J.L. Martins, J. Vieira, J. Ferri and T. Fülöp
Recent experiments on the production of lasers with Laguerre-Gaussian modes and their interaction with matter have produced high-intensity laser beams with non-zero angular momentum (e.g. ). These developments pave the way for exploring laser-wakefield accelerators with structured laser drivers, which provide the access to new acceleration regimes. Recent theory and simulations, for example, have shown that structured lasers can control the topology of the plasma wave towards the generation of vortex electron bunches with orbital angular momentum . Despite these advances, the radiation emission from structured laser-plasma accelerators remains largely unexplored.
In this work, we study X-ray radiation generation from electron bunches accelerated in laser-wakefields driven by lasers with orbital angular momentum. In particular, we explore the use of multiple lasers with Laguerre-Gaussian modes to drive multiple rotating wakefields . The radius and angular rotation velocity provide new knobs to control key features of the radiation such as its spectral intensity.
Through detailed three-dimensional simulations we explore the transverse dynamics of electrons in the rotating bubbles and the radiation produced by them. We show that this setup allows for greater tunability of the oscillation amplitude of the injected electrons, which is not limited to the radius of the bubble as in typical laser-wakefield accelerators . The detailed properties of the radiation, including its divergence and spectrum are explored in different scenarios with both rotating and non-rotating composite lasers .
 Leblanc, A. et al. Nat. Phys. 13, 440 (2017).
 J. Vieira et al., Phys. Rev. Lett. 121, 054801 (2018).
 J.L. Martins et al., arXiv:1810.06929 [physics.plasm-ph] (2018)
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