半球形阴极线性等离子体推进装置升级模拟

IF 2 3区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Physics of Plasmas Pub Date : 2024-08-22 DOI:10.1063/5.0191580
M. E. Abdel-kader
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引用次数: 0

摘要

电磁等离子体推进是由线性等离子体推进(LPP)装置产生的。LPP 设备经过升级,可在 5.4 kJ 的最大能量下运行和模拟。作为升级过程的一部分,阴极的圆柱形上部变成了半球形,以提高电流鞘(CS)的加速度。根据模型,电流鞘以线速度沿 z 方向运动,同时以角速度沿 θ 方向运动。当等离子体受到挤压和压缩时,它被驱动通过延伸管。该模型用四个阶段描述了希尔思运动、其特征和被推动的等离子体:轴向阶段、角径向阶段、反射阶段和膨胀阶段。为了证明模型假设的正确性,对模拟的 Ith 和实验的 Iex 电流信号进行了比较,Ith 和 Iex 的值分别为 89.7 和 88 kA。结果表明,在角径向阶段,随着运动角度的增大,CS 被压缩、拉长并被迫进入延伸管。结果显示,等离子体电感、速度、温度和推动等离子体长度的峰值分别为 36.3 nH、6.36 cm/μs、6.72 eV 和 3.22 cm。
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Simulation of hemispherical cathode-based linear plasma propulsion device upgrade
Electromagnetic plasma propulsion is generated by the linear plasma propulsion (LPP) apparatus. The LPP device is upgraded to operate and simulate at a maximum energy of 5.4 kJ. The cathode's cylindrical upper portion is changed into a hemispherical shape as part of the upgrading process to boost the current sheath (CS) acceleration. According to the model, the CS moves in the z-direction with a linear velocity while moving in the θ-direction with an angular velocity. When the plasma is squeezed and compressed, it is driven through the extension tube. The model describes the CS motion, its characteristics, and the propelled plasma using four phases: an axial, an angular radial, a reflected, and an expansion phases. The simulated Ith and experimental Iex current signals were compared to prove the validity of the model assumption, where the values of Ith and Iex were 89.7 and 88 kA, respectively. According to the results, as the motion angle increases in the angular radial phase, the CS compresses, elongates, and is forced into the extension tube. The results showed that the peaks of both plasma inductance, velocity, temperature, and propelled plasma length were 36.3 nH, 6.36 cm/μs, 6.72 eV, and 3.22 cm, respectively.
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来源期刊
Physics of Plasmas
Physics of Plasmas 物理-物理:流体与等离子体
CiteScore
4.10
自引率
22.70%
发文量
653
审稿时长
2.5 months
期刊介绍: Physics of Plasmas (PoP), published by AIP Publishing in cooperation with the APS Division of Plasma Physics, is committed to the publication of original research in all areas of experimental and theoretical plasma physics. PoP publishes comprehensive and in-depth review manuscripts covering important areas of study and Special Topics highlighting new and cutting-edge developments in plasma physics. Every year a special issue publishes the invited and review papers from the most recent meeting of the APS Division of Plasma Physics. PoP covers a broad range of important research in this dynamic field, including: -Basic plasma phenomena, waves, instabilities -Nonlinear phenomena, turbulence, transport -Magnetically confined plasmas, heating, confinement -Inertially confined plasmas, high-energy density plasma science, warm dense matter -Ionospheric, solar-system, and astrophysical plasmas -Lasers, particle beams, accelerators, radiation generation -Radiation emission, absorption, and transport -Low-temperature plasmas, plasma applications, plasma sources, sheaths -Dusty plasmas
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