Tunable homogeneous kG magnetic field production using permanent magnets.
Tunable homogeneous kG magnetic field production using permanent magnets.
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DOI：
10.1063/5.0064498
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发表时间：
2021-07
期刊：
影响因子：
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通讯作者：
D. Pizzey
中科院分区：
文献类型：
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作者：
D. Pizzey
我们提出了一个永久环形磁铁安排，可以实现从1.80（5）到2.67（9）kG的可调谐轴向磁场。该装置已被设计成容纳长度为25 mm和直径为25 mm的圆柱形原子蒸气室，以位于环形磁体的孔内，从而提供用于在大磁场中通过原子蒸气成像的替代路线。测得的轴向磁场的均方根变化小于4%的蒸汽细胞的长度，而计算出的场的不均匀性是小于5%的径向和12%的纵向直径为20毫米，长度为25毫米的圆柱形体积。该仪器由分层的同心现成的N42钕铁硼轴向磁化的环形磁铁。磁体被组织成四个圆柱形黄铜支架，其相对分离可以被操纵以实现所需的磁场强度。我们目前的磁场计算和马夸特-莱文伯格适合实验数据，并表现出良好的理论和实验之间的协议。
We present a permanent ring magnet arrangement that can achieve a tunable axial magnetic field from 1.80(5) to 2.67(9) kG. The apparatus has been designed to accommodate a cylindrical atomic vapor cell of length 25 mm and diameter 25 mm to lie within the bore of the ring magnets, providing an alternative route for imaging through atomic vapors in large magnetic fields. The measured axial magnetic field has an rms variation of less than 4% over the length of vapor cell, while the calculated field inhomogeneity is less than 5% radially and 12% longitudinally across a cylindrical volume with diameter 20 mm and length 25 mm. The instrument consists of layered concentric off-the-shelf N42 neodymium-iron-boron axially magnetized ring magnets. The magnets are organized into four cylindrical brass holders, whose relative separation can be manipulated to achieve the desired magnetic field strength. We present magnetic field computations and Marquardt-Levenberg fits to experimental data and demonstrate excellent agreement between theory and experiment.