMR coils[J]. Journal of Physics:Conference Series, 2016, 711(1):012014.
[14] JIANG C Y, TONG X, BROWN D R, et al. New generation high performance in situ polarized 3He system for time-of-flight beam at spallation sources[J]. Rev Sci Instrum, 2017, 88(2):025111.
[15] BABCOCK E. Spin exchange optical pumping with alkali metal vapors[D]. Madison:University of Wisconsin Madison, 2005.
[16] LIU Y, SONG M H, WANG K, et al. A magnetic resonance receiver system design based on all programmable system-on-a-chip and LabVIEW[J]. Chinese J Magn Reson, 2018, 35(4):475-485. 刘颖, 宋明辉, 王坤, 等. 基于全可编程SoC和LabVIEW的磁共振接收系统设计[J]. 波谱学杂志, 2018, 35(4):475-485.
[17] GUO X Y, XIAO L. Design of a receiver for magnetic resonance imaging based on data acquisition card and GPU[J]. Chinese J Magn Reson, 2016, 33(4):581-689. 郭新宇, 肖亮. 基于数据采集卡和GPU的MRI信号接收设计[J]. 波谱学杂志, 2016, 33(4):581-589.
[18] JACKSON J D. Classical Electrodynamics[M]. Wiley, 1998.
[19] WILMS E, EBERT M, HEIL W, et, al. Polarimetry on dense samples of spin-polarized 3He by magneto static detection[J]. Nucl Instrum Meth A, 1997, 2(401):491-498.
[20] ASAF G, MICHAEL J H, SUBHAS C M. High sensitivity magnetometers[M]. Springer, 2017.
[21] CHANG X, SU G Q, NIE S D. Wavelet transform-based signal denoising in low-field NMR[J]. Chinese J Magn Reson, 2018, 35(3):393-406. 常晓, 苏冠群, 聂生东. 基于小波变换的低场核磁共振信号去噪方法的研究进展[J]. 波谱学杂志, 2018, 35(3):393-406.
[22] 卡兰塔罗夫(苏), 采依特林(苏). 电感计算手册[M]. 北京:机械工业出版社, 1992.
[23] GROVER F W. Inductance calculations-working formulas and tables[M]. New York:Dover Publication, 2009:60-174.
[24] ROSA E B. Formulae and tables for the calculation of mutual and self-inductance[M]. London:Forgotten Books, 2017:45-60.
[25] WHEELER H A. Inductance formulas for circular and square coils[J]. Proceedings of the IEEE, 1982, 70(12):1449-1450.
[26] TIAN B F, WANG Y, ZHANG J, et al. Design and implementation of an electromagnetic noise set system in nuclear magnetic resonance sounding environment[J]. Journal of Jilin University (Engineering and Technology Edition), 2015, 45(6):2034-2042.田宝凤, 王悦, 张健, 等. 核磁共振测深环境电磁噪声测试系统的设计及实现[J]. 吉林大学学报(工学版), 2015, 45(6):2034-2042.
[27] XU P J. Measurement of electromagnetic radiation[J]. Nuclear Electronics & Detection Technology, 1986(S1):57-70. 徐培基. 电磁辐射的测量[J]. 核电子学与探测技术, 1986, S1:57-70.
[28] 帅震清. 电磁环境测量技术[M]. 北京:人民交通出版社, 2014.
[29] MCKETTERICK T J, BOAG S, STEWART J R, et al. Optimized adiabatic fast passage spin flipping for 3He neutron spin filters[J]. Physica B, 2011, 406(12):2436-2438.
[30] CHANN B, BABCOCK E, ANDERSON L W, et al. Measurements of 3He spin-exchange rates[J]. Phys Rev A, 2002, 66(3):032703.
[31] WILLIAM H P, TEUKOLSKY S A, VETTERLING W T, et al. Numerical recipes:The art of scientific computing[M]. 3rd Ed. Cambridge:Cambridge University Press, 2007:600-650.
[32] HOROWITZ P, HILL W. The Art of Electronics[M]. Cambridge:Cambridge University Press, 1980:520-560.
[33] SHI H Y, WANG Y Z, LIN J. Optimal design of low-noise induction magnetometer in 1mHz-10kHz utilizing paralleled dual-JFET differential pre-amplifier[J]. IEEE Sensors Journal, 2016, 16(10):3580-3586.
[34] ART KAY. Operational amplifier noise:techniques and tips for analyzing and reducing noise[M]. Netherlands:Newnes, 2012.
[35] ASPARUHOVA K K, GADJEVA E D. Noise analysis of operational amplifier circuits using MATLAB[C]. Banyak:27th International Spring Seminar on Electronics Technology:Meeting the Challenges of Electronics Technology Progress, 2004.
Options
Outlines

/

〈 〉

Copyright © 2017 Editorial Board of Chinese Journal of Magnetic Resonance
Powered by Beijing Magtech Co. Ltd