Speaker
Description
In Macromolecular Cystallography (MX) experiments at Diamond Light Source (DLS), crystals are located by scanning samples around a rectangular grid, under synchrotron light, and looking for diffraction. The speeds of these scans have been limited by the position capture unit which co-ordinates trigger signals - the Zebra. Using a Zebra, these scans have historically had a step-like motion, where the goniometer stops at each trigger point before accelerating to the next one. While the detector and goniometer could theoretically support grid scan trigger rates of 500hz, trigger points became too inaccurate to use beyond a 250hz scan. The PandABox, with its larger FPGA and faster data transfer, can handle a constant speed scan motion, where the goniometer continuously travels across each row while triggers are sent. With this new motion, the grid scans can be performed at maximum goniometer speeds and minimum detector exposure times – doubling the frame rate of grid scans to 500hz, thus increasing the overall throughput of the beamline. This talk will discuss how the PandA has been exploited to design these new grid scans and its integration with the data acquisition software
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