The experimental safety sheet (ESS) is the primary safety document that authorizes user work at the ALS.  It documents the samples and any additional equipment the user is bringing to the ALS.  It must be signed by all the experimenters, the ALS safety coordinator, and the beamline scientist before work can begin.  A completed and authorized ESS for each experiment going on at every endstation must be posted on the sector 1 experiment board (in the hallway on the perifery of the experimental floor).  Experiments found to be running without a posted ESS or experimenters working without being listed on the ESS will be halted.

Data for the ESS is generally collected when the beamtime proposal is completed, but if you have changes, especially if more hazardous or new biological materials are added, please inform us as soon as possible before your scheduled beamtime.

For more information and links to the on-line ESS form, see the ALS Experiment Safety Sheet description webpage.