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Proceedings Paper

Application of MEMS-based x-ray optics as tuneable nanosecond choppers
Author(s): Pice Chen; Donald A. Walko; Il Woong Jung; Zhilong Li; Ya Gao; Gopal K. Shenoy; Daniel Lopez; Jin Wang
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Paper Abstract

Time-resolved synchrotron x-ray measurements often rely on using a mechanical chopper to isolate a set of x-ray pulses. We have started the development of micro electromechanical systems (MEMS)-based x-ray optics, as an alternate method to manipulate x-ray beams. In the application of x-ray pulse isolation, we recently achieved a pulse-picking time window of half a nanosecond, which is more than 100 times faster than mechanical choppers can achieve. The MEMS device consists of a comb-drive silicon micromirror, designed for efficiently diffracting an x-ray beam during oscillation. The MEMS devices were operated in Bragg geometry and their oscillation was synchronized to x-ray pulses, with a frequency matching subharmonics of the cycling frequency of x-ray pulses. The microscale structure of the silicon mirror in terms of the curvature and the quality of crystallinity ensures a narrow angular spread of the Bragg reflection. With the discussion of factors determining the diffractive time window, this report showed our approaches to narrow down the time window to half a nanosecond. The short diffractive time window will allow us to select single x-ray pulse out of a train of pulses from synchrotron radiation facilities.

Paper Details

Date Published: 23 August 2017
PDF: 8 pages
Proc. SPIE 10386, Advances in X-Ray/EUV Optics and Components XII, 103860M (23 August 2017); doi: 10.1117/12.2273026
Show Author Affiliations
Pice Chen, Argonne National Lab. (United States)
Donald A. Walko, Argonne National Lab. (United States)
Il Woong Jung, Argonne National Lab. (United States)
Zhilong Li, Argonne National Lab. (United States)
Ya Gao, Argonne National Lab. (United States)
Gopal K. Shenoy, Argonne National Lab. (United States)
Daniel Lopez, Argonne National Lab. (United States)
Jin Wang, Argonne National Lab. (United States)

Published in SPIE Proceedings Vol. 10386:
Advances in X-Ray/EUV Optics and Components XII
Christian Morawe; Ali M. Khounsary; Shunji Goto, Editor(s)

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