We report the first demonstration of high-harmonic generation from plasma mirrors at a repetition rate. Harmonics up to nineteenth order are generated at peak intensities close to by focusing , laser pulses down to FWHM spot size without any prior wavefront correction onto a moving target. We minimize target surface motion with respect to the laser focus using online interferometry to ensure reproducible interaction conditions for every shot and record data at with unprecedented statistics. This allows us to unambiguously identify coherent wake emission as the main generation mechanism.
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