First neutron data recorded at the V20 Test Instrument utilizing prototype chopper systems and beam monitors planned for ESS

¹ European Spallation Source ERIC (ESS) - P.O. Box 176, SE-22100 Lund, Sweden
² Lund University, Deparment of Physics, Nuclear Physics - P.O. Box 118, SE-22100, Lund, Sweden
³ Science and Technology Facilities Council (STFC), Daresbury Laboratory - Daresbury, UK
⁴ Università degli Studi di Milano-Bicocca - Piazza della Scienza 3, 20126 Milano, Italy
⁵ University of Newcastle, School of Mechanical Engineering - Callaghan, NSW, Australia

^(a) nikolaos.tsapatsaris@esss.se (corresponding author)

Received: 21 August 2019
Accepted: 13 December 2019

Abstract

The main objective of the European Spallation Source (ESS) is to perform consistently high impact neutron scattering science using the highest neutron flux of any facility in its class. This ambition is naturally accompanied by operational challenges related to the vertical integration of the instruments' hardware and software shared between collaborators from 13 European countries. The present work will detail integration tests performed at the V20 Test Instrument at Helmholtz-Zentrum Berlin in Germany. An ESS chopper prototype was successfully controlled through the ESS Chopper Integration Controller (CHIC) and Experimental Physics and Industrial Control System (EPICS). Neutron data were successfully collected and timestamped using neutron beam monitors, the ESS prototype detector readout electronics and the Data Management Software Center (DMSC) data acquisition (DAQ) software. Chopper rotation events were timestamped and the chopper disk showed excellent stability and neutron absorption characteristics. The test resulted in i) the expected time-of-flight (TOF) response, ii) collected data that compared well with instrument reference data and iii) revealing the diagnostic power of the performed integration tests. The results of this integration test validate the ESS chopper and detector DAQ architecture choices.