Physics of Plasmas最新文献_第10页

Virial relations for elongated plasmas in tokamaks: Analytical approximations and numerical calculations 托卡马克中拉长等离子体的室温关系：分析近似和数值计算

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-02 DOI: 10.1063/5.0221175

A. A. Martynov, V. D. Pustovitov

引用次数: 0

Experiments and gyrokinetic simulations of the nonlinear interaction between spinning magnetized plasma pressure filaments 旋转磁化等离子体压力丝之间非线性相互作用的实验和陀螺动力学模拟

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-02 DOI: 10.1063/5.0213345

R. D. Sydora, T. Simala-Grant, S. Karbashewski, F. Jimenez, B. Van Compernolle, M. J. Poulos

引用次数: 0

Nonlinear scaling of photon radiation power in relativistic plasma current filamentation instability with beam parameters 相对论等离子体电流丝状不稳定性中光子辐射功率随光束参数的非线性缩放

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-02 DOI: 10.1063/5.0210348

Zhang-Hu Hu, Wen-Yuan Zhai, Jie-Jie Lan, You-Nian Wang

引用次数: 0

Statistical characterization of high voltage vacuum surface flashover with gapped and ungapped anodes 有间隙和无间隙阳极高压真空表面闪蒸的统计特征

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-02 DOI: 10.1063/5.0214059

M. Mounho, C. Fuksa, R. Clark, W. Brooks, M. Hopkins, A. Steiner, A. Neuber, J. Stephens

引用次数: 0

The effect of energetic electrons in lunar ionosphere on the streaming plasma instability around moon 月球电离层中的高能电子对月球周围流等离子体不稳定性的影响

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-02 DOI: 10.1063/5.0201367

Vipin K. Yadav, Mahima Agarwal, Mehul Chakraborty, Rajneesh Kumar

{"title":"The effect of energetic electrons in lunar ionosphere on the streaming plasma instability around moon","authors":"Vipin K. Yadav, Mahima Agarwal, Mehul Chakraborty, Rajneesh Kumar","doi":"10.1063/5.0201367","DOIUrl":"https://doi.org/10.1063/5.0201367","url":null,"abstract":"The analytical study of the two-stream instability (TSI) generation is carried out in the lunar ionosphere. The solar wind is considered an electron beam, which interacts with the lunar ionosphere, generated due to the photoionization of the lunar neutrals by the extreme ultraviolet component of the solar radiation. In this interaction process, the lunar electrons constitute the background plasma as the ion population is considerably low in the lunar plasma environment. In the present study along with the non-energetic (“cold”) electrons, which are in the majority, a fraction of energetic electrons (“hot”) of the total lunar electron population are also considered and the fraction of energetic electrons is taken in the range of 1%–25% of the total lunar electron count. The particle-in-cell simulations suggest that the presence of energetic electrons in the lunar plasma environment hastens the electron bunching during the interaction with the incoming solar wind electrons during the TSI. The energetic electrons in the lunar plasma environment are capable of triggering non-linear phenomena, such as the generation of lunar plasma waves. The inclusion of hot electrons in the lunar plasma ambiance changes the scenario for the TSI to occur in the lunar ionosphere, and the analysis shows that it modifies the TSI dispersion relation and can have a significant impact on the growth and decay of the TSI and its threshold for generation in a lunar plasma environment.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141883809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characteristics and mechanism of low-field peak in argon helicon plasma of single loop antenna 单环天线氩氦等离子体低场峰的特征和机制

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-01 DOI: 10.1063/5.0213521

Zhangyu Xia, Tianliang Zhang, Ying Cui, Bocong Zheng, Jiting Ouyang

{"title":"Characteristics and mechanism of low-field peak in argon helicon plasma of single loop antenna","authors":"Zhangyu Xia, Tianliang Zhang, Ying Cui, Bocong Zheng, Jiting Ouyang","doi":"10.1063/5.0213521","DOIUrl":"https://doi.org/10.1063/5.0213521","url":null,"abstract":"Low magnetic field density peak (LFP) is a typical nonlinear phenomenon in helicon wave discharge, which is characterized by the nonlinear increase in electron density with the magnetic field in lower magnetic fields. In this paper, the characteristics and generation mechanism of LFPs of argon helicon wave plasma excited by m = 0 single-loop antenna are studied by experiment and numerical simulation. Experimental results show that plasma density shows two peaks at increasing magnetic field in the range of 0–100 G. The first peak appears around 10 G, and the second one appears between 30 and 50 G. The peak density is related to gas pressure, radio frequency power, and tube dimension. From B-dot measurement, there exists obvious helicon wave structure in plasma at field strength around the LFP, with component of standing wave. Theoretical analysis demonstrated that the first density peak occurs on the demarcation line in density-magnetic field map where the H-wave limited by radial boundary condition begins to propagate, while the second peak is due to the fact that the axial wavenumber of H-wave decreases gradually with the increased magnetic field and the heating effect by standing wave resonance coupling is weakened above a critical magnetic field, leading to a sudden decrease in plasma density. Simulation by HELIC code shows that the change of radial distribution of power deposition reflects the conversion of heating mechanism from single TG-wave mode to H-TG wave coupled mode heating in low magnetic fields. The axial wavenumber with the maximum absorbed power decreases with the increased magnetic field, corresponding to the change of wave structure.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141883810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Refractive channeling of heating wave driven by laser beam interaction with plasma of subcritical density 激光束与亚临界密度等离子体相互作用产生的加热波折射通道

