MEC-U Design and Performance X-ray specificationsPreliminary laser specificationsHigh rep-rate short pulse: 10 Hz, 150 J, 150 fs, 1 PWHigh rep-rate long pulse: 10 Hz, 200 J @ 2ω @ 10ns; programmable pulse shapeHigh energy long pulse: ~2 shots/hour, > 1 kJ @ 2ω @ 10ns; programmable pulse shapeTarget areasDiagnosticsFlagship experimentsConventional FacilitiesFurther details are available in the design report: MEC-U Conceptual Design Report (https://www.osti.gov/biblio/1866100 or https://doi.org/10.2172/1866100)