Pickup coil optimization for polarized He-3 system
Pickup coil optimization for polarized He-3 system
复制标题
极化 He-3 系统的拾波线圈优化
DOI：
10.1140/epjp/i2017-11580-y
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发表时间：
2017
影响因子：
3.4
通讯作者：
Yan H
中科院分区：
文献类型：
--
作者：
Tu X Q;Zheng H;Sun G A;Gong J;Ren Y;Liu L J;Gao P L;Wang W Z;Yan H
极化3he气体不仅可以作为中子自旋过滤器（NSF），而且可以在标准模型之外寻找自旋相关的新相互作用。对于这两种情况，需要精确测量自旋极化惰性气体的相对极化。实际应用了各种核磁共振技术来监测3he细胞的极化。在这项工作中，我们尝试优化基于自旋交换光泵（SEOP）的3he系统的拾取线圈。通过优化信噪比（SNR），我们发现线圈应该用细线缠绕，匝数更高。拾取线圈的最佳尺寸取决于详细的配置。对于具有半径的球形3he细胞，我们发现优化的线圈半径为，其中为线圈到细胞表面的距离。对于具有高度的圆柱3he单元，对于沿或垂直于目标单元的纵轴放置线圈的配置，我们推导了特定配置的优化尺寸。我们相信这些结果对于设计极化3he系统的拾取线圈具有实际意义。
Not only can polarized3He gas work as neutron spin filters (NSF) but also search for spin-dependent new interactions beyond the standard model. For both cases, the relative polarization of the spin polarized noble gas needs to be measured precisely. Various NMR techniques are applied practically to monitor the3He cell’s polarization. In this work, we tried to optimize the pickup coil for the spin exchange optical pump (SEOP) based3He system. By optimizing the signal-to-noise ratio (SNR), we found that the coil should be wound by thin wire for a higher number of turns. The optimized sizes of the pickup coils depend on the detailed configurations. For a spherical3He cell with radiusa, we found the optimized coil radius is, wheredis the coil to cell surface distance. For a cylindrical3He cell with heighth, for the configurations where the coils were placed either along or perpendicular to the longitudinal axis of the target cell, we derived the optimized sizes for the specific configurations. We believe these results are practically useful for designing pickup coils of polarized3He systems.