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Characterization of a Novel Elliptically Polarized Wiggler

机译:新型椭圆偏振摇摆器的表征

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We report on the initial characterization of an elliptically polarized wiggler built by a collaboration between the Advanced Photon Source, the Budker Institute of Nuclear Physics, and the National Synchrotron Light Source. The wiggler has recently been installed in the X13 straight section of the NSLS X-Ray ring. The device consists of a vertical permanent-magnet wiggler and a horizontal electromagnet wiggler. The electromagnets allow the wiggler to produce on-axis circularly polarized soft x-rays with the capability of AC modulation of the polarization. The maximum switching frequency that can be reached is 100 Hz. The degree of circular polarization of the radiation from the wiggler was characterized by making magnetic circular dichroism measurements using the X13A soft x-ray beamline. For a horizontal deflection parameter, K_x, of 1.6, the dichroism effects at the Fe L_(2,3) edges indicate a degree of circular polarization of approximately 75% using an aperture with a vertical acceptance of 87 μrad. Because both the left- and right-circularly polarized photons traverse identical paths through the beamline optical system, significantly smaller intensity fluctuations associated with switching of the polarization were observed than are typically possible at bending magnet beamlines. This, together with the relatively fast modulation rate, means that it will now be feasible to perform a variety of experiments that have not been possible using bending magnet sources.
机译:我们报告了由高级光子源,布德克核物理研究所和国家同步加速器光源之间的合作建立的椭圆偏振摆动器的初始特性。摇摆器最近安装在NSLS X射线环的X13直线段中。该设备包括一个垂直的永磁摆动器和一个水平的电磁摆动器。电磁体使摆动器能够产生具有交流调制极化能力的同轴圆极化软X射线。可以达到的最大开关频率为100 Hz。通过使用X13A软X射线束线进行磁性圆二色性测量,可以表征来自摆动器的辐射的圆偏振度。对于水平偏转参数K_x为1.6,使用垂直接受度为87μrad的光圈,Fe L_(2,3)边缘的二向色效应表明圆偏振度约为75%。因为左旋和右旋圆偏振光子都通过束线光学系统穿越相同的路径,所以观察到的与偏振转换相关的强度波动要比弯曲磁体束线时典型地小得多。这与相对较快的调制速率一起,意味着现在可以执行使用弯曲磁铁源无法进行的各种实验。

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