Abstract
Abstract Laser–plasma accelerators (LPAs) have great potential to realize a compact X-ray free-electron laser (FEL), which is limited by the beam properties currently. Two-color high-intensity X-ray FEL provides a powerful tool for probing ultrafast dynamic systems. In this paper, we present a simple and feasible method to generate a two-color X-ray FEL pulse based on an LPA beam. In this scheme, time-dependent mismatch along the bunch is generated and manipulated by the designed lattice system, enabling FEL lasing at different wavelength within two undulator sections. The time separation between the two pulses can be precisely adjusted by varying the time-delay chicane. Numerical simulations show that two-color soft X-ray FELs with gigawatt-level peak power and femtosecond duration can be generated, which confirm the validity and feasibility of the scheme.
Highlights
X-ray free-electron lasers (FELs) [1, 2, 3] characterized by high brightness, spatial coherence, and ultrashort pulse represent a revolution in light source development, opening up new frontiers of ultrafast and ultrasmall science in atomic physics, femtochemistry, and biology, etc [4,5,6]
Compact FELs driven by laser plasma accelerators (LPAs) have considerable potential to become a table-top light source with smaller scale [11,12,13,14]
We propose a novel and simple scheme for the generation of the LPA based two-color x-ray FEL pulses
Summary
X-ray free-electron lasers (FELs) [1, 2, 3] characterized by high brightness, spatial coherence, and ultrashort pulse represent a revolution in light source development, opening up new frontiers of ultrafast and ultrasmall science in atomic physics, femtochemistry, and biology, etc [4,5,6]. Comparing to the normal scheme combining a conventional laser pump with an x-ray FEL probe, the most advantages are insignificant timing jitter and tunable wavelengths. These methods provide a helpful way to realize the LPA based two-color FEL. The LPA is taken into consideration for regular FEL mode generation, and expected to provide more output characteristics, i.e. two-color pulses In this manuscript, we propose a novel and simple scheme for the generation of the LPA based two-color x-ray FEL pulses. Accepted manuscript initial divergence and energy spread of the LPA beam that generates time-dependent mismatch with the help of quadrupoles and chicane.
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