Confined-walking mode for an elliptical polarized undulator and its application

doi:10.1107/S1600577519013286

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Confined-walking mode for an elliptical polarized undulator and its application
	Zou, Y ; Zhang, QL ; Zhang, JD ; Zhuo, JW ; Jiang, GY ; Liu, P ; Jiang, BC ; Zheng, LF ; Zhou, QG ; Yin, LX
刊名	JOURNAL OF SYNCHROTRON RADIATION
	2019
卷号	26 页码:1911-1916
ISSN号	0909-0495
DOI	10.1107/S1600577519013286
文献子类	期刊论文
英文摘要	Elliptical polarized undulators (EPUs) are broadly used in the soft X-ray energy range. They have the advantage of providing photons with both varied energy and polarization through adjustments to the value of the gap and/or shift magnet arrays in an undulator. Yet these adjustments may create a disturbance on the stability of the electron beam in a storage ring. To correct such a disturbance, it is necessary to establish a feed-forward table of key nodes in the gap-shift-defined two-dimensional parameter space. Such a table can only be scanned during machine-study time. For a free-walking mode, whereby an undulator is allowed to manoeuvre in the whole gap-shift space, all the key nodes need to be scanned at the expense of a large amount of machine-study time. This will greatly delay the employment of a full-polarization capable undulator (especially circularly polarized). By analyzing data-collecting patterns of user experiments, this paper defines a reduced set of key nodes in gap-shift parameter space, with the number of key nodes to be scanned for feed-forwarding scaled down to one-third of the original; and introduces a new walking mode for EPUs: confined-walking mode, whereby the undulator is manoeuvred only within the reduced set of key nodes. Such a mode is firstly realized on the EPUs at the DREAMLINE beamline at Shanghai Synchrotron Radiation Facility (SSRF). Under confined-walking mode, the undulator movements are stable and there is no obvious disturbance to the electron beam with the feed-forward system in operation. Successful experiments have been carried out using the circularly polarized light obtained via the new walking mode. This mode is expected to be applied to future EPUs at SSRF with the increasing requirements for various polarization modes.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/32006]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Chinese Acad Sci, Shanghai Inst Appl Phys, 239 Zhangheng Rd, Shanghai 201204, Peoples R China; 2.Shanghai Xiangou Automat Syst CO, 988 Datong Rd B-2003, Shanghai 200070, Peoples R China 3.Chinese Acad Sci, SARI, SSRF, 239 Zhangheng Rd, Shanghai 201210, Peoples R China;
推荐引用方式 GB/T 7714	Zou, Y,Zhang, QL,Zhang, JD,et al. Confined-walking mode for an elliptical polarized undulator and its application[J]. JOURNAL OF SYNCHROTRON RADIATION,2019,26:1911-1916.
APA	Zou, Y.,Zhang, QL.,Zhang, JD.,Zhuo, JW.,Jiang, GY.,...&Tai, RZ.(2019).Confined-walking mode for an elliptical polarized undulator and its application.JOURNAL OF SYNCHROTRON RADIATION,26,1911-1916.
MLA	Zou, Y,et al."Confined-walking mode for an elliptical polarized undulator and its application".JOURNAL OF SYNCHROTRON RADIATION 26(2019):1911-1916.