Coil induced eddy current analysis of a fast kicker magnet
Coil induced eddy current analysis of a fast kicker magnet
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DOI：
10.1016/j.nima.2022.167151
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发表时间：
2022-07
期刊：
影响因子：
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通讯作者：
Wenjie Han;Guanqun Li;B. Qin;X. Liu;Dong Li;Qushan Chen;Geng Chen
中科院分区：
文献类型：
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作者：
Wenjie Han;Guanqun Li;B. Qin;X. Liu;Dong Li;Qushan Chen;Geng Chen
涡流效应是脉冲磁铁设计中的一个重要问题。加速器磁铁中的涡流效应主要是由铁芯和金属支架中的涡流引起的。在我们之前的研究中，我们重点研究了华中科技大学（HUST）快速冲击磁铁的磁轭和金属支撑中的涡流效应。使用OPERA 3D的仿真显示，磁轭和金属支架中的涡流对磁场质量没有显着影响。但在磁场快速变化时，测得的磁场畸变约为±0.4%，需要几百微秒才能消失。此外，很难实现从上升过程到稳态的快速瞬态。本文研究了快冲击磁铁的线圈感应涡流效应，揭示了磁场畸变的主要原因和脉冲电源调试中的难点。考虑线圈感应涡流的设计因素，仿真结果与测量结果吻合较好。基于负载电感的动态性能，可以实现从上升过程到稳态的快速瞬态。研究结果可为此类脉冲磁体及相关电源的设计和优化提供参考，尤其是对具有窗框式磁轭的快速冲击/凸块磁体。
The eddy current effect is an important issue in pulsed magnet design. The eddy currents in the iron cores and the metal supports are proven to be the major causes of the eddy current effects in accelerator magnets. In our previous study, we focused on the eddy current effects in yoke and metal supports of a fast kicker magnet in Huazhong University of Science and Technology (HUST). Simulations using OPERA 3D revealed that eddy currents in yoke and metal supports have no significant influence on the magnetic field quality. However, the measured magnetic field distortion is approximately±0.4% during the fast change of magnetic field, and it takes several hundreds of microseconds to disappear. In addition, it is difficult to achieve a fast transient from the rising process to a steady state. Herein, we investigate the coil induced eddy current effect of a fast kicker magnet and reveal the main reason for the field distortion and the difficulty in the pulsed power supply commissioning. With design considerations of the coil induced eddy current, the simulation results can be in good agreement with the measurement results. Based on the dynamic performance of the load inductance, a fast transient from the rising process to a steady state can be achieved. The research findings can provide a good reference in the design and optimization of such pulsed magnet and associated power supply, especially for the fast kicker/bump magnet with windows frame yoke.