ISIS Neutron and Muon Source Data Journal
This is a page describing data taken during an experiment at the ISIS Neutron and Muon Source. Information about the ISIS Neutron and Muon Source can be found at https://www.isis.stfc.ac.uk.
Screening of HOPG crystals using TOF neutron transmission for VESPA and TOSCA+
Abstract: The characterisation of highly oriented pyrolytic graphite (HOPG) crystals is part of an ongoing collaboration in neutron instrumentation between the European Spallation Source (ESS) and the ISIS Facility for the development and prototyping of the VESPA (ESS, in construction) and TOSCA+ (ISIS, Endeavour program) instrument projects. The screening and characterisation of HOPG crystals from various suppliers is vital to ensure that nominal performance are achieved on these instruments. We would like to use IMAT to screen 530 HOPG crystals and characterise their mosaic spread, peak reflectivity and direction of the c-axis relative to the cut face of the crystal. All three parameters can be simultaneously obtained from time-of-flight transmission measurement of the (002) reflection of the HOPG, as demonstrated in previous experiments on ALF and IMAT. Thanks to its large 10x10 cm beam and the use of the nGEM position sensitive monitor, up to 34 crystals can be measured simultaneously on IMAT. Furthermore, thanks to IMAT high flux, only short exposure time are required (<1h per bundle of 34 crystals). IMAT is thus the only instrument that allows to screen through this many samples and provide statistically relevant information on the population of HOPG crystals.
Principal Investigator: Dr Adrien Perrichon
Local Contact: Dr Sylvia Britto
Experimenter: Ms Margherita Simoni
Experimenter: Professor Stewart Parker
Experimenter: Dr Monika Hartl
Experimenter: Dr Sam Lambrick
Experimenter: Ms Helen Popland
Experimenter: Dr Davide Raspino
Experimenter: Dr Rob Bewley
Local Contact: Dr Winfried Kockelmann
DOI: 10.5286/ISIS.E.RB2500082
ISIS Experiment Number: RB2500082
| Part DOI | Instrument | Public release date | Download Link |
|---|---|---|---|
| 10.5286/ISIS.E.RB2500082-1 | IMAT | 25 February 2029 | Download |
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 Adrien Perrichon et al; (2026): Screening of HOPG crystals using TOF neutron transmission for VESPA and TOSCA+, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2500082
Data is released under the CC-BY-4.0 license.
