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Two-stage laser acceleration of high quality protons using a tailored density 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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Contributor : Pierre Zaparucha <>
Submitted on : Tuesday, March 5, 2019 - 11:45:25 AM
Last modification on : Thursday, October 15, 2020 - 2:42:04 PM

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Y. Wan, I. a. Andriyash, J. f. Hua, C.-H. Pai, W. Lu, et al.. Two-stage laser acceleration of high quality protons using a tailored density plasma. Physical Review Accelerators and Beams, American Physical Society, 2019, 22 (2), ⟨10.1103/PhysRevAccelBeams.22.021301⟩. ⟨hal-02057367⟩



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