Physics of Plasmas最新文献_第8页

Ejecta from double-shock loaded tin target by hohlraum radiation and plasma jet 通过霍尔姆辐射和等离子体射流从双冲击装载锡靶喷出的抛射体

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-13 DOI: 10.1063/5.0173963

Yaoxiang Song, Genbai Chu, Minghai Yu, Yuchi Wu, Wei Fan, Tao Xi, Min Shui, Chao Tian, Lianqiang Shan, Feng Zhang, Weimin Zhou, Yuqiu Gu

{"title":"Ejecta from double-shock loaded tin target by hohlraum radiation and plasma jet","authors":"Yaoxiang Song, Genbai Chu, Minghai Yu, Yuchi Wu, Wei Fan, Tao Xi, Min Shui, Chao Tian, Lianqiang Shan, Feng Zhang, Weimin Zhou, Yuqiu Gu","doi":"10.1063/5.0173963","DOIUrl":"https://doi.org/10.1063/5.0173963","url":null,"abstract":"The phenomenon of mass ejection from shocked surface is a crucial issue in high-energy density physics and shock compression science. Ejecta from double-shock loaded metallic targets is important in some practical applications, but there are only a few research types on this aspect due to experimental difficulty. We proposed a new method of double-shock loading based on intense laser, that is, the laser is injected into a vacuum hohlraum to generate strong radiation and plasma jet simultaneously, and the target are respectively subjected to two shocks by these two different mechanisms. In the experiment, double-shock process was clearly observed by photonic Doppler velocimetry system, and the recompression of target due to the second shock was presented by x-ray photography. After the free surface was broken, the ejecta showed a unique multi-layer density structure for the first time. This work achieves effective double-shock loading with only one single laser pulse, which is valuable for understanding the metal damage under multiple shocks and the evolution of ejected materials. It also provides an experimental design for studying the material response in complex environments.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":"8 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221929","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

The high dust density regime of dusty plasma: Theory and simulations 尘埃等离子体的高尘埃密度体系：理论与模拟

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-12 DOI: 10.1063/5.0211037

K. Avinash, S. J. Kalita, R. Ganesh, P. Kaur

{"title":"The high dust density regime of dusty plasma: Theory and simulations","authors":"K. Avinash, S. J. Kalita, R. Ganesh, P. Kaur","doi":"10.1063/5.0211037","DOIUrl":"https://doi.org/10.1063/5.0211037","url":null,"abstract":"It is shown that the dust density regimes in the dusty plasma are characterized by two complementary screening processes: (i) the low dust density regime where the Debye screening is the dominant process and (ii) the high dust density regime where the “Coulomb screening” is the dominant process. The Debye regime is characterized by a state where all dust particles carry an equal and constant charge. The high dust density regime or the “Coulomb plasma” regime is characterized by (a) “Coulomb screening” where the dust charge depends on the spatial location and is screened by other dust particles in the vicinity by charge reduction, (b) “asymptotic freedom” where dust particles, which on an average carry minimal electric charge, are asymptotically free in the high dust density limit, (c) uniform dust charge density and plasma potential, (d) dust charge neutralization by a uniform background of hot ions, and (e) dust is weakly coupled due to strong Coulomb screening. Thus, the dusty plasma is essentially a weakly coupled, one-component plasma with screening in the high dust density limit. Molecular dynamics (MD) simulations verify these properties. The MD simulations are performed, using a recently proposed Hamiltonian formalism to study the dynamics of Yukawa particles carrying variable electric charge. A hydrodynamic model for describing the collective properties of Coulomb plasma and its characteristic acoustic mode called the “Coulomb acoustic mode” arising due to imperfect Coulomb screening is given.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":"29 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221932","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

Inactivation of microorganisms in model tissues by plasma-activated gas 等离子激活气体灭活模型组织中的微生物

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-09 DOI: 10.1063/5.0220070

Sihong Ma, Pengyu Zhao, Rui Zhang, Kaiyu Li, Tianyi Song, Zizhu Zhang, Luge Wang, Li Guo, Zifeng Wang, Hao Zhang, Dingxin Liu, Xiaohua Wang, Mingzhe Rong

