The Advanced Photon Source
a U.S. Department of Energy Office of Science User Facility

Partner User Proposals

Partner user proposals (PUPs) contribute to the development of the facility in exchange for a set amount of beam time. The process provides access for projects that:

  • Require reliable beam time over multiple cycles, and
  • Will ultimately benefit the general user community (e.g., provide new instrumentation or capabilities that will be available to all users or by creating or expanding a user community).

Any beamline operated by the APS is open to partner user proposals. Details of the Partner User Program can be found in the Comprehensive APS Beam Time Access Policy (APS_1700813).

Log in to Proposal System


Submission deadlines:

New proposals and requests for beam time against existing proposals are accepted three times a year, in March, July, and October.

Review and allocation:

Proposals are peer reviewed, scored according to a set of review criteria, and reviewed further by a subcommittee of the APS Scientific Advisory Committee; the final decision on acceptance is made by the APS Deputy Director. Time is allocated by a committee in accordance with the terms of the PUP. 


The terms of the lifetime of the proposal are determined in the review process. 



To comment on the contents, please contact or 630-252-9090.