光泵抽运3He极化程度监控系统的设计与实现

doi:10.11938/cjmr20192720

摘要/Abstract

摘要： 极化³He的一项重要应用是中子的极化.中国绵阳研究堆（CMRR）已建立国内首个自旋交换光学泵浦（SEOP）极化³He中子极化系统.为了监测³He的极化率随时间的相对变化情况，本文首先设计了基于核磁共振（NMR）技术的³He相对极化率测量系统，通过Matlab控制程序实现了对³He相对极化率的定时检测.然后对拾波线圈的构形和信噪比（SNR）进行了优化.结果表明当绕线长度一样时，Brooks构形的线圈有利于提高SNR；当线圈的平均半径为（a₀+d）/√2（a₀为³He气室的半径，d为拾波线圈与气室之间的距离）时，其SNR最高.最后对该系统的本底噪声进行了测量，发现其主要来源于环境噪声（0.27 μV/√Hz）和数据采集（DAQ）卡的噪声（0.40 μV/√Hz），系统的总噪声功率谱密度约为√0.16+0.073G² μV/√Hz（G为放大器的增益倍数）.

关键词: 自由感应衰减(FID), 核磁共振(NMR), 拾波线圈, 信噪比(SNR), 极化³He

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

中图分类号:

O482.53

闫松, 屠小青, 彭梅. 光泵抽运³He极化程度监控系统的设计与实现[J]. 波谱学杂志, 2020, 37(1): 114-122.

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.

参考文献

[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]. 3^rd 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.

光泵抽运³He极化程度监控系统的设计与实现

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

PDF

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

编辑推荐

Metrics

本文评价

[1]	尹田鹏, 李幸, 汪泽, 王雅溶, 王敏. 石斛属植物中石斛碱类成分的波谱学特征[J]. 波谱学杂志, 2020, 37(3): 381-389.
[2]	刘欢, 徐锦绣, 郑炀, 熊镭. 渤海J油田储层核磁共振测井孔隙度影响因素分析及校正[J]. 波谱学杂志, 2020, 37(3): 370-380.
[3]	张宫, 何宗斌, 曹文倩, 陈瑶. 回波间隔对核磁共振表观孔隙度的影响及矫正方法[J]. 波谱学杂志, 2020, 37(2): 172-181.
[4]	刘慧霞, 辛家祥, 魏达秀, 姚叶锋. 核自旋单重态的制备及其转化效率和寿命的影响因素分析[J]. 波谱学杂志, 2020, 37(2): 182-192.
[5]	张一鸣, 陈志雪, 杨晓云. 丁氟螨酯的波谱学数据解析与结构确证[J]. 波谱学杂志, 2020, 37(2): 224-231.
[6]	赵智慧, 刘表兰, 闫小双, 武帅帅, 茹阁英, 毛诗珍, 冯继文. PSSS₅₀-b-PNIPAM₃₀₀嵌段共聚物在二元溶剂中自组装的NMR研究[J]. 波谱学杂志, 2019, 36(4): 502-509.
[7]	方仲佩, 孙鹏, 王倩文, 张亮, 刘买利, 张许. 天然同位素丰度野生型酵母细胞色素c构象变化的核磁共振检测[J]. 波谱学杂志, 2019, 36(4): 481-489.
[8]	杨盈, 黄少华, 冯继文. 核磁共振氢谱中二苯基乙二胺衍生物手性识别其结构类似物[J]. 波谱学杂志, 2019, 36(4): 525-533.
[9]	李震, 蔡宏浩, 雷国伟, 赖宗英, 吴孟键, 闫瑾, 潘邵斌. 不均匀场下基于分子间双量子相干核磁共振技术的果肉检测[J]. 波谱学杂志, 2019, 36(4): 563-570.
[10]	王亚兰, 王晓静, 王志伟. 阿齐沙坦的波谱学数据及结构确证[J]. 波谱学杂志, 2019, 36(3): 350-358.
[11]	胡坤, 孙汉董, 普诺·白玛丹增. 量子化学计算核磁共振参数在天然产物结构鉴定中的应用[J]. 波谱学杂志, 2019, 36(3): 359-376.
[12]	尹田鹏, 王雅溶, 王敏, 石文智, 张正茜, 何莎莎. 三个C₁₉-二萜生物碱的NMR数据全归属[J]. 波谱学杂志, 2019, 36(3): 331-340.
[13]	杨云汉, 杜瑶, 应飞祥, 杨俊丽, 夏大真, 夏福婷, 杨丽娟. 柚皮素/β-环糊精超分子体系的包合行为[J]. 波谱学杂志, 2019, 36(3): 319-330.
[14]	曹园, 吴永平, 陈东军. 卷柏属Selaginellin类化合物互变异构的波谱学研究[J]. 波谱学杂志, 2019, 36(2): 155-163.
[15]	陈晓瑛, 俞刚金, 毛诗珍, 刘买利, 杜有如. 利用¹H NMR探究混合离子型/非离子型表面活性剂临界胶束浓度降低的实质[J]. 波谱学杂志, 2019, 36(2): 219-224.