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Description
Generating and synchronizing two-color attosecond x-ray pulses is vital for ultrafast electronic studies. We propose a novel dual chirp-taper free-electron laser scheme exploiting bunching inheritance to generate attosecond pulse pairs. An electron beam with a laser-induced sinusoidal energy chirp traverses tapered main and afterburner undulators. This produces two-color pulses separated by femtoseconds and tens of eVs. Bunching inheritance enables a remarkably short afterburner, minimizing source-point distance and easing beamline focusing. Comprehensive analysis confirms excellent radiation stability against SASE shot noise and few-cycle laser CEP jitter. This robust approach advances attosecond pump-probe techniques and coherent control of quantum systems.
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