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  The SLAC Matter in Extreme Conditions Experimental Hall Cavern

  The SLAC National Accelerator Laboratory (SLAC) is operated by Stanford University as a contractor for the United States Department of Energy (DOE). SLAC supports a large national and international community of scientific users performing cutting edge research in support of the DOE mission. The Matter in Extreme Conditions Upgrade Facility Project (MEC-U) will reconfigure and upgrade the MEC instrument at the Linac Coherent Light Source (LCLS) and co-locate high peak power and high energy lasers with the existing LCLS beam lines. The MEC-U conventional facilities will provide the MEC Experimental Hall (XEH), a support building, and the mechanical and electrical systems for the new laser systems and target chambers. The MEC-U is being designed in a collaborative effort between the scientific team, design consultants and a future design-build team. The XEH cavern will be built in a new 68.6m long cavern with a finished clear internal span of over 18m at invert level. The XEH cavern will be excavated with low ground cover using sequential excavation methods (SEM) within the weak, partially cemented, decomposed Ladera sandstone. A reinforced shotcrete lining will provide initial and final support. The XEH cavern will be procured using a conventional design-build approach.

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