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Ion acceleration in electrostatic collisionless shock: on the optimal density profile for quasi-monoenergetic beams

机译:静电碰撞冲击中的离子加速:对准单元束的最佳密度曲线

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摘要

A numerical study on ion acceleration in electrostatic shock waves is presented, with the aim of determining the best plasma configuration to achieve quasi-monoenergetic ion beams in laser-driven systems. It was recently shown that tailored near-critical density plasmas characterized by a long-scale decreasing rear density profile lead to beams with low energy spread (Fiuza et al 2012 Phys. Rev. Lett. 109 215001). In this work, a detailed parameter scan investigating different plasma scale lengths is carried out. As result, the optimal plasma spatial scale length that allows for minimizing the energy spread while ensuring a significant reflection of ions by the shock is identified. Furthermore, a new configuration where the required profile has been obtained by coupling micro layers of different densities is proposed. Results show that this new engineered approach is a valid alternative, guaranteeing a low energy spread with a higher level of controllability.
机译:介绍了静电冲击波离子加速度的数值研究,目的是确定最佳等离子体配置,以实现激光驱动系统中的准单体离子束。 最近表明,定制了近临界密度等离子体,其特征在于长尺寸减小的后密度型材导致具有低能量扩散的梁(Fiuza等,2012 Phy。Rev. Lett。109 215001)。 在这项工作中,执行调查不同等离子体刻度长度的详细参数扫描。 结果,识别出允许最小化能量扩散的最佳等离子体空间刻度长度,同时确保通过冲击确保离子的显着反射。 此外,提出了通过耦合不同密度的微层获得所需轮廓的新配置。 结果表明,这种新的工程方法是一个有效的替代方案,保证低能量扩散,可控性水平。

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