All Beamlines (Except MX)

Proposal Submission

General User beamtime is via competitive peer review, twice per year, emphasizing the excellence of science where there is intent to publish scientific results. See Call for Proposal Deadlines for important dates regarding the Call for Proposals.

During the Call for Proposals, users can submit a new proposal or a beamtime request (BTR) against an active project.

Proposal Review

All new proposals submitted through the Call for Proposals are subject to technical, safety, ethics (if applicable), and peer review. Click here for details about the Peer Review evaluation process.

Beamtime Allocation

The Allocation Committee allocates beamtime on all beamlines (except MX) and for all categories. See Beamtime Allocation for General User beamtime allocation.

Proposals awarded beamtime require an appropriate address for invoicing purposes. Invoices are generated on a regular basis for an access fee of $1 per eight hour shift and fees for other items such as materials, supplies, and shipping/receiving of samples/products.

Scheduling Beamtime

CLS schedules research on all beamlines. Each scheduling cycle will identify the number of eight-hour shifts to be allocated to each experiment or group. The beamline staff schedule beamtime on each experimental facility using input from the Allocation Committee, Beamteam, and users to optimize the final schedule. Confirmation of scheduling is provided via the User Portal (see Creating and Managing your Proposal).

Given the complex nature of synchrotron facilities, when user beamtime is lost due to unforeseen circumstances, it will not automatically be rescheduled. CLS is committed to working with affected users to maintain the continuity of their experimental programs. On a user-by-user basis, discretionary time may be allocated when possible.


CLS promotes and encourages open communication between all users of the beamlines at CLS. Appeals relating to proposal ratings and/or allocation will follow the process identified in the appeals guidelines.

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If you’re looking for information on how you can use CLS techniques in your research program, please contact us using this form.

Example queries may include: Feasibility around a potential experiment? A scientific problem we can help you solve? Is your question related to a specific technique? Do you want to know more about how to apply for beamtime?