@inproceedings{625587351d64425bbf774d0b0164ac7e,
title = "A novel, 1 m long multilayer-coated piezo deformable bimorph mirror for focusing high-energy x-rays",
abstract = "The X-ray pair distribution function beamline I15-1 at Diamond Light Source requires optical elements that focus a wiggler X-ray beam of high energy (40-80 keV) and large area (11.0 mm × 4.4 mm) into a small spot (FWHM∼700 μm (h) × 20 μm (v)) at a variable distance between sample and detector. X-ray lenses do not reach the necessary effective apertures because of absorption and the limits of fabrication technology. The aperture of conventional silicon X-ray mirrors, even with metal coatings, is likewise limited by the shallow critical angle for high-energy X-rays. As a solution, CINEL Strumenti Scientifici delivered the first multilayer-coated bimorph mirror for use at a synchrotron beamline. A silicon substrate was polished by Thales-SESO to have an elliptically curved surface. The mirror was then coated with three multilayer stripes (Ni/B4C, W/B4C, Pt/B4C) of unmatched 1 m length by Rigaku Innovative Technologies. Each stripe's d-spacing was chosen so that the Bragg angle of its first-order reflection would occur at 4.2 mrad at the center of the mirror. Moreover, each stripe's d-spacing was graded along the mirror's length to ensure high reflectivity from the whole stripe. Piezoelectric actuators were then glued to the sides of the coated substrate by Thales-SESO to convert it to a bimorph deformable mirror. This enables the mirror to vary its focusing distance from 3.6 m to 4.8 m, and to compensate for residual long-wavelength slope errors. The mirror's capability to provide vertical focusing exceeding specifications was demonstrated by ex-situ metrology and in-situ X-ray measurements. Representative results are presented.",
author = "Sutter, {John P.} and Chater, {Philip A.} and Riccardo Signorato and Keeble, {Dean S.} and Hillman, {Michael R.} and Tucker, {Matthew G.} and Alcock, {Simon G.} and Ioana Nistea and Heribert Wilhelm",
note = "Publisher Copyright: {\textcopyright} 2019 Author(s).; 13th International Conference on Synchrotron Radiation Instrumentation, SRI 2018 ; Conference date: 11-06-2018 Through 15-06-2018",
year = "2019",
month = jan,
day = "15",
doi = "10.1063/1.5084568",
language = "English",
series = "AIP Conference Proceedings",
publisher = "American Institute of Physics Inc.",
editor = "Shangjr Gwo and Tzu-Hung Chuang and Yao-Chang Lee and Chainani, {Ashish Atma} and Yu-Chun Chuang and Chun-Chieh Wang and Di-Jing Huang and Der-Hsin Wei and Gwo-Huei Luo and Jyh-Fu Lee and Hong-Ji Lin and Gung-Chian Ying and Cheng-Maw Cheng and Jhih-Min Lin and Jin-Ming Chen and Ping-Jung Chou and Ching-Shiang Huang and Yaw-Wen Yang and U-Ser Jeng and Chin-Cheng Kuo and Hwo-Shuenn Sheu and Shih-Chun Chung and Wai-Keung Lau and Hsin-Yi Lee and Mau-Tsu Tang",
booktitle = "Proceedings of the 13th International Conference on Synchrotron Radiation Instrumentation, SRI 2018",
}