激光对宽能域碳离子在双组份等离子体中阻止本领的影响  

Effect of laser on the stopping power of a large range energeticCarbon ion in a two-component plasma

作　　者：伊合 王桂秋 王时萱 高鑫 刘大军 Yi He;Wang Guiqiu;Wang Shixuan;Gao Xin;Liu Dajun(College of Science,Dalian Maritime University,Dalian 116026,China;School of Environmental Science and Engineering,Dalian Maritime University,Dalian 116026,China)

机构地区：[1]大连海事大学理学院,辽宁大连116026 [2]大连海事大学环境科学与工程学院,辽宁大连116026

出　　处：《强激光与粒子束》2024年第3期100-105,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11875096)。

摘　　要：在线性化伏拉索夫-泊松模型基础上研究了激光辐照下碳离子在双组份等离子体中的阻止本领,重点讨论了不同激光振幅、激光频率、激光角度、等离子体密度和等离子体电子温度对阻止本领的影响。研究结果表明,在全域范围内,激光对阻止本领的影响都非常明显。在低能区域(入射速度为等离子体电子热速度的0~0.1倍),碳离子的阻止本领主要来自于等离子体中离子的贡献,特别是在入射速度约为等离子体离子热速度时,阻止本领出现了第一个峰值;在中高能区域(入射速度大于0.1倍的等离子体电子热速度),碳离子的能量损失主要来自于等离子体中电子的贡献,特别是在入射速度约为等离子体电子热速度的1.5倍时,阻止本领出现了第二个峰值。碳离子在等离子体中阻止本领的这种双峰结构体现了不同能量区域等离子体中离子和电子对阻止本领的贡献。另一方面,激光强度或激光频率的增加削弱了阻止本领,阻止本领会随着等离子体密度的增加或电子温度的降低而增强,特别是由于离子引起的低能峰与电子引起的高能峰相比阻止本领的增强更明显。This paper,studies the influence of laser on the stopping power of a carbon ion in a two-component plasma,with emphasis on the effects of different laser amplitude,laser frequency,laser angle,plasma density,and plasma temperature on the stopping power based on the linearized Vlasov-Poisson model and molecular dynamics simulation.The research results show that the influence of laser on stopping power is very obvious in all the projectile region.In the low energy region(the magnitude of incident velocity is 0-0.1 plasma electron thermal velocity),the energy loss of the carbon ion mainly comes from the contribution of ions in the plasma,especially when the incident velocity is around the plasma ion thermal velocity,the first peak of stopping power occurs.In the medium and high energy region(the magnitude of incident velocity is greater than 0.1 plasma electron thermal velocity),the energy loss of the carbon ion mainly comes from the contribution of electrons in the plasma,especially when the magnitude of incident velocity is around 1.5 times the plasma electron thermal velocity,the second peak of stopping power occurs.The bimodal structure of the stopping power of the carbon ion in the plasma reflects the contribution of ions and electrons to the stopping power in different energy regions.On the other hand,the increase of laser intensity or laser frequency can decrease the stopping power of the carbon ion.The stopping power will be enhanced with the increase of plasma density or the decrease of electron temperature.Such an enhancement is more significant for stopping power for the low energy peak caused by ions compared to high energy peak caused by electrons.

关 键 词：离子 双组份等离子体 阻止本领 激光 

分 类 号：O532.13[理学—等离子体物理]