Observations of high‐energy electron distributions in laser plasmas

A very energetic (20–60 keV) electron distribution is observed in laser plasmas produced with both 1054 and 351 nm drivers. This component, believed to be generated by the 2ωp instability, is present at intensities above approximately 2×1014 W/cm2 and contains less than 0.1% of the incident energy. For 1054 nm irradiation, this component appears in addition to the 2 to 7 keV distribution attributed to resonance absorption.

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