Contributions to Plasma Physics最新文献_第2页

The Influence of Non-Extensive Electrons on the Characteristics of the Space-Charge Sheath in Tonks-Langmuir Kinetic Model 非扩展电子对Tonks-Langmuir动力学模型中空间-电荷鞘特性的影响

IF 1.5 4区物理与天体物理

Contributions to Plasma Physics Pub Date : 2026-03-11 Epub Date: 2025-08-06 DOI: 10.1002/ctpp.70047

Farinaz Donyapasand Kojabad, Abdolrasoul Esfandyari Kalejahi, Mohammad Ali Mohammadi Dorbash

{"title":"The Influence of Non-Extensive Electrons on the Characteristics of the Space-Charge Sheath in Tonks-Langmuir Kinetic Model","authors":"Farinaz Donyapasand Kojabad, Abdolrasoul Esfandyari Kalejahi, Mohammad Ali Mohammadi Dorbash","doi":"10.1002/ctpp.70047","DOIUrl":"https://doi.org/10.1002/ctpp.70047","url":null,"abstract":"<div>\u0000 \u0000 The purpose of this paper is to investigate the Tonks-Langmuir model by assuming that the electrons obey the q- non-extensive distribution. The plasma equation is analytically solved. It is revealed that the quasi-neutrality length of the glow discharge exceeds with the decrement of the non-extensive parameter q. In the extensive limiting case (<math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>q</mi>\u0000 <mo>→</mo>\u0000 <mn>1</mn>\u0000 </mrow>\u0000 <annotation>$$ qto 1 $$</annotation>\u0000 </semantics></math> i.e., Maxwellian case) the previously well-known results are recovered. Moreover, by evaluating the mean inverse kinetic energy of ions, it is illustrated that the kinetic Bohm criterion does not represent an inherent property of the collision- and ionization-free one-dimensional space-charge sheaths in the case of non-extensive electron distribution, contrary to the Maxwellian one. Finally, the plasma-sheath equation is numerically solved in the case of non-extensive electron distribution. It is found that the decrement of q gives rise to the increment of the wall potential value and sheath thickness for super-thermal electron distribution q < 1. On the other hand, it is observed that the wall potential value and the sheath thickness decrease as q increases for sub-thermal electron distribution q > 1. On this basis, it is concluded that the characteristics of the space-charge sheath in the low-pressure plane symmetric discharge depend on the electron non-extensive parameter q. This is in agreement with the prior practical measurements on the ion sheath formed around a non-extensive single electric probe in plasma.\u0000 </div>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"66 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147563569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Numerical Study on the DBD Discharge Characteristics of Soil Particles in CO2 Atmosphere CO2大气中土壤颗粒DBD排放特性的数值研究

IF 1.5 4区物理与天体物理

Contributions to Plasma Physics Pub Date : 2026-03-11 Epub Date: 2025-09-24 DOI: 10.1002/ctpp.70051

Dan Li, Junyu Wang, Huayuan Liu, Juhui Chen, Baowei Sun, Xianli Liu, Michael Zhurakov, Siarhei Lapatsin, Wenrui Jiang

{"title":"Numerical Study on the DBD Discharge Characteristics of Soil Particles in CO2 Atmosphere","authors":"Dan Li, Junyu Wang, Huayuan Liu, Juhui Chen, Baowei Sun, Xianli Liu, Michael Zhurakov, Siarhei Lapatsin, Wenrui Jiang","doi":"10.1002/ctpp.70051","DOIUrl":"https://doi.org/10.1002/ctpp.70051","url":null,"abstract":"<div>\u0000 \u0000 To better understand the discharge mechanism and pollutant degradation process of dielectric barrier discharge (DBD) in soil under a CO2 atmosphere, a mathematical model and theoretical framework have been established. Based on a discharge kinetics model, this study simulates the discharge characteristics of a DBD soil system, and the simulation results show strong agreement with experimental data. The results reveal that regions of high electron density on the surfaces of soil particles induce more micro-discharges, thereby enhancing discharge efficiency. Significant changes in electron temperature on particle surfaces promote the generation of reactive species, which accelerate pollutant degradation. The electric field evolves from an initially uniform weak field to a localized strong field, which improves CO2 ionization. A higher dielectric constant of soil particles improves electric field uniformity and expands the effective discharge area. At a peak voltage of 24 kV, electron density reaches an optimal level, while excessively high or low voltages lead to reduced performance. After CO2 plasma enters the soil, long-lived reactive species such as O3, O, CO2(e1), and CO2(v1) play key roles in pollutant degradation.\u0000 </div>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"66 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147569005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Study on the Effects of Magnetic Null Point Position on Discharge Structure and Performance in a Double-Stage Hall Thruster 磁零点位置对双级霍尔推力器放电结构和性能影响的研究

IF 1.5 4区物理与天体物理

Contributions to Plasma Physics Pub Date : 2026-03-11 Epub Date: 2025-09-19 DOI: 10.1002/ctpp.70054

