Nonlinear Compton x-rays from a laser-solid plasma at 10^21 W/cm^2 are predicted to be more than 65% polarised above 10 keV, a signature that could distinguish the strong-field QED flash from bremsstrahlung.
These ‘QED-plasmas’ are found in extreme astrophysical environments, such as pulsar magnetospheres [6, 7], but have yet to be realised in the laboratory
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Bright polarised x-ray flashes from dense plasmas
Nonlinear Compton x-rays from a laser-solid plasma at 10^21 W/cm^2 are predicted to be more than 65% polarised above 10 keV, a signature that could distinguish the strong-field QED flash from bremsstrahlung.