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- W3104261585 abstract "Strong-field quantum electrodynamics predicts electron-seeded electron-positron pair cascades when the electric field in the rest-frame of the seed electron approaches the Sauter-Schwinger field, i.e. $eta = E_{RF}/E_S sim 1$. Electrons in the focus of next generation multi-PW lasers are expected to reach this threshold. We identify three distinct cascading regimes in the interaction of counter-propagating, circularly-polarised laser pulses with a thin foil by performing a comprehensive scan over the laser intensity (from $10^{23}$ -- $5times10^{24}$ Wcm$^{-2}$) and initial foil target density (from $10^{26}$ -- $10^{31}$ m$^{-3}$). For low densities and intensities the number of pairs grows exponentially. If the intensity and target density are high enough the number density of created pairs reaches the relativistically-corrected critical density, the pair plasma efficiently absorbs the laser energy (through radiation reaction) and the cascade saturates. If the initial density is too high, such that the initial target is overdense, the cascade is suppressed by the skin effect. We derive a semi-analytical model which predicts that dense pair plasmas are endemic features of these interactions for intensities above $10^{24}$ Wcm$^{-2}$ provided the target's relativistic skin-depth is longer than the laser wavelength. Further, it shows that pair production is maximised in near-critical-density targets, providing a guide for near-term experiments." @default.
- W3104261585 created "2020-11-23" @default.
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- W3104261585 date "2019-01-31" @default.
- W3104261585 modified "2023-10-03" @default.
- W3104261585 title "Identifying the electron–positron cascade regimes in high-intensity laser-matter interactions" @default.
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- W3104261585 doi "https://doi.org/10.1088/1367-2630/aafa39" @default.
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