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Proceedings Paper

Two high-order polynomial bendable mirrors in the TLS infrared beamline
Author(s): Shean-Jen Chen; Chien-Kuang Kuan; Shen-Yaw Perng; Duan-Jen Wang; H. C. Ho; T. C. Tseng; Chien-Te Chen; Yi-Chung Lo
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Paper 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.

Paper Details

Date Published: 25 October 1999
PDF: 8 pages
Proc. SPIE 3775, Accelerator-based Sources of Infrared and Spectroscopic Applications, (25 October 1999); doi: 10.1117/12.366649
Show Author Affiliations
Shean-Jen Chen, Synchrotron Radiation Research Ctr. (Taiwan)
Chien-Kuang Kuan, Synchrotron Radiation Research Ctr. (Taiwan)
Shen-Yaw Perng, Synchrotron Radiation Research Ctr. (Taiwan)
Duan-Jen Wang, Synchrotron Radiation Research Ctr. (Taiwan)
H. C. Ho, Synchrotron Radiation Research Ctr. (Taiwan)
T. C. Tseng, Synchrotron Radiation Research Ctr. (Taiwan)
Chien-Te Chen, Synchrotron Radiation Research Ctr. (Taiwan)
Yi-Chung Lo, Synchrotron Radiation Research Ctr. (Taiwan)

Published in SPIE Proceedings Vol. 3775:
Accelerator-based Sources of Infrared and Spectroscopic Applications
G. Lawrence Carr; Paul Dumas, Editor(s)

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