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Multi-Grid detector for neutron spectroscopy: results obtained on time-of-flight spectrometer CNCS
European Spallat Source, Sweden.
European Spallat Source, Sweden.
Spallat Neutron Source, TN 37831 USA.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
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2017 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 12, article id P04030Article in journal (Refereed) Published
Abstract [en]

The Multi-Grid detector technology has evolved from the proof-of-principle and characterisation stages. Here we report on the performance of the Multi-Grid detector, the MG. CNCS prototype, which has been installed and tested at the Cold Neutron Chopper Spectrometer, CNCS at SNS. This has allowed a side-by-side comparison to the performance of He-3 detectors on an operational instrument. The demonstrator has an active area of 0.2m(2). It is specifically tailored to the specifications of CNCS. The detector was installed in June 2016 and has operated since then, collecting neutron scattering data in parallel to the He-3 detectors of CNCS. In this paper, we present a comprehensive analysis of this data, in particular on instrument energy resolution, rate capability, background and relative efficiency. Stability, gamma-ray and fast neutron sensitivity have also been investigated. The effect of scattering in the detector components has been measured and provides input to comparison for Monte Carlo simulations. All data is presented in comparison to that measured by the He-3 detectors simultaneously, showing that all features recorded by one detector are also recorded by the other. The energy resolution matches closely. We find that the Multi-Grid is able to match the data collected by He-3, and see an indication of a considerable advantage in the count rate capability. Based on these results, we are confident that the Multi-Grid detector will be capable of producing high quality scientific data on chopper spectrometers utilising the unprecedented neutron flux of the ESS.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2017. Vol. 12, article id P04030
Keywords [en]
Gaseous detectors; Instrumentation for neutron sources; Neutron detectors (cold, thermal, fast neutrons)
National Category
Accelerator Physics and Instrumentation
Identifiers
URN: urn:nbn:se:liu:diva-139638DOI: 10.1088/1748-0221/12/04/P04030ISI: 000405067800030OAI: oai:DiVA.org:liu-139638DiVA, id: diva2:1133707
Note

Funding Agencies|EU BrightnESS project [676548]

Available from: 2017-08-16 Created: 2017-08-16 Last updated: 2017-09-05

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Birch, JensHultman, LarsHöglund, CarinaJensen, JensSchmidt, Susann
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