ISIS Neutron and Muon Source Data Journal

Performance test of the DREAM bi-spectral switch

Abstract: DREAM is a diffractometer instrument that will be built at the European Spallation Source (ESS). DREAM will view both the cold and thermal moderators of ESS, thus a bi-spectral extraction system will be used to run experiments with a large wavelength band. The system has to enable reflections of neutrons from the cold moderator while being optimized for transmitting neutrons from the thermal moderator. The device consists of nominal 153 Si wafers with a thickness of 0.13 mm with a NiTi super mirror coating (m-value 3). The wafers are inclined by 0.57° to the instrument (thermal) beam axis. The angular tolerance is ±0.05°. The performance of the Si-wafer stack has been validated by simulations. The bi-spectral switch installation will be done in Q2 2022 inside the ESS bunker, thus testing the device with the thermal neutrons before the installation is time-critical.

Principal Investigator: Dr Mikhail Feygenson
Experimenter: Dr Artem Feoktystov
Experimenter: Dr Earl Babcock
Experimenter: Dr Steven Parnell
Experimenter: Dr Celine Durniak
Local Contact: Dr Winfried Kockelmann
Experimenter: Dr Christine Klauser
Experimenter: Dr Werner Schweika
Experimenter: Dr Irina Stefanescu

DOI: 10.5286/ISIS.E.RB2210085

ISIS Experiment Number: RB2210085

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Dr Mikhail Feygenson et al; (2022): Performance test of the DREAM bi-spectral switch, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2210085

Data is released under the CC-BY-4.0 license.