Mechanical Design of FECD1 at IHEP: A 12-T Hybrid Common-Coil Dipole Magnet
Mechanical Design of FECD1 at IHEP: A 12-T Hybrid Common-Coil Dipole Magnet
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DOI：
10.1109/tasc.2016.2642980
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发表时间：
2016-12
影响因子：
1.8
通讯作者：
Kai Zhang;Chengtao Wang;Qingjin Xu;Zian Zhu;Yingzhe Wang;D. Cheng;Ershuai Kong;F. Ning;
中科院分区：
文献类型：
--
作者：
Kai Zhang;Chengtao Wang;Qingjin Xu;Zian Zhu;Yingzhe Wang;D. Cheng;Ershuai Kong;F. Ning;
一个外径为720 mm的12 T Nb 3Sn/NbTi共线圈偶极磁体正在开发中，作为超级质子-质子对撞机所需的最终20 T加速器偶极磁体的第一个研发步骤。这种扁端共线圈双极磁铁是基于外壳支撑结构与囊&关键技术。在工作电流为3,970 A时，Nb_3Sn内线圈的设计峰值磁场为12 T，在4.2 K时的裕度为18.4%。优化了线圈结构，提高了水平预紧力和中心磁场的传递效率。铝合金拉杆用于向线圈施加轴向预紧力。当壳体厚度为60 mm且摩擦系数为0.2时，整个偶极磁体中的应力低于可接受的水平。激励后线圈位移小于8 μm。进一步的分析表明，较大的壳体厚度会增加冷缩力，较大的摩擦系数值会导致线圈峰值应力的升高。
A 12-T Nb3Sn/NbTi common-coil dipole magnet with the outer diameter of 720 mm is under development as the first R&D step towards the final 20-T accelerator dipole magnet which is required in the Super proton-proton Collider. This Flat End Common-coil Dipole magnet is based on the shell support structure with the bladder & key technology. The designed peak field is 12-T in the Nb3Sn inner coil at the operating current of 3,970 A, with a margin of 18.4% at 4.2 K. The coil structure is optimized to enhance the transfer efficiency of horizontal preload and the central magnetic field. The aluminum alloy tie rod is used to apply axial preload to the coils. The stress in the whole dipole magnet is below an acceptable level when the shell thickness is 60 mm and the friction coefficient is 0.2. The coil displacement after excitation is below 8 μm. Further analysis indicates that a larger shell thickness may increase the cold shrinking force and a larger friction coefficient value can lead to the rise of peak coil stress.