Optimization of the design for beamline with fast polarization switching elliptically polarized undulators
Cao, JF; Wang, Y; Zou, Y; Zhang, XZ; Wu, YQ; Tai, RZ; Tai, RZ (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.
2016
发表期刊JOURNAL OF SYNCHROTRON RADIATION
ISSN1600-5775
卷号23期号:-页码:436—442
文章类型期刊文献
摘要Fast switching of X-ray polarization with a lock-in amplifier is a good method for acquiring weak signals from background noise for X-ray magnetic circular dichroism (XMCD) experiments. The usual way to obtain a beam with fast polarization switching is to use two series of elliptically polarized undulators (tandem twin EPUs). The two EPUs generate two individual beams. Each beam has a different polarization and is fast switched into the beamline. It is very important to ensure that the energy resolution, the flux and the spot size at the sample of the two beams are equal in XMCD experiments. However, it is difficult in beamline design because the distances from the two EPUs to the beamline optics are different and the beamline is not switchable. In this work, a beamline design without an entrance slit for fast polarization switching EPUs is discussed. The energy resolution of the two beams can be tuned to be equal by minor rotation of the optics in the monochromator. The flux of the two beams can be balanced through separation blades X, Y in the exit slit, and by adjusting the position of the X blades along the beam. The spot size of the two beams can be adjusted to be equal by shifting the sample as well.
关键词Twin-helical Undulator X-ray Beamline Synchrotron-radiation Insertion Devices Bessy-ii Spring-8 Resolution
DOI10.1107/S160057751600059X
收录类别SCI
语种英语
WOS记录号WOS:000371387900008
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文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/25796
专题中科院上海应用物理研究所2011-2018年
通讯作者Wang, Y; Wu, YQ; Tai, RZ (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.
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Cao, JF,Wang, Y,Zou, Y,et al. Optimization of the design for beamline with fast polarization switching elliptically polarized undulators[J]. JOURNAL OF SYNCHROTRON RADIATION,2016,23(-):436—442.
APA Cao, JF.,Wang, Y.,Zou, Y.,Zhang, XZ.,Wu, YQ.,...&Tai, RZ .(2016).Optimization of the design for beamline with fast polarization switching elliptically polarized undulators.JOURNAL OF SYNCHROTRON RADIATION,23(-),436—442.
MLA Cao, JF,et al."Optimization of the design for beamline with fast polarization switching elliptically polarized undulators".JOURNAL OF SYNCHROTRON RADIATION 23.-(2016):436—442.
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