Author: Stanton, D.
Paper Title Page
WEPHA119 Asynchronous Driver Evaluation and Development for Digital Systems at the Argonne Tandem Linear Accelerating System 1368
  • C.E. Peters, J. Reyna, D. Stanton
    ANL, Lemont, Illinois, USA
  Funding: This work was supported by the U.S. DOE, Office of Nuclear Physics, under Contract DE-AC02-06CH11357. The research used resources of ANL’s ATLAS Facility, a DOE Office of Science User Facility.
The ATLAS (Argonne Tandem Linear Accelerating System) accelerator at Argonne National Laboratory, near Chicago, IL., has recently been upgraded via the addition of a pulsed mode Electron Beam Ion Source (EBIS). Pulsed operation requires finer levels of control of various digital systems like fast switching high-voltage power supplies and remotely controlled function generators. Additionally, pico-level and femto-level ammeters need per-device zero correction and calibration to accurately read beam intensities. As the facility moves away from fast register-based analog signals, new and slower digital protocols adversely affect the perceived execution time of the control system. This work presents options, research, and results of implementing an asynchronous layer between high level user interfaces and the low level communication drivers in order to increase the perceived responsiveness of the system. Solutions are evaluated ranging from in-house codes, which implement system-wide mutual exclusion and prioritization, to drivers available from the EPICS control system. Key performance criteria include ease of implementation, cross platform availability, and overall robustness.
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About • paper received ※ 30 September 2019       paper accepted ※ 09 October 2019       issue date ※ 30 August 2020  
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