Author: Sjöström, M.
Paper Title Page
WEPHA012 A General Multiple-Input Multiple-Output Feedback Device in Tango for the MAX IV Accelerators 1084
  • P.J. Bell, V.H. Hardion, M. Lindberg, V. Martos, M. Sjöström
    MAX IV Laboratory, Lund University, Lund, Sweden
  A general multiple-input multiple-output feedback device has been implemented in Tango for various applications in the MAX IV accelerators. The device has a configurable list of sensors and actuators, response matrix inversion, gain and frequency regulation, takes account of the validity of the sensor inputs and may respond to external interlocks. In the storage rings, it performs the slow orbit feedback (SOFB) using the 10 Hz data stream from the Libera Brilliance Plus Beam Position Measurement (BPM) electronics, reading 194 (34) BPMs in the large (small) ring as sensor inputs. The BPM readings are received as Tango events and a corrector-to-BPM response matrix calculation outputs the corrector magnet settings. In the linac, the device is used for the trajectory correction, again with sensor input data sent as Tango events, in this case from the Single Pass BPM electronics. The device is also used for tune feedback in the storage rings, making use of its own polling thread to read the sensors. In the future, a custom SOFB device may be spun off in order to integrate the hardware-based fast orbit feedback, though the general device is also seeing new applications at the beamlines.  
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About • paper received ※ 20 September 2019       paper accepted ※ 08 October 2019       issue date ※ 30 August 2020  
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