Twice a year, the CLS opens a Call for Proposals during which time proposals are accepted for peer-reviewed access to beamtime in the upcoming cycle. Each cycle is typically 6 months long. Successful proposals become active projects at the CLS and remain active for 2 years. During an open Call for Proposals, beamtime requests (BTRs) for active projects can also be submitted for consideration in the upcoming cycle.

| Cycle | Scheduling Period | Call Open | Call Close | PRC Meeting

(Week of) | Results Announced

(Week of) |
| --- | --- | --- | --- | --- | --- |
| 42 | July-Dec 2026 | Jan 28, 2026 | Feb 25, 2026 | Apr 20, 2026 | May 4, 2026 |