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- W1969135215 abstract "The stability of the particle beam position and angle on third generation synchrotron sources such as the Advanced Photon Source (APS) at Argonne National Laboratory is extremely good. However, because of the long length of beamlines (50–70 m) at such sources, small perturbations of the particle beam angle can result in undesirable beam movement in the experimental end station. Additionally, instabilities in the beamline optics may also result in beam movement. At the BioCAT undulator source beamline at the APS, we have employed an x-ray beam position monitor (BPM) [R. Alkire, G. Rosenbaum, and G. Evans, J. Synchrotron Radiat. 7, 61 (2000)] in the experimental station at 61 m from the source to record the real time beam position in both the horizontal and vertical directions. A comparison of the rf-BPM in the storage ring and the x-ray BPM in the beamline confirm that positional changes of ±20 μm in the experimental end station can be traced to angular changes of ±0.3 μrad in the particle beam angle. Motion on this scale is particularly undesirable for small angle and solution scattering experiments that require small focal sizes on the order of 50 μm and positional stability on the order of 5 μm. In this article we demonstrate that the vertical beam position can be stabilizing to better than ±1 μm at distances of 60–70 m from the source. This was accomplished by using the position output in a closed loop feedback system to drive a piezo translator effecting the Bragg angle of the second crystal of the double crystal monochromator." @default.
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- W1969135215 date "2002-03-01" @default.
- W1969135215 modified "2023-09-23" @default.
- W1969135215 title "Submicron stabilization of the x-ray beam position on long beamlines (abstract)" @default.
- W1969135215 cites W2126419837 @default.
- W1969135215 doi "https://doi.org/10.1063/1.1448159" @default.
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