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Figure 3
The new collimator. (a) Photograph of the new collimator installed on the diffractometer of BL-17A. (b), (c) Comparison of the horizontal and vertical beam profiles at the sample positions. Gray, red and blue represent the profiles of a full-sized focus beam, a beam defined by a slit and a beam defined by the collimator, respectively. The beam profiles were measured by scanning the beams by using a pinhole 20 µm in diameter at the sample position. Fluxes of the beams defined by the slit and the collimator are 2.2 × 109 and 1.7 × 109 photons s−1, respectively, at 12.6 keV. (d) Comparison of the data collection statistics (solid: I/σ; dash: Rmeas) of a thaumatin crystal. Red and blue indicate the statistics of the data sets collected using the slit or collimator, respectively. The data sets were processed using XDS (Kabsch, 2010BB5).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 20| Part 6| October 2013| Pages 938-942
doi:10.1107/S0909049513022875
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