The U.S. Department of Energy (DOE) scientific user facilities – the High Flux Isotope Reactor (HFIR) and the Spallation Neutron Source (SNS) – are US Department of Energy sponsored research facilities open to researchers for advancing research in science and technology. HFIR and SNS, two of the world’s most advanced neutron scattering research facilities, offer thirty instruments covering a wide range of science and capabilities. Beam time is granted through the User Program and is free of charge with the condition researchers publish their results, making them available to the scientific community.

For Industries interested in learning more about proprietary research or how neutrons can help solve problems in industry, visit the Industrial Applications Program webpage.

General User Proposal Calls

Proposal calls are typically held bi-annually in the spring and fall.  The 2024-A General User Proposal Call will close for submissions on Wednesday, August 30, 2023. Only HFIR instruments will be available for request. Due to the planned Proton Power Upgrade (PPU) outage starting in August 2023, SNS instruments will not be accepting proposals in the 2023-B or 2024-A proposal calls.

Award letters for 2023-B submissions were sent April 26, 2023. 

SNS and HFIR are currently allowing onsite user access. Guidance regarding onsite visits can be found on the Plan Your Visit webpage.

Contact the User Office

The User Office is responsible for many aspects of the User Program. From submitting a proposal to coordinating your site access and training, the User Office staff are available to assist and answer your questions.


Phone: 865-574-4600