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ISIS Neutron and Muon Source
The ISIS Neutron and Muon Source is a pulsed neutron and muon source, established 1984 at the Rutherford Appleton Laboratory of the Science and Technology Facilities Council, on the Harwell Science and Innovation Campus in Oxfordshire, United Kingdom. It uses the techniques of muon spectroscopy and neutron scattering to probe the structure and dynamics of condensed matter on a microscopic scale ranging from the subatomic to the macromolecular.
Hundreds of experiments are performed every year at the facility by researchers from around the world, in diverse science areas such as physics, chemistry, materials engineering, earth sciences, biology, and archaeology.
Neutrons are uncharged constituents of atoms and penetrate materials well, deflecting only from the nuclei of atoms. The statistical accumulation of deflected neutrons at different positions beyond the sample can be used to find the structure of a material, and the loss or gain of energy by neutrons can reveal the dynamic behaviour of parts of a sample, for example diffusive processes in solids. At ISIS, the neutrons are created by accelerating "bunches" of protons in a synchrotron, then colliding these with a tungsten target, under a constant cooling load to dissipate the heat from a 160 kW proton beam. The impacts cause neutrons to spall off the tungsten atoms, and the neutrons are channelled through guides, or beamlines, to around 20 instruments, each individually optimised for the study of different types of interactions between the neutron beam and matter. The target station and most of the instruments are set in a large hall. Neutrons are a dangerous form of radiation, so the target and beamlines are heavily shielded with concrete.[citation needed]
ISIS Neutron and Muon Source produces muons by colliding a fraction of the proton beam with a graphite target, producing pions which decay rapidly into muons, delivered in a spin-polarised beam to sample stations.[citation needed]
The source was approved in 1977 for the RAL site on the Harwell campus and recycled components from earlier UK science programmes, including the accelerator hall which had previously been occupied by the Nimrod accelerator. The first beam was produced in 1984, and the facility was formally opened by the then Prime Minister Margaret Thatcher in October 1985.
The name ISIS is not an acronym: it refers to the Ancient Egyptian goddess and the local name for the River Thames. The name was selected for the official opening of the facility in 1985; prior to this it was known as the SNS, or Spallation Neutron Source. The name was considered appropriate as Isis was a goddess who could restore life to the dead, and ISIS made use of equipment previously constructed for the Nimrod and NINA accelerators.
The second target station was given funding in 2003 by Lord Sainsbury, then science minister, and was completed in 2009, on time and budget, with the opening of 7 instruments. In March 2011, the Science Minister, David Willetts, gave a £21 million investment to build 4 new instruments, which are now[when?] all in their commissioning phase or fully scheduled instruments.
ISIS Neutron and Muon Source was originally expected to have an operational life of 20 years (1985 to 2005), but its continued success led to a process of refurbishment and further investment, intended to advance the facility and extend the life of ISIS through to 2030.
Hub AI
ISIS Neutron and Muon Source AI simulator
(@ISIS Neutron and Muon Source_simulator)
ISIS Neutron and Muon Source
The ISIS Neutron and Muon Source is a pulsed neutron and muon source, established 1984 at the Rutherford Appleton Laboratory of the Science and Technology Facilities Council, on the Harwell Science and Innovation Campus in Oxfordshire, United Kingdom. It uses the techniques of muon spectroscopy and neutron scattering to probe the structure and dynamics of condensed matter on a microscopic scale ranging from the subatomic to the macromolecular.
Hundreds of experiments are performed every year at the facility by researchers from around the world, in diverse science areas such as physics, chemistry, materials engineering, earth sciences, biology, and archaeology.
Neutrons are uncharged constituents of atoms and penetrate materials well, deflecting only from the nuclei of atoms. The statistical accumulation of deflected neutrons at different positions beyond the sample can be used to find the structure of a material, and the loss or gain of energy by neutrons can reveal the dynamic behaviour of parts of a sample, for example diffusive processes in solids. At ISIS, the neutrons are created by accelerating "bunches" of protons in a synchrotron, then colliding these with a tungsten target, under a constant cooling load to dissipate the heat from a 160 kW proton beam. The impacts cause neutrons to spall off the tungsten atoms, and the neutrons are channelled through guides, or beamlines, to around 20 instruments, each individually optimised for the study of different types of interactions between the neutron beam and matter. The target station and most of the instruments are set in a large hall. Neutrons are a dangerous form of radiation, so the target and beamlines are heavily shielded with concrete.[citation needed]
ISIS Neutron and Muon Source produces muons by colliding a fraction of the proton beam with a graphite target, producing pions which decay rapidly into muons, delivered in a spin-polarised beam to sample stations.[citation needed]
The source was approved in 1977 for the RAL site on the Harwell campus and recycled components from earlier UK science programmes, including the accelerator hall which had previously been occupied by the Nimrod accelerator. The first beam was produced in 1984, and the facility was formally opened by the then Prime Minister Margaret Thatcher in October 1985.
The name ISIS is not an acronym: it refers to the Ancient Egyptian goddess and the local name for the River Thames. The name was selected for the official opening of the facility in 1985; prior to this it was known as the SNS, or Spallation Neutron Source. The name was considered appropriate as Isis was a goddess who could restore life to the dead, and ISIS made use of equipment previously constructed for the Nimrod and NINA accelerators.
The second target station was given funding in 2003 by Lord Sainsbury, then science minister, and was completed in 2009, on time and budget, with the opening of 7 instruments. In March 2011, the Science Minister, David Willetts, gave a £21 million investment to build 4 new instruments, which are now[when?] all in their commissioning phase or fully scheduled instruments.
ISIS Neutron and Muon Source was originally expected to have an operational life of 20 years (1985 to 2005), but its continued success led to a process of refurbishment and further investment, intended to advance the facility and extend the life of ISIS through to 2030.