The laser-plasma interaction is approached within the frame of the project, with an aim to identify novel capillary discharge geometries suited for increasing the reproducibility, energy and quality of the laser accelerated electron beams. In order to achieve these goals, different methods and techniques will be investigated for pulsed filamentary plasma generation under preionization conditions. Inducing steep longitudinal density gradient for controlling the electron injection will be achieved both by generation of pulsed intense transverse magnetic fields and by novel discharge configurations with cross currents. These novel capillary discharge geometries proposed in this project will be assessed, in the quest to optimize the laser accelerated electron beams and the transport of electrons under polaritonic conditions, by favouring temporal and spatial synchronization of the electron package with an ultra-intense laser pulse [M. Apostol and M. Ganciu, Polaritonic pulse and coherent X- and gamma rays from Compton (Thomson) backscattering, Journal of Applied Physics, 109 (2011) 013307 - selected as Research Highlight]