Operating Schedule
SSRL operates as a dedicated synchrotron radiation source for approximately nine months per year (usually late October through late July). Maintenance and upgrade activities are arranged during the down time (August-September). The SSRL run year, called a cycle, is divided into three scheduling periods, called runs.
Please note that the SSRL Operating Schedule for the 2026-2027 run has changed relative to that previously posted under FY26 below. The user startup is now scheduled for October 12, 2026.
The 2026-2027 run will end early, on June 14, 2027, to enable a longer summer 2027 shutdown for the facility infrastructure work in preparation for a new beam line (see the SPEAR3 Schedule for FY27). The 2027-2028 run is currently planned to start October 18, 2027.
Log into the User Portal to view and accept beam time assignments. Contact beam line staff to discuss SSRL capabilities and proposed research experiments. Contact the User Office via SSRL-user-office@SLAC.Stanford.edu if you have questions or need assistance.