Eddy current analysis and optimization of fast scanning magnet for a proton therapy system
Eddy current analysis and optimization of fast scanning magnet for a proton therapy system
复制标题
质子治疗系统快速扫描磁体的涡流分析与优化
DOI：
10.1016/j.nima.2017.05.009
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发表时间：
2017-08
期刊：
影响因子：
--
通讯作者：
刘开锋
中科院分区：
文献类型：
--
作者：
刘旭;秦斌;刘开锋
质子治疗现在被认为是治疗癌症最有效的放射治疗方法之一。华中科技大学正在开发一种基于等时超导回旋加速器方案的多龙门治疗室质子治疗设备。在束流线中，扫描系统通过两块扫描磁体将质子束根据复杂的肿瘤形状在靶上展开，分别进行水平和垂直扫描。由于这两个磁体是由交流电激发的，并且最大重复频率高达100赫兹，因此涡流和损耗预计会很大。事实证明，开缝是一种有效的减小涡流的方法。为了评估扫描磁体极端涡流损耗引起的热分布，进行了瞬态电磁分析和稳态热分析。介绍了扫描系统的设计思想，重点分析了扫描磁体的涡流效应。对不同的线圈形状和狭缝布置进行了模拟和比较，以获得最佳配置。两个磁体的最高温度在70°C以下优化。此外，还讨论了涡流引起的滞后效应。
Proton therapy is now recognized as one of the most effective radiation therapy methods for cancers. A proton therapy facility with multiple gantry treatment rooms is under development in HUST (Huazhong University of Science and Technology), which is based on isochronous superconducting cyclotron scheme. In the beam line, the scanning system spreads out the proton beam on the target according to the complex tumour shape by two scanning magnets for horizontal and vertical scanning independently. Since these two magnets are excited by alternating currents and the maximum repetition frequency is up to 100 Hz, eddy currents and losses are expected to be significant. Slits are proven to be an effective way to reduce the eddy currents. To evaluate the heat distribution due to eddy losses in the pole end of the scanning magnet, the transient electromagnetic analysis and steady-state thermal analysis are performed. This paper describes design considerations of the scanning system and mainly analyses the eddy current effect of the scanning magnets. Different coil shapes and slit arrangements are simulated and compared to obtain the optimal configuration. The maximum temperatures of two magnets are optimized below 70 °C. In addition, the lag effect due to eddy currents is also discussed.
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