In continuous mode data collection, the spindle axis is rotated at constant speed with the shutter opening and closing at specific motor positions to select which rotation ranges are recorded with a CCD detector. The objective is to minimize overall system overhead as exposure time per image becomes small (less than one second); this overhead should be closely related to the CCD detector readout speed. An example would be collecting every second or third image possible while performing two or three passes to complete a data set. Contrast this with traditional goniometer start/stop data collection where overhead is detector readout plus a goniometer overhead which increases as exposure time decreases. Methodology and characterizations necessary for implementing continuous mode data collection in general are described as well as some preliminary implementation results at the SBC and NECAT beam lines at the APS.
Abstract File: abstract00113.txt
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