设计制作了由永磁材料构成的，能提供均匀磁场的环形磁场。
An axial magnetic field is designed by using the permanent magnet. It is a magnetic ring.
本文推导出的公式适于计算环形流道横向均匀磁场的电磁流量计的灵敏度。
The formula derived in this paper is recommended to calculate the sensitivity of the annular-channel uniform transverse field flowmeter.
因此，在环形磁约束聚变装置中，对其磁场拓扑结构的研究是非常重要的。
Thus, it is important to research the generic topology of the magnetic field in a toroidal device.
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