Author: Holmberg, N.
Paper Title Page
A Generic Approach for Integration of Neutron Choppers into the Integrated Control System of the European Spallation Source ESS  
  • N. Holmberg, T. Gahl, O. Kirstein, T. Korhonen, M. Reščič, A. Sandström, I. Sutton
    ESS, Lund, Sweden
  • P. Galsworthy
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • W.M. McHargue
    ORNL, Oak Ridge, Tennessee, USA
  The European Spallation Source (ESS) in Lund, Sweden has just entered the beam line construction phase with 3 neutron instruments. As a collaboration of 17 European countries, numerous technical and organizational challenges arise for the construction and the integration of the instruments into the facility wide infrastructure*. We present a strategy for integration of multiple types of neutron choppers, both in-kind contributed and commercially procured devices, into the facility infrastructure; mainly with interfaces to the central EPICS data network and the facility timing system. A key point is the low level conversion of the data flow, to and from the central control system, into a generic structure, to make different types of neutron choppers look identical from above network layers. The use of event time-stamping and reduction of low level device interfaces increases the amount of usable experiment data through passing data discard decisions to more advanced experiment data processing units at higher levels in the experiment control system**. We present the advantages of this approach in terms of standardization and flexibility for commissioning, maintenance and monitoring.
*Peggs et al, ESS Technical Design Report, ESS-2013-0001(2013)**Gahl et al, Hardware Aspects, Modularity and Integration of an Event Mode Data Acquisition and Instrument Control for the ESS, ICANS XXI