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The performance of neutron diffractometers at long and short pulse spallation sources: Comparison between ESS and J-PARC

Authors :
Masatoshi Arai
L. Zanini
Werner Schweika
Stefanus Harjo
Takashi Kamiyama
Dimitri N. Argyriou
Ken H. Andersen
Masahide Harada
Source :
Journal of Neutron Research. 23:215-232
Publication Year :
2021
Publisher :
IOS Press, 2021.

Abstract

The general performance of diffractometers at the first long pulse spallation source ESS, is compared with their counterparts at J-PARC, a short pulse spallation source. The difference in the inherent pulse structure of these neutron sources presents opportunities for new concepts for instrumentation, where performance does not scale simply with source power. The article describes advantages and disadvantages of those diffractometers, adapting to the very different source characteristics. We find that the two sources offer comparable performance in flux and resolution when operating in high-resolution mode. ESS offers significant advantages in tunability and flexibility, notably in the ability to relax resolution in order to increase flux for a given experiment. The slow repetition rate of ESS favors long instruments. On the other hand, J-PARC instruments perform very well in spite of the lower source power and allow better access to epithermal neutrons, of particular interest for PDF analysis of diffraction data.

Details

ISSN :
14772655 and 10238166
Volume :
23
Database :
OpenAIRE
Journal :
Journal of Neutron Research
Accession number :
edsair.doi...........6044fa39c2902c176da51f34068f124c