A new support structure for high field magnets
A new support structure for high field magnets
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DOI：
10.1109/tasc.2002.1018349
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发表时间：
2002-08
影响因子：
1.8
通讯作者：
R. Hafalia;P. Bish;S. Caspi;D. Dietderich;S. Gourlay;R. Hannaford;A. Lietzke;N. Liggins;A. Mci
中科院分区：
文献类型：
--
作者：
R. Hafalia;P. Bish;S. Caspi;D. Dietderich;S. Gourlay;R. Hannaford;A. Lietzke;N. Liggins;A. Mci
超导磁体的预应力可以通过磁轭结构直接施加。我们已经用基于铝外壳和囊状物的组装程序取代了14特斯拉研发Nb/sub 3/Sn偶极磁体中的套环功能。放置在外壳内线圈组和周围轭之间的气囊被加压至10 ksi [70 MPa]，以产生干涉间隙。插入干涉间隙的键取代了气囊功能。在组装之后，气囊被放气并移除。直接安装在外壳上的应变片用于监测整个磁体结构的应力，从而提供高度的预应力控制，而无需高公差。在组装过程中，气囊产生8.2 /spl times/ 10/sup 5/ lbs/ft [12 MN/m]的力，1.57”[40 mm]铝壳中的应力达到20.3 ksi [140 MPa]。在冷却期间，外壳和轭之间的热膨胀差异产生6.85 /spl times/ 10/sup 5/ lbs/ft [10 MN/m]的额外压缩力，对应于外壳中39.2 ksi [270 MPa]的最终应力。在线圈在孔处分离之前，预应力条件足以承受16 T。囊袋现已用于两个14 T磁体的组装和拆卸。本文介绍了磁铁的结构、装配过程和试验结果。
Pre-stress of superconducting magnets can be applied directly through the magnet yoke structure. We have replaced the collar functionality in our 14 Tesla R&D Nb/sub 3/Sn dipole magnets with an assembly procedure based on an aluminum shell and bladders. Bladders, placed between the coil pack and surrounding yoke inside the shell, are pressurized up to 10 ksi [70 MPa] to create an interference gap. Keys placed into the interference gap replace the bladder functionality. Following the assembly, the bladders are deflated and removed. Strain gauges mounted directly on the shell are used to monitor the stress of the entire magnet structure, thereby providing a high degree of pre-stress control without the need for high tolerances. During assembly, a force of 8.2 /spl times/ 10/sup 5/ lbs/ft [12 MN/m] is generated by the bladders and the stress in the 1.57" [40 mm] aluminum shell reaches 20.3 ksi [140 MPa]. During cool-down the thermal expansion difference between shell and yoke generates an additional compressive force of 6.85 /spl times/ 10/sup 5/ lbs/ft [10 MN/m], corresponding to a final stress in the shell of 39.2 ksi [270 MPa]. Pre-stress conditions are sufficient for 16 T before the coils separate at the bore. Bladders have now been used in the assembly and disassembly of two 14 T magnets. This paper describes the magnet structure, assembly procedure and test results.