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Abstract: High-peak-power attosecond X-ray free-electron laser (FEL) pulses carrying orbital angular momentum (OAM) have recently been proposed based on a self-seeded FEL configuration with OAM. In the first stage, an isolated attosecond seed pulse is generated. An OAM-converting optical element is then inserted during the subsequent amplification in the linear regime, well before saturation, in order to mitigate thermal loading while imprinting the required azimuthal phase. The resulting attosecond OAM seed is further amplified in a second stage to reach high peak power. In this work we propose replacing the spiral-phase plate with a phase mask, which relaxes the requirements on the optical element and simplifies the experimental setup for high-power attosecond OAM generation.
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