{"title":"Inactivation of microorganisms in model tissues by plasma-activated gas","authors":"Sihong Ma, Pengyu Zhao, Rui Zhang, Kaiyu Li, Tianyi Song, Zizhu Zhang, Luge Wang, Li Guo, Zifeng Wang, Hao Zhang, Dingxin Liu, Xiaohua Wang, Mingzhe Rong","doi":"10.1063/5.0220070","DOIUrl":"https://doi.org/10.1063/5.0220070","url":null,"abstract":"Plasma is highly efficient in the inactivation of microorganisms and is tried to be applied to the treatment of wounds. The gas activated by plasma, named plasma-activated gas, can also effectively inactivate microorganisms and get rid of the limitations of direct plasma treatment. However, the details of the interaction of plasma-activated gas on the tissue are still unclear. In this study, the agarose gel models in the presence of microorganisms to simulate the infected tissues were used to study the inactivation effects and mechanisms of plasma-activated gas. The inactivation depths in the gel models in the presence of microorganisms were related to the types of plasma-activated gas and the species of microorganisms. The Mixed-gas exhibited the strongest inactivation effects, and the inactivation depths in the gel models in the presence of bacteria were deeper than those in the presence of fungi. The long-lived species in the plasma-activated gas penetrated to more than 5.2 mm while the short-lived species only penetrated less than 2.3 mm, demonstrating the distinct roles of reactive species in the inactivation process. Moreover, the pig muscle was covered on the gel models to assess the penetration depths of the plasma-activated gas in muscle tissue and the focused plasma-activated gas could penetrate 1–1.5 mm of pig muscle. This study explored the inactivation effects and mechanisms on the gel models and the penetration depths in the real tissues of plasma-activated gas, which supplied the theoretical basis for the further application of plasma-activated gas in biomedical fields.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":"21 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141946327","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

Plasma-induced damage on the tungsten surface using a kilojoule plasma focus device: Applicable to study the damages on nuclear fusion reactor related materials 使用千焦耳等离子体聚焦装置对钨表面进行等离子体诱导损伤：适用于核聚变反应堆相关材料的损伤研究

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-09 DOI: 10.1063/5.0211839

Jalaj Jain, Marcos Flores Carrasco, Jose Moreno, Sergio Davis, Cristian Pavez, Biswajit Bora, Leopoldo Soto

{"title":"Plasma-induced damage on the tungsten surface using a kilojoule plasma focus device: Applicable to study the damages on nuclear fusion reactor related materials","authors":"Jalaj Jain, Marcos Flores Carrasco, Jose Moreno, Sergio Davis, Cristian Pavez, Biswajit Bora, Leopoldo Soto","doi":"10.1063/5.0211839","DOIUrl":"https://doi.org/10.1063/5.0211839","url":null,"abstract":"Damages induced on the tungsten surface at two different operating conditions of a kilojoule plasma focus device are studied. In one condition, the tungsten samples were exposed to axial plasma shocks that are formed after pinch disruption, and in the other condition, the pinch phenomenon was absent or weak. Melting, craters, and cracking on the surfaces were observed in both cases. In the former case, the charged particle beams and post-pinch material ejection will play a role in impacting the surface; however, in the latter case those phenomena will have small contributions because of the absence or weak formation of the pinch. A damage factor of ∼109 W m−2 s0.5 was estimated at a distance of 3 cm from the pinch exit using the method given in Akel et al. [J. Fusion Energy 35, 694–701 (2016)] and Klimov et al. [J. Nucl. Mater. 390, 721–726 (2009)] for the former case. The present work suggests that at pressures lower than the pinch-occurring pressure, only axial plasma shock effects on the targeted surface can be studied and that they can be separated from the effects produced by the charged particle beams mixed with axial plasma shocks in the case of pinch occurrence.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":"14 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141946388","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

X-ray imaging and electron temperature evolution in laser-driven magnetic reconnection experiments at the national ignition facility 国家点火装置激光驱动磁重联实验中的 X 射线成像和电子温度演变

