Manuel Lujan Jr. Neutron Scattering Center

Manuel Lujan Jr. Neutron Scattering Center. It is a major national user facility for neutron scattering research located at Los Alamos National Laboratory in New Mexico. The center operates a powerful pulsed neutron source driven by a linear accelerator, providing beams for a wide array of scientific investigations. Its instruments are used by researchers from academia, industry, and government laboratories to study the structure and dynamics of materials.

Overview

The facility is a premier destination for condensed matter physics, materials science, chemistry, and geology research using neutron-based techniques. As a national user facility funded by the United States Department of Energy, its primary mission is to provide open access to state-of-the-art neutron scattering capabilities for the broader scientific community. The center's unique pulsed spallation neutron source, known as the Los Alamos Neutron Science Center (LANSCE) target, produces neutrons by bombarding a heavy metal target with a high-energy proton beam from a linear accelerator. This design differs from continuous nuclear reactor-based sources like the High Flux Isotope Reactor at Oak Ridge National Laboratory or the Institut Laue–Langevin in France.

Scientific Instruments

The center hosts a suite of specialized instruments positioned around its neutron source. Key instruments include the NPDF diffractometer for probing atomic pair distribution functions, the HIPD high-intensity powder diffractometer, and the HIPPO diffractometer for texture and strain analysis. For inelastic scattering, the PHAROS spectrometer studies phonon and magnetic excitations, while the ASTERIX spectrometer is used for vibrational spectroscopy. Other notable instruments are the LQD low-Q diffractometer for large-scale structures and the SPEAR spectrometer for reflectometry studies of thin films and interfaces. Each instrument is optimized to exploit the time-of-flight method inherent to a pulsed source.

Research and Applications

Research conducted spans fundamental science to applied engineering. Scientists use the facility to investigate high-temperature superconductors, hydrogen storage materials, batteries, and complex magnetic materials. Studies in geophysics examine the behavior of minerals under extreme conditions relevant to planetary interiors. The center also supports research in soft matter, including polymers and biological macromolecules, and plays a role in national security-related work, such as the examination of nuclear materials and advanced alloys. The non-destructive, penetrating nature of neutrons makes them ideal for probing bulk properties, light elements like hydrogen, and magnetic moments.

History and Naming

The center's origins are tied to the construction of the Los Alamos Meson Physics Facility (LAMPF) in the 1970s, which included a linear accelerator capable of producing neutrons. The dedicated neutron scattering facility was formally established in 1985. In 1991, it was renamed in honor of Manuel Lujan Jr., a Congressman from New Mexico who served for two decades and was a strong advocate for science and the laboratory. Lujan later served as the United States Secretary of the Interior under President George H. W. Bush. The facility has undergone several upgrades, including enhancements to its target station and instrument suite, to maintain its competitiveness alongside international facilities like the Spallation Neutron Source at Oak Ridge and the J-PARC in Japan.

User Program and Access

Access to the instruments is granted through a peer-reviewed proposal system. Researchers from around the world submit proposals to the center's User Office, which are evaluated by a scientific review committee based on scientific merit and technical feasibility. Successful proposers are awarded beam time at no cost for non-proprietary research. The center also supports a vigorous educational mission, hosting postdoctoral researchers, graduate students, and undergraduate interns. Training workshops and schools, often in collaboration with organizations like the Neutron Scattering Society of America, are regularly held to train the next generation of neutron scientists.

Category:Research institutes in New Mexico Category:Neutron facilities Category:Los Alamos National Laboratory