Attached to a core facility to take advantage of the byproduct of the core while it is being operated for other purposes.


Organizations that provide support for research conducted at a user facility, usually for the experimental units. Partners may be federal agencies, state governments, universities, for-profit corporations, or nonprofit organizations.


A type of neutron source that creates continuous neutron beams through controlled chain reactions involving nuclear fission of certain radioactive elements.


A type of neutron source in which a particle accelerator directs packets of high-energy protons at heavy metal targets, producing a burst of neutrons that can be used for condensed phase matter research.


Interested participants in the facilities enterprise. These include individual users; facility-based user groups, organizations, and review committees; and more broadly based user groups, organizations, and committees.


The government body responsible for supporting the core of a user facility, generally a federal department or agency with a mission interest in the research conducted and that has the knowledge and experience necessary for construction and operation of the facility.


A system of funding, managing, and operating national, multiuser facilities whereby the core facility is entirely supported by one agency: the steward.


A subset of a user facility, usually supported by an agency other than the steward, designed to conduct research of a specific type, designated either by field or by type of instrumentation used. Examples are the Center for High Resolution Scattering, supported by NSF at NIST CNR, and MacCHESS, supported by NIH at CHESS, devoted to studies of macromolecular structures.


A device creating radiation by accelerating relativistic charged particles and deflecting them with a magnetic field.

User facility

Any site or laboratory equipped to provide the synchrotron radiation, neutron beam, or high magnetic fields required to conduct research into the properties of matter that allows guest researchers to perform experiments to further their own research goals.

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