研究目的
To propose an alternative scheme to generate X-ray pulses from FEL based on high-harmonic-generation (HHG) from infrared FEL pulses at MHz repetition, exploring attosecond X-ray pulse generation.
研究成果
The proposed FEL-HHG scheme offers a promising method for generating attosecond X-ray pulses at MHz repetition rates, with ongoing R&D to integrate technologies and demonstrate the generation from CEP-stable mid-infrared FEL pulses.
研究不足
The main limitation is the wavelength limitation of solid-state few-cycles lasers for HHG experiments utilizing mid-infrared pulses beyond 4 μm.
1：Experimental Design and Method Selection:
The scheme involves generating X-ray pulses via HHG from infrared laser pulses focused at a gas target, with an external seed laser injected to stabilize carrier-envelope phase (CEP) of the FEL pulses.
2：Sample Selection and Data Sources:
Utilizes existing FEL facilities for few-cycle FEL pulse generation at mid-infrared wavelengths and stacking of FEL pulses in an external cavity.
3：List of Experimental Equipment and Materials:
Includes FEL oscillators, photocathode DC electron guns, superconducting RF linacs, and mode-locked laser oscillators.
4：Experimental Procedures and Operational Workflow:
Involves dynamic desynchronization of the FEL resonator for high-extraction efficiency, and assembling an external cavity for FEL pulse stacking.
5：Data Analysis Methods:
Simulation studies to evaluate pulse stacking performance and optimize cavity parameters.
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