Design of a 7 T Superconducting Magnet for Lanzhou Penning Trap
Design of a 7 T Superconducting Magnet for Lanzhou Penning Trap
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DOI：
10.1109/tasc.2010.2040957
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发表时间：
2010-03
影响因子：
1.8
通讯作者：
W. Wu;Y. He;L. Ma;W. X. Huang;Q. Yao;X. Wu;B. Guo;B. Zhang;P. Yuan;J. Xia
中科院分区：
文献类型：
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作者：
W. Wu;Y. He;L. Ma;W. X. Huang;Q. Yao;X. Wu;B. Guo;B. Zhang;P. Yuan;J. Xia
兰州彭宁阱是中国科学院近代物理研究所正在研制的用于精确质量测量的彭宁阱系统。LPT最关键的部件是超导磁体。捕获离子和测量需要156 mm的暖孔和两个距离为220 mm的圆柱形良好场区域。由于所需的均匀性优于0.5ppm，因此使用几个复杂的同轴线圈来产生这样的磁场。采用线性规划和多目标优化相结合的方法对线圈的尺寸和位置进行了优化。超导匀场线圈和无源匀场片用于消除不可避免的绕组公差和环境影响。在距磁体中心2m处，通过有源屏蔽线圈将边缘磁场降低到5Gs。介绍了机械结构、失超保护系统的设计.
A penning trap system called LPT (LANZHOU PENNING TRAP) is now being developed for precise mass measurements in IMP (Institute of Modern Physics). The most key component of LPT is a superconducting magnet. A 156 mm warm bore and two cylinder good field regions with a distance of 220 mm are required for trapping ions and measurements. As the required homogeneity is better than 0.5 ppm, several complicated coaxial coils are used to produce such a magnetic field. The size and position of these coils are optimized by using a method combining linear program with multiobjective optimization. Superconducting shim coils and passive shim pieces are used to eliminate inevitable winding tolerances and environmental influence. The fringe field is decreased to 5 Gs at 2 m line from the center of the magnet by active shielding coils. The designs of the mechanical structure, the quench protection system are also introduced in this paper.