Revisit of recombination processes of low-charge-state ion generation during picosecond intense laser–gas interaction

Deng, Yanqing; Zhang, Qi; Yue, Dongning; Wei, Wenqing; Feng, Lei; Cui, Yun; Ma, Yunlong; Liu, Feng; Yang, Yuntao; Huang, Zheng; Yuchi, Wu; Zhou, Weimin; Weng, Shangkun; Liu, Feng; Chen, Min; Yuan, Xiaohui; Zhang, Jie

doi:10.1063/5.0120751

Cited by 2 publications

(1 citation statement)

References 42 publications

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“…It is highly desired to promote simple methods to generate a quasi-monoenergetic proton beam with low divergence for the coming petawatt (PW) laser systems. Recently, with the application of supersonic gas jet and nanosecond laser reshaping technology, the manufacture of a near-critical-density (NCD) plasma has made remarkable progress, [20][21][22][23][24] and there are some experimental results of laser-driven ion acceleration based on laser NCD plasmas interaction. [24,25] In this paper, we propose to adopt a relativistic Laguerre-Gaussian (LG) laser pulse with an intrinsic hollow intensity distribution to accelerate and focus a proton beam in a nearcritical-density (NCD) target.…”

Section: Introductionmentioning

confidence: 99%

Efficient ion acceleration driven by a Laguerre–Gaussian laser in near-critical-density plasma

2023

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Laser-driven ion accelerators have the advantages of compact size, high density, and short bunch duration over conventional accelerators. Nevertheless, it is still challenging to generate ion beams with quasi-monoenergetic peak and low divergence in experiments with the current ultra-high intensity laser and thin target technologies. Here we propose a scheme that a Laguerre Gaussian laser irradiates a near-critical-density (NCD) plasma to generate a quasi-monoenergetic and low-divergence proton beam. The Laguerre Gaussian laser pulse in a NCD plasma excites a moving longitudinal electrostatic field with a large amplitude, and it maintains the inward bowl-shape for dozens of laser durations. This special distribution of the longitudinal electrostatic field can simultaneously accelerate and converge the protons. Our particle-in-cell (PIC) simulation shows that the efficient proton acceleration can be realized with the Laguerre Gaussian laser intensity ranging from 3.9 × 1021 W · cm -2 - 1.6 × 1022 W · cm -2available in the near future, e.g., a quasi-monoenergetic proton beam with peak energy ~115 MeV and divergence angles less than 50 can be generated by a 5.3 × 1021 W · cm -2 pulse. This work could provide a reference for the high-quality ion beam generation with PW-class laser systems available recently.

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Section: Introductionmentioning

confidence: 99%

Efficient ion acceleration driven by a Laguerre–Gaussian laser in near-critical-density plasma

2023

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Generation of collisionless electrostatic shock waves in interaction between strong intense laser and near-critical-density plasma

Dong-Ning¹,

Dong²,

Chen³

et al. 2023

Acta Phys. Sin.

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The generations of weak and strong collisionless electrostatic shock waves (CESWs) have been studied by the one-dimensional particle-in-cell simulations in the strong intense laser near critical density plasma interactions. The effects of the ranges of plasma density profiles, non-relativistic and relativistic laser intensities on the generations of CESWs have been explored in the paper. The non-relativistic drive laser generates the weak CESW in laser near critical density plasma interactions with the weak intensity. The electron spectra show double-temperature distributions because the non-relativistic drive laser cannot heat the electrons adequately. The low-temperature electrons have an important influence on the generations of weak CESWs and they also cause that the protons can be accelerated and reflected from the CESWs. The spectra of the weak CESWs protons show a continuously distributed profile. When the range of plasma density up-ramp is large, the process can be observed that the post-soliton structure evolves into the ion acoustic wave and further evolves into the weak collisionless electrostatic shock wave. When the drive laser intensity is relativistic, the electrons are adequately heated to a single relativistic temperature. The effects of the ranges of plasma density profiles on the generations of CESWs have been further analyzed and we found:1) when the range of plasma density up-ramp is large, the potential barrier of ion acoustic wave is shielded by the hot electrons; 2) when the range of plasma density up-ramp is small, the effective distance (i.e., the Debye length) of accelerating field is larger and the endurance time is longer than the case of large plasma density up-ramp range. This makes the ion acoustic wave structure more stable during its forward propagation process. When the velocity difference between the ion acoustic wave accelerating protons and the target normal sheath accelerating protons satisfies the proton reflection condition of CESW, the ion acoustic wave further evolves into the strong CESW and generates monoenergetic protons at the same time.

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Revisit of recombination processes of low-charge-state ion generation during picosecond intense laser–gas interaction

Cited by 2 publications

References 42 publications

Efficient ion acceleration driven by a Laguerre–Gaussian laser in near-critical-density plasma

Efficient ion acceleration driven by a Laguerre–Gaussian laser in near-critical-density plasma

Generation of collisionless electrostatic shock waves in interaction between strong intense laser and near-critical-density plasma

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