ISIS NeXus Data
NeXus is a common data format for neutron, x-ray and muon science. It is developed as an international standard by scientists and programmers representing major scientific facilities in Europe, Asia, Australia, and North America in order to facilitate greater cooperation in the analysis and visualisation of neutron, x-ray and muon data.
This particular collection of NeXus files are scientific data, it is generated from ISIS in the Science and Technology Facilities Council. ISIS produces beams of neutrons and muons that allow scientists to study materials at the atomic level using a suite of instruments, often described as ‘super-microscopes’. It supports a national and international community of more than 2000 scientists who use neutrons and muons for research in physics, chemistry, materials science, geology, engineering and biology. It is the most productive research centre of its type in the world.
NeXus data files contain four types of entity: data groups, data fields, attributes, and links.
Data groups are like folders that can contain a number of fields and/or other groups.
Data fields can be scalar values or multidimensional arrays of a variety of sizes (1-byte, 2-byte, 4-byte, 8-byte) and types (characters, integers, floats). In HDF, fields are represented as HDF Scientific Data Sets (also known as SDS).
Extra information required to describe a particular group or field, such as the data units, can be stored as a data attribute.
Links are used to reference the plottable data from NXdata when the data is provided in other groups such as NXmonitor or NXdetector.
Example of a NeXus file
ISIS data management policy ( the full policy is available online here )
1. General principles
1.1 This data management policy pertains to the curation of and access to experimental raw data and metadata collected and / or stored at the ISIS facility.
1.2 Acceptance of this policy is a condition of the award of beamtime at ISIS.
1.3 Users must not attempt to access, exploit or distribute raw data or metadata unless they are entitled to do so under the terms of this policy.
1.4 Deliberate infringements of the policy may lead to denial of access to ISIS raw data or metadata.
The Institution that owns the Dataset.
A link to the dataset or instructions on how to obtain a copy of the dataset for testing/dev purposes if this is possible.
The contact name for the Dataset. Type "[" and then your name to use autocomplete.This creates a link to your user profile on the wiki, including your contact details, so is the best way to add your name.
A bulleted list of possible preservation or business driven Issues or challenges. This is useful for describing ideas that might be turned into detailed Issues at a later date. Use concise bullets only. More detail can be added in Issue pages that are linked from this page.
List of Issues
A list of links to detailed Issue pages relevant to this Dataset. When you've added an Issue page, return to this page and add a link to it.