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.
Polarised photon emission in laser-plasma interactions Hard photon emission can be described using the Locally-constant Crossed Field Approximation (LCF A) [60, 14]
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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.