Staged laser acceleration of high quality protons from a tailored plasma

Abstract : A new scheme for a laser-driven proton accelerator based on a sharply tailored near-critical-density plasma target is proposed. The designed plasma profile allows for the laser channeling of the dense plasma, which triggers a two-stage acceleration of protons—first accelerated by the laser acting as a snowplow in plasma, and then by the collisionless shock launched from the sharp density downramp. Thanks to laser channeling in the near-critical plasma, the formed shock is radially small and collimated. This allows it to generate a significant space-charge field, which acts as a monochromator, defocusing the lower energy protons while the highest ones remain collimated. Our theoretical and numerical analysis demonstrates production of high-energy proton beams with few tens of percent energy spread, few degrees divergence angle and charge up to few nC. With a PW-class ultrashort laser this scheme predicts the generation of such high quality proton beams with energies up to several hundreds of MeV.
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Submitted on : Tuesday, October 9, 2018 - 1:56:17 PM
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Y. Wan, I.A. Andriyash, J.F. Hua, C.-H. Pai, W. Lu, et al.. Staged laser acceleration of high quality protons from a tailored plasma. Phys.Rev.Accel.Beams., 2019, 22, pp.021301. ⟨10.1103/PhysRevAccelBeams.22.021301⟩. ⟨hal-01891250⟩



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