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An experimental study of laser driven electron acceleration in N2 and N2-Hemixed gas-jet target using laser pulses of duration ~60-70 fs is presented.Generation of relativistic electron beam with quasi-thermal spectra wasobserved at a threshold density of ~1.6x1018 cm-3 in case of pure N2, and thethreshold density was found to increase with increasing doping concentration ofHe. At an optimum fraction of 50% of He in N2, generation ofquasi-monoenergetic electron beams was observed at a comparatively higherthreshold density of ~2x1018 cm-3, with an average peak energy of ~168 MeV,average energy spread of ~21%, and average total beam charge of ~220 pC.Electron acceleration could be attributed to the direct laser acceleration aswell as the hybrid mechanism. Observation of an optimum fraction of He in N2(in turn threshold plasma density) for comparatively better quality electronbeam generation could be understood in terms of the plasma density dependentvariation in the dephasing rate of electrons with respect to transverseoscillating laser field. Results are also supported by the 2D PIC simulationsperformed using code EPOCH.

Direct laser acceleration of electrons in high-Z gas target and effect of threshold plasma density on electron beam generation