The ALPHA-g Antihydrogen Gravity Magnet System
The ALPHA-g Antihydrogen Gravity Magnet System
复制标题
ALPHA-g 反氢重力磁体系统
DOI：
10.1109/tasc.2020.2981272
复制
发表时间：
2020
影响因子：
1.8
通讯作者：
Bertsche, William
中科院分区：
文献类型：
--
作者：
So, Chukman;Fajans, Joel;Bertsche, William
欧洲核子研究中心的阿尔法-g实验旨在利用被限制在磁捕获器中的反氢原子，首次精确测量反物质的重量。在测量中，反原子被允许通过陷阱中的下端口或上端口逃逸，其上下平衡取决于重力和端口处的陷阱场。要实现1%重量精度的初始目标，需要构建一个能够将陷阱场控制在10ppm水平的磁体系统，并创建等离子体(反质子和正电子)和反氢操作所需的其他场配置。为此，建立了一个高精度超导磁体系统，该系统由5个八极和24个线圈组成，由一个屏蔽螺线管包裹。每个元素的数量、位置、层结构和导体结构都经过精心设计，以最大限度地减少磁不对称，同时考虑到持续电流、制造公差和反原子轨道。
The ALPHA-g experiment at CERN aims to perform the first-ever precision measurement of the weight of antimatter, using antihydrogen atoms confined in a magnetic trap. In the measurement, anti-atoms are allowed to escape through either a lower or an upper port in the trap, the up-down balance of which depends on gravity and the trap field at the ports. Achieving the initial target of 1% precision in weight requires constructing a magnet system capable of controlling the trap field at the 10 ppm level, as well as creating other field configurations needed for plasma (antiproton and positron) and antihydrogen manipulation. A high precision superconducting magnet system is constructed for this purpose, containing five octupoles and 24 coils enveloped by a shielded solenoid. The number, positioning, layer construction and conductor structure for each element is carefully designed to minimise magnetic asymmetry, taking persistent current, fabrication tolerances and anti-atom orbits into account.