Anomalous Ion Acceleration Mechanism in Intense Laser-Irradiated Graphene

强激光照射石墨烯中的反常离子加速机制

• 批准号: 22KJ0236
• 负责人: KUMAR HARIHARA SUDHAN
• 金额: $ 1.09万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2023
• 资助国家: 日本
• 起止时间: 2023-03-08 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22KJ0236/
• 关键词: Laser acceleration; Hybrid simulation; Molecular Dynamics; Particle-in-cell; RPA; TNSA; Graphene

The motivation of this research is to identify the anomalous acceleration mechanism due to which, extremely high energy carbon ions are generated only from an ultra-thin graphene target, when irradiated with an ultra-intense laser. The hypothesis was that the laser prepulse modifies the target structure thus affecting the ion acceleration. However, there were no pre-existing methods to test this hypothesis. Hence, we proposed a hybrid simulation scheme where the prepulse is modeled using molecular dynamics (MD) simulation and then combined with electromagnetic (EM) plasma simulation for the main pulse. Over the FY2022, we succeeded in creating a hybrid simulation that combines MD and EM simulations. The validation study for this simulation showed good agreement with a previous experiment.

这项研究的动机是确定异常加速机制，由于该机制，当用超强激光照射时，仅从超薄石墨烯靶产生极高能量的碳离子。假设激光预脉冲改变了靶的结构，从而影响离子加速。然而，没有预先存在的方法来检验这一假设。因此，我们提出了一种混合模拟方案，其中预脉冲建模使用分子动力学（MD）模拟，然后结合电磁（EM）等离子体模拟的主脉冲。于2022财政年度，我们成功创建了结合MD和EM模拟的混合模拟。该模拟的验证研究与以前的实验显示出良好的一致性。