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We demonstrate in this research the quasi-monoenergetic electron and protonacceleration through three dimensional particle-in-cell simulations of shortpetawatt circular polarized laser pulse interactions with near critical densityhydrogen target. We numerically show that under controlled choice of laser andtarget parameters, the high energy electrons and protons can be illustrated inexperiment at advanced high power laser facilities eg ELI - ALPS. We detailedthe microphysics involved in the acceleration mechanism, which requiredinvestigating the role of plasma density gradients, plasma density, and targetthickness. The role of selfgenerated plasma electric and magnetic fields isdepicted on proton energy and density distribution. We numerically investigatehere the laser driven proton acceleration where energetic protons with energiesmore than 200 MeV and charge in excess of 10 nC and conversion efficiency morethan 6 percent (which implies 2.4 J proton beam out of the 40 J incident laserenergy). Additionally and interestingly, we show from simulation study firsttime the quasi-monoenergetic ring shaped electron beam driven by circularlypolarised laser which may prove useful for plasma based-based X-ray source andcollimation of positron beam.

High Energy electron and proton acceleration by circularly polarized laser pulse from near critical density hydrogen gas target