摘要
本文基于截面模型系统研究了碳离子与氢等离子体相互作用的电荷态演化行为.首先探究了在碳离子入射能为1 keV/u—100 MeV/u、氢等离子体的电子温度为kT_(e)=1—1000 eV范围内引入“shift”麦克斯韦速率分布对双电子复合速率系数影响的规律,首次给出该体系下的速率系数数据.在此基础上具体求解了在炮弹碳离子的能量为0.5 MeV/u、等离子体自由电子温度为kT_(e)=3和8 eV、电子密度为N_(e)=10^(18)—10^(20) cm^(-3)的情况下包含各种电离及复合过程的平衡速率方程,给出了碳离子穿过氢等离子体的非平衡和平衡电荷态丰度随等离子体厚度的演化关系,揭示了等离子体状态(温度、密度),炮弹离子能量及初始电荷态对炮弹离子电荷态演化的调控机制.进一步,通过对比碳离子在氢等离子体与中性气体(氢气)中的动力学行为差异,阐明了等离子体环境对离子电荷交换的独特影响.本研究将对高能量密度物理领域中离子与等离子体相互作用的动力学演化及能量输运特性的研究具有重要参考作用.
In this paper,the charge state evolution behavior of carbon ions interacting with hydrogen plasma is systematically investigated based on a cross-sectional model.First,the influence of introducing a“shifted”Maxwellian velocity distribution on the dielectronic recombination rate coefficients is investigated within the range of carbon ion incident energies from 1 keV/u to 100 MeV/u and hydrogen plasma electron temperatures of kT_(e)=-1000 eV.The rate coefficient data for this system are provided.On this basis,this research specifically solves the equilibrium rate equations by taking into account various ionization and recombination processes for projectile carbon ions with an energy of 0.5MeV/u,plasma electron temperatures of kT_(e)=3eV and 8eV,and electron densities ranging from 10^(18)cm^(-3)to 10^(20)cm^(-3).The results show that the abundance of both non-equilibrium and equilibrium charge states of carbon ions passing through hydrogen plasma varies with plasma thickness,revealing how plasma conditions such as temperature and density,along with projectile ion energy and initial charge states,influence the evolution of the ion charge states.Furthermore,a comparison of the dynamic behaviors of carbon ions in hydrogen plasma and neutral gas(hydrogen)shows that the unique effects of the plasma environment on ion charge exchange are elucidated.The mean equilibrium charge state of projectile ions exhibits a positive correlation with electron temperature and a negative correlation with electron density.It is particularly important that the calculated equilibrium charge states in hydrogen gas targets are notably lower than those in plasma environments.As the initial charge state of projectile ions approaches its equilibrium value,the equilibrium thicknesses for all charge states demonstrate a decreasing trend,accompanied by a corresponding reduction in the mean equilibrium thickness.This phenomenon is consistently verified in both plasma and gas targets,with the mean equilibrium thickness values in gas targets being significantly smaller than those in plasma environments.Most importantly,when the initial charge state of projectile ions exceeds the equilibrium value,these ions display more pronounced energy loss characteristics in non-equilibrium regions.This study will provides important references for investigating the dynamic evolution and energy transport characteristics of ion-plasma interactions in the field of high-energy-density physics.
作者
张崇瑞
何文亮
曹世权
颉录有
董晨钟
ZHANG Chongrui;HE Wenliang;CAO Shiquan;XIE Luyou;DONG Chenzhong(Key Laboratory of Atomic and Molecular Physics&Functional Material of Gansu Province,College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,China)
出处
《物理学报》
北大核心
2025年第18期225-238,共14页
Acta Physica Sinica
基金
国家自然科学基金(批准号:12374384,12204382)
中央引导地方科技发展资金(批准号:23ZYQA293)
国家重点研发计划(批准号:2022YFA1602500)
西北师范大学青年教师科研能力提升计划(批准号:NWNU-LKQN2021-05)资助的课题.
关键词
有效电荷
电荷交换
双电子复合
电荷态分布
effective charge
charge exchange
dielectronic recombination
charge-state distribution
