SSRL Experimental Run Schedule

An electrical incident occurred at SLAC on December 27 during downtime maintenance activities involving high voltage equipment independent of SSRL/SPEAR. New controls of hazardous energy (CoHE) protocols, lock-out-tag-out (LOTO) restrictions and additional work authorizations have affected our ability to restart accelerators and other instrumentation that require control of hazardous energy.

On January 11, SSRL exterior transformer A5K experienced an electrical fault, followed by an overheat condition on January 13. This is a large dry transformer in an exterior cabinet just west of Building 140/141 (SSRL SPEAR Booster Ring and Booster Power Supply). The transformer experienced a destructive overheat condition that burned up its winding insulation. This transformer is needed for SSRL SPEAR and beam lines to operate. All SSRL user experiments scheduled through at least late May/early June have had to be canceled. This estimate will be impacted by the extent of damage to the transformer and other equipment that suddenly lost power when the transformer fire occurred. In an effort to make up for lost user beam time this winter and spring, the one-week June downtime previously on our run schedule has been cancelled, and we plan to continue user operations until Aug. 14. We will provide updates as we learn more.


The FY2022-23 SPEAR Schedule will be updated shortly.  To view and accept X-ray/VUV user beam time previously scheduled at SSRL through the end of April, log into the user portal. Click below for the user schedule by Beam Line Type (X-ray / VUV / Macromolecular Crystallography) and Beam Line (BL #).

Schedules are subject to change; contact the User Office or beam line staff for details.


(BL1-5, 2,1, 2-2, 2-3, 4-1, 4-2, 4-3, 6-2a/6-2b/6-2c*, 7-2, 7-3, 9-3, 10-2a/10-2b*, 14-3a/14-3b*, 15-2, 17-2)


(BL5-2/4*, 8-2, 10-1, 13-2/3*, 16-2)  

*Indicates beam lines with shared beam time between end stations which cannot run simultaneously.

Macromolecular Crystallography
BL9-2, 12-1, 12-2, 14-1)
see: Support Staff Schedule

FY2022-23 SPEAR Schedule


see Schedule Archive

In addition to the User OfficeSafety Office, and Beam Line contacts, the SSRL Duty Operator will be available 24/7 if you have questions or need any assistance during your visit.

Contact beam line staff to discuss SSRL capabilities and proposed research experiments. Contact the User Office if you have questions about COVID-19 impacts on your experiments.

To access SSRL beam lineslog into the user portal to submit new proposals or beam time requests (BTRs) by the posted deadlines. Review/accept beam time assignments and submit beam time support requests through the user portal.

SSRL Beam Line Schedule InformationMany factors are considered in scheduling SSRL beam time including availability of resources (equipment, beam line staff, etc.). Experiments with similar equipment configuration are scheduled together whenever feasible for maximum efficiency and to minimize downtime. Scheduling priority is given to highly rated proposals, while also considering the amount of beam time that has previously been allocated as well as the proposal team's demonstrated productivity (publications). A rating of ~1.4 is generally the initial cut off for beam time on most oversubscribed SSRL beam lines. Additional requests are kept in the queue and may be accommodated to fill cancelled beam time.

Note:   Many SSRL beam lines are significantly oversubscribed with highly rated proposals. Research teams with multiple proposals will be limited in the amount of beam time assigned. Requests for the most oversubscribed beam lines may be limited to 1 or 2 experiments per research group per run year, depending on the specific beam line availability.

Prepare to Visit SLAC & SSRLContact the designated SSRL beam line engineer/scientist a few weeks prior to arrival to discuss beam line configuration needs and to confirm your estimated start time. Most beam lines officially turn over to the next user BEFORE 3 pm, but usually it is much earlier in the day depending on equipment requirements and staff availability. Plan to arrive early in the morning (~ 8 am) to assist beam line staff who may have questions about your set up and to complete training if applicable.

Before traveling to SLAC, all users must be registered on the SSRL/LCLS user portal, be listed on a scheduled proposal, and complete training (review access procedures).

BRING ORIGINAL IDENTIFICATION DOCUMENTS to the SLAC SUSB VUE Center and Security Badging Office to obtain an ID badge or renew SLAC access. This is required at the start of each run year (October-September).

Accelerator Schedule (for staff)

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