Long Chen, Xintong Liu, Miao Liu, Ping Duan, Weifu Gao, Xuesong Xu, Wanxin Cui, Jie Feng

{"title":"Study on the Effects of Magnetic Null Point Position on Discharge Structure and Performance in a Double-Stage Hall Thruster","authors":"Long Chen, Xintong Liu, Miao Liu, Ping Duan, Weifu Gao, Xuesong Xu, Wanxin Cui, Jie Feng","doi":"10.1002/ctpp.70054","DOIUrl":"https://doi.org/10.1002/ctpp.70054","url":null,"abstract":"<div>\u0000 \u0000 The magnetic configuration critically influences the plasma structure and discharge performance of Hall thrusters. However, the effect of magnetic null points on the performance of double-stage Hall thrusters has not been systematically investigated. In this study, we numerically examine how the spatial location of the second magnetic null point near the channel exit affects plasma behavior and propulsion performance, both in the axial and radial directions. A 2D-3V PIC/MCC model is developed to simulate the discharge process under different magnetic configurations. The results show that magnetic null point location significantly influences magnetic topology, potential distribution, and the spatial coupling between the ionization and acceleration regions. Optimal thrust and efficiency are achieved when the magnetic null point is axially aligned with the intermediate electrode and radially positioned near the channel wall, forming asymmetric magnetic fields that promote electron energization and localized ionization. In contrast, a centrally located magnetic null point increases magnetic resistance near the walls, disrupts the dual-region structure, and causes inefficient energy deposition of the electrons. These findings provide new physical insight into magnetic topology control and offer guidance for optimizing field configurations in future double-stage Hall thruster designs to improve energy utilization and propulsion efficiency.\u0000 </div>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"66 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147567484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Low-Temperature Plasma Inhibits Melanoma Growth via Enhanced T-Cell Immunity 低温血浆通过增强t细胞免疫抑制黑色素瘤生长

IF 1.5 4区物理与天体物理

Contributions to Plasma Physics Pub Date : 2026-03-11 Epub Date: 2025-07-31 DOI: 10.1002/ctpp.70046

Na Liu, Xiangni Wang, Xiying Wang, Jinren Liu, Yixin Cui, Guimin Xu, Jiajia Lu, Chuchu Kang, Zhirou He, Yulin Xu, Rongrong Li, Xingmin Shi, Xili Wu, Peng An

{"title":"Low-Temperature Plasma Inhibits Melanoma Growth via Enhanced T-Cell Immunity","authors":"Na Liu, Xiangni Wang, Xiying Wang, Jinren Liu, Yixin Cui, Guimin Xu, Jiajia Lu, Chuchu Kang, Zhirou He, Yulin Xu, Rongrong Li, Xingmin Shi, Xili Wu, Peng An","doi":"10.1002/ctpp.70046","DOIUrl":"https://doi.org/10.1002/ctpp.70046","url":null,"abstract":"<div>\u0000 \u0000 Since the antitumor effect of low-temperature plasma (LTP) was first discovered in 2007, efforts have been devoted to investigating its therapeutic effects in various tumors. LTP has been shown to induce diverse cell death pathways in a dose-dependent manner, modulate immunogenic responses, and suppress tumor invasion and metastasis. However, the precise mechanisms underlying these effects remain poorly elucidated. In this study, we investigated the role of LTP in melanoma growth inhibition. Our findings demonstrate that LTP suppresses melanoma progression by enhancing T-cell-mediated immunity. Mechanistic investigations suggest that direct LTP treatment modulates cytokine expression in regulatory T cells (Tregs) and CD8+ T cells, while indirect LTP treatment regulates cytokine levels and inhibits the signal transducer and activator of transcription 3 (STAT3) signaling pathway, contributing to its antitumor activity. These results not only provide a potential novel strategy for melanoma treatment but also advance our understanding of the interplay between LTP and the immune system.\u0000 </div>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"66 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147570373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Cover Picture: Contrib. Plasma Phys. 02/2026 封面图片：投稿。等离子体物理学报2/2026

IF 1.5 4区物理与天体物理

Contributions to Plasma Physics Pub Date : 2026-03-11 DOI: 10.1002/ctpp.70088

引用次数: 0

Issue Information: Contrib. Plasma Phys. 02/2026 发行信息：投稿。等离子体物理学报2/2026

IF 1.5 4区物理与天体物理

Contributions to Plasma Physics Pub Date : 2026-03-11 DOI: 10.1002/ctpp.70087

引用次数: 0

Dynamics of Ion-Acoustic Solitary Waves in Relativistic Magnetorotating Plasmas in the Presence of Degenerate Electrons and Positrons 简并电子和正电子存在下相对论磁旋等离子体中离子声孤波的动力学

IF 1.5 4区物理与天体物理

Contributions to Plasma Physics Pub Date : 2026-03-11 Epub Date: 2025-09-22 DOI: 10.1002/ctpp.70052

