用于超高强度激光驱动离子诊断的汤姆逊抛物线谱仪的研制：模拟与数值分析

中文摘要 AI 辅助

本文设计并研制了一种汤姆逊抛物线离子谱仪（TPIS），用于诊断MeV能量范围内的激光加速离子束。该TPIS已在拍瓦激光装置的离子加速实验中得到验证。借助数值模拟软件开展了必要的模拟工作，以评估电场和磁场的分布，从而辅助选择谱仪的几何结构，同时最大程度减小边缘场效应。从模拟结果中推导出了考虑电磁场分布空间变化的解析色散表达式，由这些表达式得到的离子偏转结果，与采用恒定场假设时相比，与实验测得的质子轨迹吻合度更高。自行研制的TPIS已接受磁场测量，其结果与模拟的场分布高度一致。该TPIS具备更换无场漂移区域的功能，展现出可在宽能量范围及不同实验装置中使用的灵活性。随后，该谱仪被用于探测来自薄铝箔靶的激光加速离子束，相关实验证明了该谱仪具备以足够的间距分辨多种离子种类的能力。所研制的TPIS为高能量激光-等离子体实验提供了一种紧凑、灵活且精准的诊断工具。

英文摘要

A Thomson parabola ion spectrometer (TPIS) has been designed and developed for diagnostics of laseraccelerated ion beams in the MeV energy range. The TPIS has been validated by ion acceleration experiment at petawatt laser facility. Necessary simulations to evaluate the electric and magnetic field distributions have been performed with the help of a numerical simulation software to aid the selection of the spectrometer geometry while minimising fringe-field effects. Analytical dispersion expressions have been formulated from the simulations that take into account the spatial variation in the electromagnetic field profiles. The ion deflections obtained from these expressions demonstrate an improved agreement with experimentally measured proton trajectories compared to the case when constant fields are considered. The TPIS hence fabricated in-house has been subject to magnetic field measurements, which are in excellent agreement with the simulated field profile. The TPIS has the provision to change the field-free drift region, showcasing flexibility to be employed over a broad energy range and with different experimental setups. The spectrometer has been subsequently used for detecting laser-accelerated ion beams from thin aluminum foil targets. These experiments have demonstrated the capability of the spectrometer to resolve multiple ion species with sufficient separation between them. The developed TPIS provides a compact, flexible and accurate diagnostic for high-energy laser-plasma experiments.

发表机构

• Physical Research Laboratory（物理研究实验室）
• Raja Ramanna Centre for Advanced Technology（拉贾·兰纳高级技术中心）

机构由 AI 辅助整理，请以论文原文为准。