上海光源EPU100是一台APPLE-Ⅱ型可变椭圆极化波荡器,其磁结构由四排磁排列组成,其中两排对角线上的磁排列可沿纵向移动,从而产生不同的磁场分布以满足各种极化模式的要求.随着磁排列在纵向上的相对移动,磁排列间的磁力大小和方向会发生变化,从而引起横梁不仅在垂直方向而且在水平方向产生不同的变形.本文通过对不同相位下不同磁力所引起滑动梁的变形进行分析研究,得到与实测变形一致的等效横梁力学模型.%EPU100 at SSRF is an APPLE-Ⅱ type variable elliptically polarized undulator.The magnet structure consists of four magnet arrays with standard Halbach-type.Two arrays at one diagonal can move longitudinally on the rafts so that different magnetic field distributions are shaped to meet the requirements of varieties of polarization modes.With the longitudinal moving of the magnet arrays,the magnitude and the direction of the magnetic forces changed and the distortions of the backing beams both in vertical and horizontal directions will be different.In this paper we analyze and calculate the horizontal displacement of the beams in different gaps and phase shifts to create an equivalent beam mechanical model which is consistent with the measured deformations.
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