Paper | Title | Page |
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WEPE40 | Two-rotation Mechanism for an in Vacuum Beamstop | 378 |
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At Small-angle X-ray Scattering beamlines (SAXS), beamstops are needed to block the intense primary beam that has not been scattered by the sample in order to protect the detector from any damage. Beamstops are usually confined inside a vacuum tube minimizing air space between the sample and the detector. For certain experiments, a motorized beamstop is required to achieve a precise positioning in different regions of the detector active area. ALBA has developed a new motorized beamstop* consisting of a two-rotation mechanism inside vacuum that composes a movement able to cover all range of the active area of the detector. The presented solution involves a main rotation reached by a gear and a worm drive actuated by a stepper motor and a second rotation relative to the main one produced by a piezo rotation stage. For each position appears two different solutions. This characteristic permits take two equivalent images in the detector with the same beamstop position but different orientation in the beamstop support; thus permitting the compensation of the support shadow on the active area of the detector.
* Patent Registered |
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Poster WEPE40 [2.217 MB] | |
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-WEPE40 | |
About • | paper received ※ 08 September 2016 paper accepted ※ 16 September 2016 issue date ※ 22 June 2017 | |
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