Development of Magnetic Field Mapping System for the MuSEUM Experiment With High Precision Using CW-NMR Probes

Development of Magnetic Field Mapping System for the MuSEUM Experiment With High Precision Using CW-NMR Probes
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使用 CW-NMR 探针开发高精度 MuSEUM 实验磁场测绘系统

DOI：
10.1109/tasc.2022.3190264
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发表时间：
2022
期刊：
IEEE Transactions on Applied Superconductivity
影响因子：
1.8
通讯作者：
Shimomura Koichiro
Shimomura Koichiro
中科院分区：
物理与天体物理3区
文献类型：
--
作者：
Tada Hiroki;Yoshizu Fumihiro;Oyama Shun;Tanaka Toya;Sasaki Ken-ichi;Shimomura Koichiro

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博物馆实验计划在J-PARC测量1.7 t下μ子的超精细结构，目的是通过精确测量基态μ子的超精细结构来测试标准理论。其中一个重要的参数是磁场均匀性，在直径为20 cm、长轴长度为30 cm的旋转椭球区域内，磁场均匀性要求小于0.2 ppm（峰对峰）。为了执行磁场振荡并验证磁场的均匀性，我们正在开发一种使用分辨率小于10 ppb的CW（连续波）-NMR探针的磁场分布测量系统。在本设计中，24个CW-NMR探针被安排在一个半圆形的圆周上，以便快速测量。由于每个探头都位于较近的距离，因此应尽量减少探头之间的串扰影响。确定了每个探头的参数，并测试了多个通道的操作。此外，用八通道系统精确地测量了铁垫片的影响。
The MuSEUM experiment is planned at J-PARC to measure the hyperfine structure of a muonium at 1.7 T. The aim is to test the standard theory by precisely measuring the hyperfine structure of a muonium in the ground state. An important parameter is the magnetic field uniformity, which is required to be smaller than 0.2 ppm (peak-to-peak) in a rotating ellipsoid region with a diameter of 20 cm and a major axis length of 30 cm. To perform magnetic field shimming and verify the uniformity of the magnetic field, We are developing a magnetic field distribution measurement system using a CW (Continuous Wave)-NMR probe with a resolution of smaller than 10 ppb. In the present design, twenty-four CW-NMR probes are arranged in a semicircular circumference for quick measurement. Because each probe is located at a short distance, the effect of a crosstalk among probes should be minimised. Parameters of each probe has been determined and operation with multiple channels has been tested. Moreover, an influence of iron shims has been measured accurately with a eight-channel system.
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