ISIS Neutron and Muon Source

ISIS Neutron and Muon Source is a world-leading center for research in the physical and life sciences, operating at the Rutherford Appleton Laboratory in the United Kingdom. It produces intense beams of neutrons and muons, which scientists use to study the structure and dynamics of materials at the atomic level. The facility supports a global user community across disciplines including condensed matter physics, chemistry, materials science, and biology.

Overview

The facility is a major national asset operated by the Science and Technology Facilities Council and is situated on the Harwell Science and Innovation Campus in Oxfordshire. Its core function is to generate spallation neutrons and surface muons by accelerating protons to high energies and colliding them with a heavy metal target. This process enables a suite of advanced analytical techniques, such as neutron diffraction and muon spin spectroscopy, which are complementary to those available at synchrotron light sources like the Diamond Light Source, also located at Harwell. The international user program attracts researchers from institutions like the University of Oxford, University of Cambridge, and many global partners.

History and Development

The genesis of the facility dates to the late 1970s, with formal approval for construction granted by the UK government in 1980. It was built at the Rutherford Appleton Laboratory, a site with a long history in particle physics and nuclear research. The first neutron beams were delivered in 1984, and the facility was officially opened by Margaret Thatcher in 1985. A major expansion, known as the ISIS Second Target Station, was approved in the early 2000s and began operation in 2008, significantly enhancing capabilities for studying soft matter and biological systems. This development was part of a broader national strategy for large-scale research infrastructure, supported by bodies like the Engineering and Physical Sciences Research Council.

Scientific Instruments and Facilities

The heart of the facility is its linear accelerator and synchrotron, which accelerate protons to 800 MeV before they strike one of two target stations. The original ISIS First Target Station hosts instruments optimized for high-intensity experiments, while the ISIS Second Target Station provides instruments for lower-energy, long-wavelength neutrons. The suite of over thirty instruments includes famous beamlines like IRIS for spectroscopy, SANDALS for studying disordered materials, and EMU for muon research. The facility also features sample preparation laboratories, high-performance computing resources, and collaborative spaces for visiting scientists from institutions such as the European Spallation Source and the Institut Laue–Langevin.

Research and Applications

Research conducted spans fundamental science and applied technology. In materials science, studies have advanced the understanding of high-temperature superconductivity, hydrogen storage materials, and battery components. In the life sciences, techniques like neutron reflectometry are used to probe the structure of membranes and protein complexes. Industrial research partners, including Rolls-Royce and Johnson Matthey, utilize the facility for non-destructive testing of engineering components and developing new catalysts. The work has contributed to major projects like the ITER fusion reactor and the development of new pharmaceuticals.

Operation and Management

The facility is managed by the Science and Technology Facilities Council as part of the United Kingdom Research and Innovation ecosystem. It operates a peer-reviewed proposal system, where beam time is allocated based on scientific merit by committees including international experts. The director, Roger Eccleston, oversees a staff of scientists, engineers, and technicians who maintain the accelerator complex and support instruments. Operations are conducted in cycles, with periods dedicated to user experiments, maintenance, and development. The facility maintains strong collaborative ties with other major international centers, including the Spallation Neutron Source in the United States and the J-PARC in Japan.

Category:Research institutes in the United Kingdom Category:Neutron facilities Category:Buildings and structures in Oxfordshire Category:1984 establishments in England