外加磁场对螺旋等离子体的影响  

Effect of external magnetic field on helix plasma plume

作　　者：胡杨 罗婧怡 蔡雨烟 卢新培[2] Hu Yang;Luo Jing-Yi;Cai Yu-Yan;Lu Xin-Pei(CETC Chips Technology Group Co.,LTD,Chongqing 400060,China;School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]中电科芯片技术(集团)有限公司,重庆400060 [2]华中科技大学电气与电子工程学院,武汉430074

出　　处：《物理学报》2023年第13期28-34,共7页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2021YFE0114700);国家自然科学基金(批准号:52130701,51977096)资助的课题。

摘　　要：在低气压、氮气环境及无外加磁场的情况下发现了一种新型等离子体,因其具有规则的螺旋传播模式,被称为螺旋等离子体.尽管已经对该螺旋等离子体的关键特性进行了大量研究,螺旋等离子体的形成机理仍未理清,这影响其在材料、纳米技术上的应用.通过在不同手性的螺旋等离子体外施加磁场,研究外加磁场对螺旋等离子体的调控行为,发现外加磁场将会使得螺旋等离子体发生收缩、拉伸等行为.并且,外加磁场还会影响螺旋等离子体的手性和螺旋形态的清晰度.通过电磁波理论计算螺旋等离子体的径向电场,理清外加磁场影响螺旋等离子体行为的机理,发现洛伦兹力的磁场力分量是外加磁场调控螺旋等离子体行为的原因.本文为理解螺旋等离子体的运动行为打下理论基础,有利于将来在材料、纳米技术等领域的实际应用.Electric phenomena and magnetic phenomena are inseparable.The magnetic field affects the ionization balance and spatial distribution of the plasma.A new type of plasma discharges has been found in nitrogen gas under sub atmospheric pressure condition without external magnetic field.Because of its regular helical propagation pattern,it is called helical plasma(HP)plume.Although a great deal of research has been carried out on the key characteristics of the HP plume,the formation mechanism of it remains unclear,which affects its applications in materials and nanotechnology.By applying magnetic field to HP with different chirality,the regulation behavior of the external magnetic field on HP is studied.It is found that the external magnetic field will make the HP shrink or stretch.With the magnetic field intensity increasing from 0 mT to 200 mT,the left-handed HP plume stretches under the magnetic field of S-pole.Conversely,the left-handed chiral HP plume contracts when the magnetic pole changes to N-pole.However,when the chirality of HP plume is changed to being right-handed by adjusting voltage,phenomenon opposite to the previous one is observed.Moreover,the applied magnetic field also affects the divergence of HP.With the increase of S-pole external magnetic field,the HP plume stretches until the external magnetic field reaches to 80 mT.When the magnetic field intensity is 80 mT,the HP disappears.The plasma in the quartz tube appears in the divergent form.With the magnetic field intensity increasing to 160 mT,the plasma in the form of a helix appears again.Finally,in the process of changing the intensity of the magnetic field,the clarity of the HP plume will also change.The radial electric field of HP is calculated by electromagnetic wave theory,and the mechanism of the influence of external magnetic field on the behavior of HP is clarified.It is found that the magnetic field force component of Lorentz force is responsible for the external magnetic field regulating the HP behavior.This study lays a theoretical fou

关 键 词：大气压等离子体 等离子体射流 非平衡等离子体 电流体动力学 

分 类 号：O53[理学—等离子体物理]