上海深紫外自由电子激光波荡器的端部磁结构设计
Design of end magnetic structures for Shanghai DUV-FEL hybrid undulators
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摘要: 针对固定间隙的上海深紫外自由电子激光（SDUV-FEL）混合型波荡器的端部，用Radia程序进行了模拟计算。在端部不加任何电磁线圈补偿的情况下，通过减小端部磁铁、磁极的体积和变动端部磁极位置的方法对波荡器磁场进行了优化，优化以后波荡器横向磁场的边缘场强度降到5×10-4 T（距离端部磁块边缘10 mm处），边缘场波形没有了明显突起，优化后的横向磁场的一次积分曲线和二次积分曲线都有很大改善，端口处的一次积分值、二次积分值接近于零。Abstract: Design of end magnetic structures for a hybrid undulator is very complicated. In this article, magnetic field calculation was carried out using the "Radia" code, aimed to optimize the end magnetic structures for the Shanghai DUV-FEL hybrid undulator with a fixed gap. Without electromagnet correction, the first and second field integrals of the hybrid undulator were almost zero by reducing sizes of the two final magnets and positioning the two end poles. After the shield was added outside the final magnet, the fringe fields were lower than 5×10‑4 T off 10 mm to the final magnet．
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Key words:
- hybrid undulator /
- design of end magnetic structure /
- fringe field /
- free electron laser
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