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-09 DOI: 10.1063/5.0213598

Vicente Valenzuela-Villaseca, Jacob M. Molina, Derek B. Schaeffer, Sophia Malko, Jesse Griff-McMahon, Kirill Lezhnin, Michael J. Rosenberg, S. X. Hu, Dan Kalantar, Clement Trosseille, Hye-Sook Park, Bruce A. Remington, Gennady Fiksel, Dmitri Uzdensky, Amitava Bhattacharjee, William Fox

{"title":"X-ray imaging and electron temperature evolution in laser-driven magnetic reconnection experiments at the national ignition facility","authors":"Vicente Valenzuela-Villaseca, Jacob M. Molina, Derek B. Schaeffer, Sophia Malko, Jesse Griff-McMahon, Kirill Lezhnin, Michael J. Rosenberg, S. X. Hu, Dan Kalantar, Clement Trosseille, Hye-Sook Park, Bruce A. Remington, Gennady Fiksel, Dmitri Uzdensky, Amitava Bhattacharjee, William Fox","doi":"10.1063/5.0213598","DOIUrl":"https://doi.org/10.1063/5.0213598","url":null,"abstract":"We present results from x-ray imaging of high-aspect-ratio magnetic reconnection experiments driven at the National Ignition Facility. Two parallel, self-magnetized, elongated laser-driven plumes are produced by tiling 40 laser beams. A magnetic reconnection layer is formed by the collision of the plumes. A gated x-ray framing pinhole camera with micro-channel plate detector produces multiple images through various filters of the formation and evolution of both the plumes and current sheet. As the diagnostic integrates plasma self-emission along the line of sight, two-dimensional electron temperature maps ⟨Te⟩Y are constructed by taking the ratio of intensity of these images obtained with different filters. The plumes have a characteristic temperature ⟨Te⟩Y=240 ± 20 eV at 2 ns after the initial laser irradiation and exhibit a slow cooling up to 4 ns. The reconnection layer forms at 3 ns with a temperature ⟨Te⟩Y=280 ± 50 eV as the result of the collision of the plumes. The error bars of the plumes and current sheet temperatures separate at 4 ns, showing the heating of the current sheet from colder inflows. Using a semi-analytical model, we survey various heating mechanisms in the current sheet. We find that reconnection energy conversion would dominate at low density (ne≲7×1018 cm−3) and electron-ion collisional drag at high-density (≳1019 cm−3).","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":"27 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141946392","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

Evolution of filament-like compact structures in small 3 kJ dense plasma focus discharges 3 kJ 小型稠密等离子体聚焦放电中丝状紧凑结构的演变

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-09 DOI: 10.1063/5.0187304

P. Kubes, L. Marciniak, M. J. Sadowski, M. Paduch, B. Cikhardtova, J. Cikhardt, J. Kravarik, J. Malir, V. Munzar, J. Novotný, K. Rezac

引用次数: 0

Erosion and impurity transport for the edge localized mode suppression window in KSTAR KSTAR 边缘局部模式抑制窗口的侵蚀和杂质传输

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-09 DOI: 10.1063/5.0213155

Marcos Navarro, Jonathan Van Blarcum, Heinke Frerichs, Juri Romazanov, Andreas Kirschner, Jong-Kyu Park, Seong-Moo Yang, Oliver Schmitz

引用次数: 0

Analytical solutions to (modified) Korteweg–de Vries–Zakharov–Kuznetsov equation and modeling ion-acoustic solitary, periodic, and breather waves in auroral magnetoplasmas 极光磁性等离子体中（修正）Korteweg-de Vries-Zakharov-Kuznetsov 方程的分析解及离子声孤波、周期波和呼吸波建模

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-09 DOI: 10.1063/5.0220798

Weaam Alhejaili, Subrata Roy, Santanu Raut, Ashim Roy, Alvaro H. Salas, Tarek Aboelenen, S. A. El-Tantawy

