We present results of 2D particle-in-cell (PIC) simulations of carbon ion acceleration by 10 petawatt (PW) laser pulses, studying both circular polarized (CP) and linear polarized (LP) pulses. We carry out a thickness scanning of a solid carbon target to investigate the ideal thickness for carbon ion acceleration mechanisms using a 10 PW laser with an irradiance of 5 × 10 22 W cm −2 . The energy spectra of carbon ions and electrons and their temperature are studied. Additionally, for the carbon ions, their angular divergence is studied. It is shown that the ideal thickness for the carbon acceleration is 120 nm and the cutoff energy for carbon ions is 5 and 3 GeV for CP and LP pulses, respectively. The corresponding carbon ions temperature is ~1 and ~0.75 GeV. On the other hand, the energy cutoff for the electrons is ~500 MeV with LP and ~400 MeV with CP laser pulses. We report that the breakout afterburner mechanism is most likely causing the acceleration of carbon ions to such high energies for the optimal target thickness.

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ELI-NP 上 10 个 PW 激光脉冲对碳离子加速的模拟

我们展示了 10 拍瓦 (PW) 激光脉冲对碳离子加速的 2D 细胞内粒子 (PIC) 模拟结果，研究了圆偏振 (CP) 和线偏振 (LP) 脉冲。我们使用辐照度为 5 × 10 22 W cm -2 的 10 PW 激光对固体碳靶进行厚度扫描，以研究碳离子加速机制的理想厚度。研究了碳离子和电子的能谱及其温度。此外，对于碳离子，研究了它们的角散度。结果表明，碳加速的理想厚度为 120 nm，碳离子的截止能量分别为 5 GeV 和 3 GeV，CP 和 LP 脉冲。相应的碳离子温度为 ~1 和 ~0.75 GeV。另一方面，LP 激光脉冲的电子能量截止为 ~500 MeV，CP 激光脉冲为 ~400 MeV。我们报告说，突破加力燃烧室机制最有可能导致碳离子加速到如此高的能量以获得最佳目标厚度。