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上海光源二期工程正在设计一个新的磁聚焦结构,它包含双斜插入件、超导二极铁以及超导扭摆器等新的元件。光谱亮度是表征同步辐射光源性能的一个重要参数,通过降低垂直发射度的方式来提高亮度是一种简便可行的方法。首先分别模拟和计算了各类磁铁准直误差对垂直发射度的影响,然后采用奇值分解法校正了误差引起的闭轨畸变,最后使用60个斜四极铁来校正垂直发射度。结果表明,在上海光源二期工程的磁铁准直公差与目前正在运行的上海光源相同的条件下,六极铁垂直准直误差对垂直发射度的影响最大;用60个斜四极铁来校正垂直发射度,能使耦合度保持在0.5%以下。
Shanghai Light Source Phase II is designing a new magnetic focusing structure that incorporates new components such as double-slanted inserts, superconducting diodes, and superconducting wiggles. Spectral brightness is an important parameter to characterize the performance of synchrotron light sources. It is a simple and feasible method to increase the brightness by reducing the vertical emissivity. First of all, the effects of various types of magnet collimation errors on vertical emissivity were simulated and calculated respectively. Then the odd-value decomposition method was used to correct the error caused by the closed-track distortion. Finally, 60 oblique quadrupoles were used to correct the vertical emissivities. The results show that the vertical alignment error of the hexagonal pole has the greatest influence on the vertical emissivity under the same conditions of the magnet collimation tolerance of Shanghai Light Source Phase II Project and the Shanghai Light Source currently in operation; and 60 oblique quadrupoles Vertical emittance, can make the coupling degree keep below 0.5%.