Author: Luvizotto, B.V.
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TUPHA211 XLive: Data Acquisition and Visualization at the NSLS-II ISS Beamline 962
  • B.V. Luvizotto, K. Attenkofer, H. Bassan, E. Stavitski
    BNL, Upton, Long Island, New York, USA
  Asynchronous data acquisition at the Inner-Shell Spectroscopy beamline at NSLS-II is performed using custom FPGA based I/O devices ("pizza-boxes"), which store and time stamp data using GPS based clock {*}. During motor scans, Incremental encoder signals corresponding to motion as well as analog detector signals are stored using EPICS IOCs. As each input creates a file with different timestamps, the data is first interpolated onto a common time grid. The energy scans are performed by a direct-drive monochromator, controlled with a Power PMAC controller. The motion is programmed to follow the trajectory with speed profiles corresponding to desired data density. The "pizza-boxes" that read analog signals are typically set to oversample the data stream, digitally improving the ADC resolution. Then the data is binned onto a energy grid with data spacing driven by desired point spacing. In order to organize everything in an easy-to-use platform, we developed XLive, a Python based GUI application. It can be used from the pre-experiment preparation to the data visualization and exporting, including beamline tuning and data acquisition.
* R. Kadyrov et al., "Encoder Interface For NSLS-II Beam Line Motion Scanning Applications", ICALEPCS'15, Melbourne, Australia, October 2015,
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