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A typical laser-plasma accelerator (LPA) is driven by single, relativistic laser pulse from terawatt or petawatt-class Ti: sapphire lasers operating at 0.8 µm wavelength. There are recent studies on the use of two synchronized ultrashort relativistic co-propagating dual-color laser pulses for LPA research. In this presentation, I will present experimental results from a LPA driven by relativistically-intense dual-color laser pulses at the fundamental and second-harmonic (0.4 µm & 0.8 µm), where we observed a significant electron energy boost as compared with the case of a standard LPA driven by single 800 nm laser pulse of equivalent power [1,2], Fig.1. The results have been confirmed in an application experiment, where electron beam from the dual-color LWFA is used in a bremsstrahlung-based positron generation setup which led to an additional positron beam energy boost. On another front, recently laser technology offers a new generation of compact kHz (10s-100 mJ) few-cycle laser systems some of which are currently operational at ELI ALPS [3]. Using these laser systems, we are developing a beamline of kHz electron/positron/X-ray accelerator for applications in science and technology. In this lecture, I shall present the progress as well as the other activities of the Particle Acceleration Group at ELI ALPS.
References
[1] Song Li et al., Science Advances 5, eaav7940 (2019)
[2] Nasr A. M. Hafz et al., Plasma Physics and Controlled Fusion 62, 095012 (2020)
[3] S. Toth et al., J. Phys. Photonics 2, 045003 (2020)