Author: Sandström, A.
Paper Title Page
MOPGF062
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
 
 
TUB3O03 The Modular Control Concept of the Neutron Scattering Experiments at the European Spallation Source ESS 1
 
  • T. Gahl, R.J. Hall-Wilton, O. Kirstein, T. Korhonen, T.S. Richter, A. Sandström, I. Sutton, J.W. Taylor
    ESS, Copenhagen, Denmark
 
  The European Spallation Source (ESS) in Lund, Sweden has just entered into neutron beam line construction starting detailed design in 2015. As a collaboration of 17 European countries the majority of hardware devices will be provided in-kind. This presents numerous technical and organizational challenges for the construction and the integration of the neutron instrumentation into the facility wide infrastructure; notably the EPICS control network and the facilities absolute timing system. In this contribution we present a strategy for the modularity of the instruments hardware with well-defined standardized functionality and a minimized number of control & data interfaces. Key point of the strategy is the time stamping of all readings from the instruments control electronics extending the event mode data acquisition from detected neutron events to all metadata. This gives the control software the flexibility necessary to adapt the functionality of the instruments to the demands of each single experimental run. Examples of the advantages of that approach in classical motion control as well as in complex robotics systems and matching hardware requirements necessary, is discussed.
* S.Peggs et al., ESS Technical Design Report(ESS-2013-0001, 2013)
** T.Gahl et al., Modularity & Integration of Event Mode Data Acquisition and Instrument Control for ESS, Proc. of ICANS XXI(2015)
 
slides icon Slides TUB3O03 [2.111 MB]