23 August 2017 Application of MEMS-based x-ray optics as tuneable nanosecond choppers
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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.
Conference Presentation
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Pice Chen, Donald A. Walko, Il Woong Jung, Zhilong Li, Ya Gao, Gopal K. Shenoy, Daniel Lopez, Jin Wang, "Application of MEMS-based x-ray optics as tuneable nanosecond choppers", Proc. SPIE 10386, Advances in X-Ray/EUV Optics and Components XII, 103860M (23 August 2017); doi: 10.1117/12.2273026; https://doi.org/10.1117/12.2273026
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