Abstract
A new scheme is proposed to improve the quality of proton beams via ultra-intense laser pulse interacting with double plasma targets, which consist of a pre-target with relatively low density and a main target with high density. Both one- and two-dimensional Particle-in-Cell simulations show that, the using of an appropriate pre-target can help to obtain a much stronger longitudinal charge separation field in contrast to using only the main target. And proton beam with lower momentum divergence, better monochromaticity and collimation, as well as higher current density is generated. Moreover, due to the strengthened coupling between the laser pulse and targets, the energy conversion from laser pulse to protons is also increased.
Highlights
Past decades have seen rapid developments in laser physics after the appearance of chirped pulse amplification (CPA) technology, and the laser intensity up to 1022W /cm[2] has been demonstrated.[1]
With the availability of ultra-short, ultra-intense laser pulses in laboratories, a new regime for high-energy-density physics has been opened and increasing attention has been attracted for its significance in the inertial confinement fusion (ICF),[2] novel radiation sources,[3] charged particle acceleration[4,5] and laboratory astrophysics.[6]
The maximum energy an ion can obtain from the laser pulse is proportional to the intensity of laser pulse and the cube root of acceleration time or distance theoretically,[23,24] yet the focused peak intensity of laser is always limited by the material breakdown threshold in practice,[25] and many other undesirable effects such as instabilities come to appear over long interaction time.[26]
Summary
Past decades have seen rapid developments in laser physics after the appearance of chirped pulse amplification (CPA) technology, and the laser intensity up to 1022W /cm[2] has been demonstrated.[1]. Improving the quality of proton beams via double targets driven by an intense circularly polarized laser pulse
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