Design and construction of a dipolar Halbach array with a homogeneous field from identical bar magnets:: NMR Mandhalas
Design and construction of a dipolar Halbach array with a homogeneous field from identical bar magnets:: NMR Mandhalas
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DOI：
10.1002/cmr.b.20018
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发表时间：
2004-10-01
影响因子：
0.9
通讯作者：
Blümler, P
中科院分区：
文献类型：
--
作者：
Raich, H;Blümler, P
Halbach布局的磁体对于在移动的NMR/ MRI设备中的使用是令人感兴趣的。因此，使用相同的条形磁体来迭代理想的Halbach磁体，条形磁体基于分析方程来定位和定向。这些配置与二维有限元方法进行了模拟。性能因素被定义为磁场强度与均匀性和质量相关。16个磁体的几何形状在性能和用于存储超极化氙的所需用途的特殊要求之间提供了良好的折衷。这种磁体的构造需要设计专用的支撑框架和安装它们的程序。磁场强度和均匀性在成品磁铁的霍尔探头测量，并同意与模拟。详细描述了计算和构造，并且与n个磁体（n小于或等于80）的表列场值一起可以证明有助于构造类似的装置，其被命名为NMR Mandhalas（新颖离散Halbach布局的磁体布置）。(C)2004 Wiley Periodicals，Inc.
Magnets of the Halbach layout are interesting for the use in mobile NMR/ MRI devices. Therefore, the ideal Halbach magnet was iterated using identical bar magnets, which are positioned and oriented based on analytical equations. These configurations were simulated with two-dimensional finite-element methods. Performance factors were defined to relate field strength with homogeneity and mass. A geometry of 16 magnets provided a good compromise between performance and special requirements for the desired use to store hyperpolarized xenon. The construction of such a magnet required the design of dedicated support frames and procedures to mount them. The field strength and homogeneity in the finished magnet were measured by a Hall probe and agreed well with the simulations. The calculation and construction are described in detail and together with the tabled field values for n magnets with n less than or equal to 80 may prove helpful for building similar devices, which were named NMR Mandhalas (Magnet Arrangements for Novel Discrete Halbach Layout). (C) 2004 Wiley Periodicals, Inc.