A small and robust active beamstop for scattering experiments on high-brilliance undulator beamlines

Journal of Synchrotron Radiation
Clement E BlanchetStefan Fiedler

Abstract

A small active in-vacuum beamstop has been developed to monitor the flux of intense third-generation synchrotron X-ray beams protecting the downstream detector from the direct beam. Standard active beamstops, where a built-in diode directly absorbs the beam, have limitations in size and lifetime. In the present design, a silicon PIN diode detects the photons back-scattered from a cavity in the beamstop. This approach drastically reduces the radiation dose on the diode and thus increases its lifetime. The beamstop with a diameter of 2 mm has been fabricated to meet the requirements for the P12 bioSAXS beamline of EMBL Hamburg at PETRA III (DESY). The beamstop is in regular user operation at the beamline and displays a good response over the range of energies tested (6-20 keV). Further miniaturization of the diode is easily possible as its size is not limited by the PIN diode used.

References

Apr 26, 2003·Journal of Synchrotron Radiation·Paul J EllisS Michael Soltis
Feb 26, 2009·Journal of Synchrotron Radiation·Robin L OwenElspeth F Garman
Aug 9, 2011·Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment·Ulrich EnglichWilliam Miller

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Citations

May 27, 2016·The Journal of Biological Chemistry·Marco Igor Valencia-SánchezAlfredo Torres-Larios
Apr 10, 2021·Journal of Applied Crystallography·Petr V KonarevDmitri I Svergun
May 6, 2021·Journal of Synchrotron Radiation·Andrey Yu GruzinovClement E Blanchet
Jul 1, 2021·Journal of Applied Crystallography·D C F WielandD I Svergun
Jul 11, 2021·The Review of Scientific Instruments·K DesjardinsJ Pérez

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Methods Mentioned

BETA
X-ray

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