Validation of a desktop-type magnet providing a quasi-microgravity space in a room-temperature bore of a high-gradient trapped field magnet (HG-TFM)
Validation of a desktop-type magnet providing a quasi-microgravity space in a room-temperature bore of a high-gradient trapped field magnet (HG-TFM)
复制标题
验证桌面型磁体在高梯度俘获磁场磁体 (HG-TFM) 的室温孔中提供准微重力空间
DOI：
10.1088/1361-6668/ac5fe3
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
H. Fujishiro and M. D. Ainslie
中科院分区：
文献类型：
--
作者：
K. Takahashi;H. Fujishiro and M. D. Ainslie
作者基于数值模拟的结果，于2021年提出了高梯度俘获场磁体（HG-TFM）的概念，该磁体包含两个具有不同功能的（RE）BaCuO超导体块组件的混合系统。HG-TFM作为台式磁体可以更有效地产生B z· dB z/dz（>− 1400 T 2 m− 1，如对纯水计算的）的更高磁场梯度积，这可以在实验室规模上实现适用于空间环境利用的准微重力空间。在本研究中，为了验证HG-TFM中的准微重力空间，已经使用狭缝体TFM和堆叠全TFM构建了HG-TFM原型装置（无狭缝），内径为36 mm。在21 K下从8.60 T场冷磁化后，在中心获得了B T= 8.57 T的捕获场（即在真空室外直径为25 mm的室温孔的底部），因此，最大B z· dB z/dz=-1930 T2 m-1是在狭缝体TFM和堆叠的全TFM之间的中间位置处获得的。成功地证明了铋颗粒和纯水滴的磁悬浮，这验证了HG-TFM中的准微重力环境。基于对囚禁场分布的数值模拟结果，得出悬浮靶不稳定的原因是由于沿着水平面施加的排斥磁力。悬浮状态可以是可控的，例如，通过改变操作温度，这将允许物体沿中心轴线沿着静态悬浮。
The concept of a high-gradient trapped field magnet (HG-TFM), which incorporates a hybrid system of two (RE) BaCuO superconducting bulk components with different functions, was proposed in 2021 by the authors based on the results of numerical simulations. The HG-TFM as a desktop-type magnet can be a more effective way to generate a higher magnetic field gradient product of B z· dB z/dz (>− 1400 T 2 m− 1, as calculated for a pure water), which can realize a quasi-microgravity space applicable for Space Environment Utilization on a laboratory scale. In this study, to validate the quasi-microgravity space in the HG-TFM, a prototype HG-TFM apparatus has been built using a slit-bulk TFM and stacked full-TFM (without slits) with inner diameters of 36 mm. After field-cooled magnetization from 8.60 T at 21 K, a trapped field of B T= 8.57 T was achieved at the center (ie at the bottom of a room temperature bore of 25 mm diameter outside the vacuum chamber), and consequently, a maximum B z· dB z/dz=− 1930 T 2 m− 1 was obtained at the intermediate position between the slit-bulk TFM and the stacked full-TFM. Magnetic levitation was demonstrated successfully for bismuth particles and a pure water drop, which validates the quasi-microgravity environment in the HG-TFM. Based on numerical simulation results of the trapped field profile, it is concluded that the reason for the instability of the levitated targets is because of the repulsive magnetic force applied along the horizontal plane. The levitating state can be controllable, for example, by changing the operating temperature, which would allow objects to levitate statically along the central axis.