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No laboratory has yet reached the needed intensity or seen this growth.","posed_since":"2008","precise":"In counterpropagating or multi-beam (dipole-wave) laser fields an avalanche cascade, with pair number growing as $\\exp(\\Gamma t)$ over several laser periods, is predicted above an intensity of order $10^{31}\\ \\mathrm{erg}\\ \\mathrm{s}^{-1}\\ \\mathrm{cm}^{-2}$ for 1-micron light, about ten times the record peak intensity of about $10^{30}\\ \\mathrm{erg}\\ \\mathrm{s}^{-1}\\ \\mathrm{cm}^{-2}$ (2021, approximate). Determine the minimal laser energy and geometry (colliding pulses, dipole focusing, single-pulse reflection from a plasma mirror) at which the pair number grows by several e-foldings, and observe it through positron yield scaling that exceeds the one-generation shower prediction.","problem_ref":"3de8dad991414c538392d7daf5ca1ebf1c192ce235057d1d18d6c267127e4b5d","references":"","settled_by":"A positron-yield measurement versus intensity at a multi-10-PW facility showing exponential growth beyond seeded shower predictions.","status_note":"No laboratory avalanche cascade is known to this compilation as of 2026.","title":"First laboratory observation of a self-sustained avalanche QED 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