Call for Proposals

The CLS Call for Proposals for Cycle 35, which runs from January 1 – June 30, 2022, is now open.  The deadline for submissions is Wednesday, August 18 at 12pm (noon) CST

General User beamtime is via competitive peer review, twice per year, emphasizing the excellence of science where there is intent to publish scientific results. During the Call for Proposals, users can submit a new proposal or a beamtime request (BTR) against an active project. More information on submitting a proposal can be found here.


Want some advice on how to write your proposal? In this video, Kathryn Janzen, CLS User Experience Coordinator and Beamline Staff Scientist, will guide you through our beamtime access mechanisms, the peer review process, and the steps to writing a successful proposal.

If you would like more information, feel free to email our User Services Office at You can also contact us with science queries at


  • Cycle

    Call Open

    Call Close

    PEER REVIEW Deadline

    Peer Review Meeting (week of)

    Results Announced (week of)

    Scheduling Period Begins

    Scheduling Period Ends

  • 35

    Jul 21/21

    Aug 18/21

    Oct 4/21

    Oct 18/21

    Nov 1/21

    Jan 1/22

    Jun 30/22

  • 34

    Jan 27/21

    Feb 24/21

    Apr 2/21

    Apr 19/21

    May 3/21

    Jul 1/21

    Dec 31/21

  • 33

    Jul 29/20

    Aug 26/20

    Oct 2/20

    Oct 19/20

    Nov 2/20

    Jan 1/21

    Jun 30/21

  • 32

    Jan 29/20

    Feb 26/20

    Apr 13/20

    Apr 20/20

    May 11/20

    Jul 1/20

    Dec 31/20

  • 31

    Jul 31/19

    Aug 28/19

    Oct 18/19

    Oct 28/19

    Nov 4/19

    Jan 1/20

    Jun 30/20

  • 30

    Jan 30/19

    Feb 27/19

    Apr 12/19

    Apr 22/19

    May 13/19

    Jul 1/19

    Dec 31/19



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