Quantum机电计量套件的磁体系统
Magnet system for the Quantum Electro-Mechanical Metrology Suite
摘要：
介绍了新一代量子机电计量系统（QEMMS）的永磁体系统设计。QEMMS由美国国家标准与技术研究所（NIST）开发，由Kibble天平、可编程约瑟夫森电压标准和量子霍尔电阻标准组成。它将用于测量质量高达$100\,\mathrm{g}$，相对不确定度低于$2\times 10^{-8}$。磁体系统基于NIST-4磁体系统的设计，并进行了重大更改，以适应更小的Kibble天平并克服已知的实际限制。提供分析模型来描述线圈电流效应，并对将磁体分成两部分以安装线圈所需的力进行建模。这两种模型进行比较，有限元分析和测量结果得到的模拟结果。其他方面，如线圈设计和$Bl$轮廓的平坦度也被考虑。
英文摘要：
The design of the permanent magnet system for the new Quantum Electro-Mechanical Metrology Suite (QEMMS) is described. The QEMMS, developed at the National Institute of Standards and Technology (NIST), consists of a Kibble balance, a programmable Josephson voltage standard, and a quantum Hall resistance standard. It will be used to measure masses up to $100\,\mathrm{g}$ with relative uncertainties below $2\times 10^{-8}$. The magnet system is based on the design of the NIST-4 magnet system with significant changes to adopt to a smaller Kibble balance and to overcome known practical limitations. Analytical models are provided to describe the coil-current effect and model the forces required to split the magnet in two parts to install the coil. Both models are compared to simulation results obtained with finite element analysis and measurement results. Other aspects, such as the coil design and flatness of $Bl$ profile are considered.
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