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题名:
Optimization of the design for beamline with fast polarization switching elliptically polarized undulators
作者: Cao, JF; Wang, Y; Zou, Y; Zhang, XZ; Wu, YQ; Tai, RZ
刊名: JOURNAL OF SYNCHROTRON RADIATION
出版日期: 2016
卷号: 23, 期号:-, 页码:436—442
关键词: TWIN-HELICAL UNDULATOR ; X-RAY BEAMLINE ; SYNCHROTRON-RADIATION ; INSERTION DEVICES ; BESSY-II ; SPRING-8 ; RESOLUTION
DOI: 10.1107/S160057751600059X
通讯作者: Wang, Y ; Wu, YQ ; Tai, RZ (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.
文章类型: 期刊文献
英文摘要: 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.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000371387900008
ISSN号: 1600-5775
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/25796
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
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,2016-01-01,23(-):436—442.
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文件名: Optimization of the design for beamline with fast polarization switching elliptically polarized undulators.pdf
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