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-01 DOI: 10.1063/5.0194806

S. Yu. Gus'kov, P. A. Kuchugov, N. N. Demchenko

引用次数: 0

Electron density control by fluorides for dielectric property modulation in gaseous discharge plasmas 利用氟化物控制电子密度以调节气态放电等离子体的介电特性

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-01 DOI: 10.1063/5.0215387

Xin Ai, Qiuyue Nie, Zhonglin Zhang, Shu Lin, Peiqi Chen, Changshi Yan, Chuanping Yu, Zhenghang Fei, Xingyu Zhao

引用次数: 0

Interaction between atmospheric pressure plasma jet and target 大气压等离子体射流与目标之间的相互作用

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-01 DOI: 10.1063/5.0205130

Gaosheng He, Yuqing Liu, Feng He, Jinsong Miao, Jingran Li, Yu Zhang, Zhiliang Gao, Ruojue Wang, Xu Yan, Jiting Ouyang

{"title":"Interaction between atmospheric pressure plasma jet and target","authors":"Gaosheng He, Yuqing Liu, Feng He, Jinsong Miao, Jingran Li, Yu Zhang, Zhiliang Gao, Ruojue Wang, Xu Yan, Jiting Ouyang","doi":"10.1063/5.0205130","DOIUrl":"https://doi.org/10.1063/5.0205130","url":null,"abstract":"Interactions of floating potential on metal and dielectric targets with He atmospheric pressure plasma jet (APPJ) were studied in this paper. The APPJ is generated in a needle-ring corona-dielectric barrier discharge configuration, driven by a sinusoidal voltage. The characteristics of APPJ were assessed through electrical and optical examinations, and the time-average electrostatic voltage on the targets was measured using both contact and non-contact electrostatic voltmeters. It was found that both metal and dielectric targets can promote the jet development and speed up the jet velocity. During the negative half-cycle, the “plasma cluster” propagates from the target toward the ground electrode and then “merges” with the forward plasma jet, leading to a reversed development of jet. The two targets follow a similar pattern on the surface electrostatic voltage, that is, initially in a positive polarity whose amplitude first increases and then decreases and transits to negative polarity with an increase in the applied voltage. But there are also some minor differences between the two targets, e.g., the metallic target can change the discharge pattern and reduces the discharge current under certain conditions.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141883863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of the possibility of generation of runaway electrons in subnanosecond gas discharges of high and ultrahigh pressure in the vicinity of microprotrusions on the cathode surface 研究在阴极表面微突起附近的亚纳秒高压和超高压气体放电中产生失控电子的可能性

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-01 DOI: 10.1063/5.0217390

Stepan N. Ivanov, Vasily V. Lisenkov

{"title":"Investigation of the possibility of generation of runaway electrons in subnanosecond gas discharges of high and ultrahigh pressure in the vicinity of microprotrusions on the cathode surface","authors":"Stepan N. Ivanov, Vasily V. Lisenkov","doi":"10.1063/5.0217390","DOIUrl":"https://doi.org/10.1063/5.0217390","url":null,"abstract":"In the pressure range of 1–40 atm, experimental and theoretical studies of the processes of initiation and development dynamics of the initial stage of the self-sustained subnanosecond discharge in nitrogen, developing in a uniform electric field with the participation of runaway electrons, were carried out. Data on the maximum achievable values of the electric field strength in the discharge gap at the pre-breakdown stage of the discharge development and photographs of the microrelief of the surface of a stainless steel cathode formed during its training by subnanosecond high-voltage pulses were obtained. These data served as the basis for numerical 3D modeling of the development of an electron avalanche initiated by a field emission electron in a small region of enhanced electric field near a microinhomogeneity on the cathode. The possibility of transition of electrons in these avalanches to the runaway regime was studied. Cone-shaped microprotrusions, metal drops, and boundaries between pores and microcraters were considered as microinhomogeneities. It has been shown that the initial energy obtained by an electron near the microinhomogeneity can significantly facilitate its transfer into the runaway regime. This effect is especially noticeable at gas pressures higher 10 atm. As a result, at the stage of a self-sustained subnanosecond discharge formation, the runaway mode of an electron can be realized at the average reduced electric field strengths in the discharge gap, which are significantly lower than required by the runaway criterion.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141883806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0