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Proceedings Paper

Linear polarizing undulator and optical alignment system for a THz-FEL test facility
Author(s): B. Qin; K.F. Liu; Xu Liu; Xiang Lei; Yangbing Wang; P. Tan; Y. Q. Xiong; W. Wei; Yuanji Pei
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Paper Abstract

A Free Electron Laser oscillator with radiation wavelength 50-100 μm is under commissioning in Huazhong University of Science and Technology (HUST). Physical design of a linear polarizing undulator has been performed in HUST, with variable gap for K=1.0-1.25. The undulator was manufactured by Kyma s.r.l., by using a pure permanent magnet scheme. In December 2014, this undulator was installed in HUST and acceptance test showed main tolerances including rms phase error, field integrals corresponding variable gaps are well controlled. Design considerations related to physical and engineering issues, magnetic field performance are described. This paper introduces the development of an online field integrals measurement system for the undulator, using the stretched wire method. The design and considerations of the optical alignment system is described as well.

Paper Details

Date Published: 12 May 2015
PDF: 8 pages
Proc. SPIE 9512, Advances in X-ray Free-Electron Lasers Instrumentation III, 951202 (12 May 2015); doi: 10.1117/12.2182164
Show Author Affiliations
B. Qin, Huazhong Univ. of Science and Technology (China)
K.F. Liu, Huazhong Univ. of Science and Technology (China)
Xu Liu, Huazhong Univ. of Science and Technology (China)
Xiang Lei, Huazhong Univ. of Science and Technology (China)
Yangbing Wang, Huazhong Univ. of Science and Technology (China)
P. Tan, Huazhong Univ. of Science and Technology (China)
Y. Q. Xiong, Huazhong Univ. of Science and Technology (China)
W. Wei, National Synchrotron Radiation Lab. (China)
Yuanji Pei, Univ. of Science and Technology of China (China)


Published in SPIE Proceedings Vol. 9512:
Advances in X-ray Free-Electron Lasers Instrumentation III
Sandra G. Biedron, Editor(s)

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