Proposal Calls

Submission Deadline for 2023-A General User Proposal Call

The Neutron Sciences General User Proposal Call 2023-A closed on September 21, 2022. Award letters for 2023-A submissions will be sent by November 18. Researchers should apply directly via the Integrated Proposal Tracking System (IPTS). For more information, contact the User Office.

See below for more information about instrument availability and sample environment limitations.

SNS Awards and Beamtime

Proposals awarded beam time at Spallation Neutron Source (SNS) will be scheduled to run from February to August 2023.

Due to the planned Proton Power Upgrade (PPU) outage starting in August 2023, SNS instruments will not be accepting proposals in the next (2023-B) proposal call. 

HFIR Awards and Beamtime

Available beamtime at the High Flux Isotope Reactor (HFIR) will be limited.

Proposals awarded beam time at HFIR will be scheduled to run from January to June 2023.

Instrument Limitations

The following instruments are accepting submissions with specific limitations:

  • BL-1A (USANS) cannot accept proposals requiring rheometer. All sample preparation must be done by the experiment team. USANS instrument staff are unable to prepare samples for users.
  • BL-1B (NOMAD) cannot accept proposals requiring gas flow. Remote experiments using either the furnace or cryostat are limited to one sample per day.
  • BL-4B (LIQREF) requires each experimental team to send a minimum of two team members in order to sufficiently cover their beamtime.
  • BL-5 (CNCS): For Closed Cycle Refrigerator experiments requesting more than one sample, proposals must be discussed with a beamline scientist before submission. For dilution refrigerator inserts, proposals must be discussed with a beamline scientist before submission and beamtime awards are subject to both helium and personnel resources.
  • BL-6 (EQ-SANS) encourages onsite experiments and will restrict use of remote experiments for this cycle.
  • BL-7 (VULCAN) requires at least two team members onsite for proposals using the VULCAN load frame.
  • BL-9 (CORELLI) cannot support high pressure experiments and requires presence of two team members for complex sample environments, such as dilution fridge, He3 and magnet.
  • BL-11A (POWGEN): Users are strongly encouraged to come onsite, especially for complicated sample environments, such as AGES and magnets. For remote experiments, manual sample changes are limited to up to two per day during normal working hours (9 a.m. to 6 p.m. Eastern).

Guidance for Onsite and Remote Experiments

The SNS and HFIR are currently allowing onsite access to users, with restrictions in effect as a continued response to COVID-19. Current guidance regarding access guidelines and limitations are found on the Plan Your Visit webpage as well as the Neutron Sciences User Playbook.

Remote instrument control capabilities are now available on most SNS and HFIR instruments and can be requested in proposal submission. You are highly encouraged to discuss your proposed research with an instrument scientist for feedback before submitting.