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000408794 1001_ $$0P:(DE-HGF)0$$aSharma, Ashutosh$$b0$$eCorresponding author
000408794 245__ $$aHigh Energy electron and proton acceleration by circularly polarized laser pulse from near critical density hydrogen gas target
000408794 260__ $$aLondon$$bNature Publishing Group$$c2018
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000408794 520__ $$aRelativistic electron rings hold the possibility of very high accelerating rates, and hopefully a relatively cheap and compact accelerator/collimator for ultrahigh energy proton source. In this work, we investigate the generation of helical shaped quasi-monoenergetic relativistic electron beam and high-energy proton beam from near critical density plasmas driven by petawatt-circularly polarized-short laser pulses. We numerically observe the efficient proton acceleration from magnetic vortex acceleration mechanism by using the three dimensional particle-in-cell simulations; proton beam with peak energy 350 MeV, charge ~10nC and conversion efficiency more than 6% (which implies 2.4 J proton beam out of the 40 J incident laser energy) is reported. We detailed the microphysics involved in the ion acceleration mechanism, which requires investigating the role of self-generated plasma electric and magnetic fields. The concept of efficient generation of quasi-monoenergetic electron and proton beam from near critical density gas targets may be verified experimentally at advanced high power – high repetition rate laser facilities e.g. ELI-ALPS. Such study should be an important step towards the development of high quality electron and proton beam.
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000408794 773__ $$0PERI:(DE-600)2615211-3$$a10.1038/s41598-018-20506-x$$gVol. 8, no. 1, p. 2191$$n1$$p2191$$tScientific reports$$v8$$x2045-2322$$y2018
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