{"title":"Analytical solutions to (modified) Korteweg–de Vries–Zakharov–Kuznetsov equation and modeling ion-acoustic solitary, periodic, and breather waves in auroral magnetoplasmas","authors":"Weaam Alhejaili, Subrata Roy, Santanu Raut, Ashim Roy, Alvaro H. Salas, Tarek Aboelenen, S. A. El-Tantawy","doi":"10.1063/5.0220798","DOIUrl":"https://doi.org/10.1063/5.0220798","url":null,"abstract":"This article investigates the propagation of different types of nonlinear ion-acoustic waves, including periodic waves, solitons, and breathers in non-Maxwellian magnetized plasma. The plasma model consists of inertial cold ions, inertialess cold electrons that obey a Boltzmann distribution, and inertialess non-Maxwellian hot electrons that follow the generalized (r, q) distribution. The reductive perturbation technique is utilized to obtain the Korteweg–de Vries–Zakharov–Kuznetsov equation (KdV-ZK) from the fluid equations that govern plasma dynamics. Furthermore, the modified KdV-ZK equation is derived due to the limited capability of the KdV-ZK model to represent the dynamics of the nonlinear structures at specific critical values of the relevant physical variables in the investigated system. The periodic solutions to the two models (KdV-ZK and mKdV-ZK models) are derived using Jacobi elliptic functions. This approach directly links periodic waves (cnoidal waves) and soliton solutions. Hirota's bilinear method generates breathers for both models. Finally, we examine the quantitative understanding of the effects of several physical parameters replicated by the Swedish satellite Viking incorporated in the model. The findings reported in this study enhance our comprehension of the properties of the electron distribution function's high- and low-energy segments and the development of periodic, soliton, multi-soliton, and breather phenomena in space and astrophysical plasmas.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":"27 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141946329","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

Augmenting machine learning of Grad–Shafranov equilibrium reconstruction with Green's functions 用格林函数增强机器学习的 Grad-Shafranov 平衡重构

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-09 DOI: 10.1063/5.0213625

J. McClenaghan, C. Akçay, T. B. Amara, X. Sun, S. Madireddy, L. L. Lao, S. E. Kruger, O. M. Meneghini

{"title":"Augmenting machine learning of Grad–Shafranov equilibrium reconstruction with Green's functions","authors":"J. McClenaghan, C. Akçay, T. B. Amara, X. Sun, S. Madireddy, L. L. Lao, S. E. Kruger, O. M. Meneghini","doi":"10.1063/5.0213625","DOIUrl":"https://doi.org/10.1063/5.0213625","url":null,"abstract":"This work presents a method for predicting plasma equilibria in tokamak fusion experiments and reactors. The approach involves representing the plasma current as a linear combination of basis functions using principal component analysis of plasma toroidal current densities (Jt) from the EFIT-AI equilibrium database. Then utilizing EFIT's Green's function tables, basis functions are created for the poloidal flux (ψ) and diagnostics generated from the toroidal current (Jt). Similar to the idea of a physics-informed neural network (NN), this physically enforces consistency between ψ, Jt, and the synthetic diagnostics. First, the predictive capability of a least squares technique to minimize the error on the synthetic diagnostics is employed. The results show that the method achieves high accuracy in predicting ψ and moderate accuracy in predicting Jt with median R2 = 0.9993 and R2 = 0.978, respectively. A comprehensive NN using a network architecture search is also employed to predict the coefficients of the basis functions. The NN demonstrates significantly better performance compared to the least squares method with median R2 = 0.9997 and 0.9916 for Jt and ψ, respectively. The robustness of the method is evaluated by handling missing or incorrect data through the least squares filling of missing data, which shows that the NN prediction remains strong even with a reduced number of diagnostics. Additionally, the method is tested on plasmas outside of the training range showing reasonable results.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":"53 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141946387","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

Effect of the geometrical parameters of an X-pinch on the characteristics of the soft x-ray source X 射线夹的几何参数对软 X 射线源特性的影响

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-09 DOI: 10.1063/5.0214382

A. P. Artyomov, V. I. Oreshkin, A. G. Rousskikh, D. V. Rybka, A. V. Fedyunin, S. A. Chaikovsky, N. A. Ratakhin

引用次数: 0