Laser-driven radiation sources are attracting increasing attention for several materials science applications. While laser-driven ions, electrons and neutrons have already been considered to carry out the elemental characterization of materials, the possibility to exploit high energy photons remains unexplored. Indeed, the electrons generated by the interaction of an ultra-intense laser pulse with a near-critical material can be turned into high energy photons via bremsstrahlung emission when shot into a high-Z converter. These photons could be effectively exploited to perform Photon Activation Analysis (PAA). In the present work, the possibility to perform laser-driven PAA is proposed and investigated. By means of a theoretical and numerical approach, we identify the optimal near-critical material and converter parameters for laser-driven PAA in a wide range of laser intensities. Finally, exploiting the Monte Carlo and Particle-In-Cell tools, we simulate PAA experiments performed with both conventional accelerators and laser-driven sources.
Electric field dynamics and ion acceleration in the self-channeling of a superintense laser pulse
本文用一维静电有质动力学模型研究了相对论强度的激光脉冲在低密度等离子体中传播时产生电场和离子径向加速的动力学过程，该模型用于解释电场的实验测量[S. Kar等人，New J. Phys. *9*，402（2007）]。离子在空间上聚焦在电荷位移通道的边缘，导致流体动力学破裂，这又导致电子加热和电场中的“回波”效应。在通道的中心区域中的完全电子耗尽的开始导致到“库仑爆炸”制度的平滑过渡和离子加速的饱和。
Relativistic Self-Induced Transparency Effect During Ultraintense Laser Interaction with Overdense Plasmas: Why It Occurs and Its Use for Ultrashort Electron Bunch Generation
Probing In-Solid Proton Energy Distributions in Laser-Driven Fusion via Nuclear Activation Diagnostics
The University of Osaka（大阪大学）；Institute of Laser Engineering, The University of Osaka（大阪大学激光工程研究所）；Graduate School of Advanced Science and Engineering, Hiroshima University（广岛大学先进理工学研究科）
