LCLS Run 26 Call for Proposals & Virtual Town Hall Meeting

LCLS Call for Proposals for period: March 2026 – July 2026 (Run 26)

Submission Deadline: 06 August 2025 (4:00 PM Pacific Time)

We are pleased to announce the call for LCLS Proposals for Run 26. This Run will offer capabilities on the soft and hard X-ray instruments using the LCLS normal conducting (NC) accelerator at 120 Hz while the superconducting accelerator is undergoing a major upgrade to higher energies under the LCLS-II-HE project. While undergoing this upgrade, both the soft and hard X-ray undulators will be operated up to 120 Hz. Three soft X-ray instruments will be available for user proposals (TMO, chemRIXS and qRIXS). For the hard X-ray instruments, vertically polarized 5 to 25 keV X-rays in the fundamental will be available, as well as rapid tuning / scanning capability using the variable gap system for both undulators. The hard X-ray undulator will provide beam to the suite of hard X-ray instruments (XPP, XCS, MFX, CXI & MEC). In Run 26, the XPP instrument will return to operations after an upgrade to be ready for the upcoming LCLS-II-HE capabilities. XPP will be able to operate with the copper beam at 120 Hz during this Run.

Full details of the Run 26 proposal call: https://lcls.slac.stanford.edu/proposals/run26

Virtual Town Hall Meeting

A Virtual LCLS “Town Hall” User Meeting to discuss Run 26 will be held at 9:00 am Pacific Daylight Time on July 16, 2025.