25 October 1999 Two high-order polynomial bendable mirrors in the TLS infrared beamline
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Abstract
This study presents a Kirkpatrick-Baez mirror system which includes two high-order polynomial bendable mirrors in a Taiwan Light Source (TLS) infrared beamline to create and adjust more accurately collimating images on a focusing point. The source of infrared rays is synchrotron radiation from a TLS bending magnet, so the surface of a vertical focusing mirror (VFM) is designed on an elliptical shape. The Runge-Kutta numerical method is used to compute the optimal high-order polynomial shape of the horizontal focusing mirror (HFM), to focus the horizontal arc source on the point image. The HFM and VFM using 17-4 PH stainless steel substrate without an electroless nickel plate are mechanically bent from planar to the desired fifth-order polynomial shapes with central radii of 3.74 m and 5.43 m by the application of equal couples, respectively. The mirror fabrication process, mechanical design, and the method of adjusting the mirror shape using the Long Trace Profiler measurement system are described. Finally, the roughness of mirrors is 3 angstrom RMS. After the mirrors have been bent, the slope error over 2/3 of clear aperture length (170 mm) was reduced to less than 6.3 (mu) rad RMS.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Shean-Jen Chen, Shean-Jen Chen, Chien-Kuang Kuan, Chien-Kuang Kuan, Shen-Yaw Perng, Shen-Yaw Perng, Duan-Jen Wang, Duan-Jen Wang, H. C. Ho, H. C. Ho, T. C. Tseng, T. C. Tseng, Chien-Te Chen, Chien-Te Chen, Yi-Chung Lo, Yi-Chung Lo, } "Two high-order polynomial bendable mirrors in the TLS infrared beamline", Proc. SPIE 3775, Accelerator-based Sources of Infrared and Spectroscopic Applications, (25 October 1999); doi: 10.1117/12.366649; https://doi.org/10.1117/12.366649
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