论文标题
高能量密度实验中非热离子光谱的基于核基于热离子的诊断方案
A Nuclear-Based Diagnostic Scheme for Nonthermal Ion Spectrum in High Energy Density Plasmas Experiments
论文作者
论文摘要
事实证明，与麦克斯韦的能量分布的等离子体系统中的核反应被证明具有某些独特的特征，包括其产品能量谱。基于此，提出了一种新的核诊断方案，用于测量高能量密度等离子体中的非热离子能谱，其中，在其中，非热离子能量光谱的有效温度和光谱峰是由产品能能谱的光谱宽度和光谱峰唯一确定的。然后，以激光驱动的磁重新连接实验为例，根据粒子中的模拟结果，与质子 - 波隆（Pb）融合反应相结合，PB反应速率增加了4个数量级。同时，乘积光谱峰和光谱宽度向更高的能量转移，偏离了热平衡假设的预测，这两者都是由于磁重新连接中的加速和加热的超颗粒质子。此外，在分析一系列模拟结果时，发现了适用于激光驱动磁重新连接参数范围的新产品频谱分析方法。
The nuclear reactions in a plasma system with energy distribution deviated from Maxwellian are proved to have some unique characteristics including those in their product energy spectrum. Based on this, a new nuclear diagnostic scheme for measuring the nonthermal ion energy spectrum in high-energy-density plasmas is proposed, where the effective temperature and spectral peak of the nonthermal ion energy spectrum are uniquely determined by the spectral width and spectral peak of the product energy spectrum. Then, taking the laser-driven magnetic reconnection experiment as an example, according to the particle-in-cell (PIC) simulation results coupled with the proton-boron (pB) fusion reaction, the pB reaction rate is increased by 4 orders of magnitude; meanwhile, the product spectral peak and spectral width are shifted towards higher energy, deviating from the predictions of the thermal equilibrium assumption, both of which are on account of the accelerated and heated suprathermal protons in magnetic reconnection. Furthermore, analyzing a series of simulation results, the new product spectrum analysis approach suitable for the parameter range of laser-driven magnetic reconnection is found.