Satyendra Nath Barman, Muktarul Rahman

{"title":"Dynamics of Ion-Acoustic Solitary Waves in Relativistic Magnetorotating Plasmas in the Presence of Degenerate Electrons and Positrons","authors":"Satyendra Nath Barman, Muktarul Rahman","doi":"10.1002/ctpp.70052","DOIUrl":"https://doi.org/10.1002/ctpp.70052","url":null,"abstract":"<div>\u0000 \u0000 This study examines the nonlinear features of solitary ion-acoustic (IA) waves propagating in a three dimensional magnetorotating plasma composed of warm inertial ions along with degenerate electrons and positrons. Where the ions are taken to be adiabatic and relativistic, and electrons and positrons are supposed to obey the degenerate Thomas-Fermi density distribution. The reductive perturbation approach is employed to derive a generalized Zakharov-Kuznetsov (ZK) equation that characterizes the evolution of nonlinear IA solitary waves. The stationary solution of ZK equation and a Sagdeev potential has been formulated to analyze the variations in the oblique propagation of IA solitary waves. Numerical analysis reveals that the soliton structures are highly sensitive to relevant plasma parameters, including ion temperature, relativistic ion streaming speed, positron concentration, obliqueness angle, magnetic field strength, and rotation frequency. It is found that an increase in ion temperature (or positron concentration) generally reduces the soliton amplitude and broadens (narrows) its width, while stronger relativistic streaming enhances the soliton amplitude and compresses its width. Additionally, the soliton width exhibits a strong dependence on both the external magnetic field and plasma rotation, highlighting the dispersive role of Coriolis force and magnetization effects. Furthermore, comparison between non-relativistic and ultra-relativistic electron/positron degeneracy cases indicates that ultra-relativistic effects support stronger phase velocities and broader solitary structures. These findings may contribute to a comprehensive understanding of soliton propagation in rotating plasmas relevant to both astrophysical phenomena and laboratory settings, where degenerate electrons and positrons coexist under the influence of strong magnetic fields.\u0000 </div>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"66 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147568371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Impact of Internal Cathode Position on Permanent Magnet Hall Thruster Performance 内阴极位置对永磁霍尔推力器性能的影响

IF 1.5 4区物理与天体物理

Contributions to Plasma Physics Pub Date : 2026-03-11 Epub Date: 2025-10-08 DOI: 10.1002/ctpp.70055

Yi Li, Jia Liu, Yan Zhang, Zijie Li, Rui Ding, Yong Wang, Hong Li, Liqiu Wei, Yongjie Ding

引用次数: 0

Independent Control of Electron Temperature and Density in Copper Thermionic Vacuum Arc Plasmas 铜热离子真空电弧等离子体中电子温度和密度的独立控制

IF 1.5 4区物理与天体物理

Contributions to Plasma Physics Pub Date : 2026-03-11 Epub Date: 2025-08-12 DOI: 10.1002/ctpp.70045

Tamer Akan, Çağrı Durmuş

{"title":"Independent Control of Electron Temperature and Density in Copper Thermionic Vacuum Arc Plasmas","authors":"Tamer Akan, Çağrı Durmuş","doi":"10.1002/ctpp.70045","DOIUrl":"https://doi.org/10.1002/ctpp.70045","url":null,"abstract":"<div>\u0000 \u0000 The thermionic vacuum arc (TVA) is a plasma source that generates highly ionized metal vapor plasmas via anodic evaporation, with independent control over plasma parameters through operational adjustments. This study investigates copper (Cu) plasmas produced by a TVA system under stable-state conditions, focusing on the dependencies of electron temperature (Te) and electron number density (Ne) on operating parameters such as arc current (Iarc) and cathode filament current (If). Optical emission spectroscopy (OES) in the 200–1000 nm range was employed to analyze spectral line intensities of neutral Cu atoms. Te was determined via the Boltzmann plot method, yielding values between 4720 ± 250 K and 5370 ± 300 K as the Iarc increased from 300 to 1200 mA (at a fixed If of 18.5 A), while increasing the If from 16 to 19 A elevated Te from 4580 ± 250 K to 5180 ± 300 K, demonstrating distinct contributions of both parameters to electron heating. Ne was determined using Stark broadening analysis, revealing a weak dependence on operating parameters, with values ranging from (5.0 ± 0.8) × 1016 cm−3 to (8.9 ± 0.9) × 1016 cm−3). These findings highlight the TVA's unique capability to controllably tailor plasma properties, making it a promising candidate for advanced coating processes requiring precise plasma parameter modulation.\u0000 </div>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"66 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147564969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Applying Machine Learning Methods to Laser Acceleration of Protons: Synthetic Data for Exploring the High Repetition Rate Regime 将机器学习方法应用于质子的激光加速：探索高重复率体系的合成数据

IF 1.5 4区物理与天体物理

Contributions to Plasma Physics Pub Date : 2026-03-11 Epub Date: 2025-10-29 DOI: 10.1002/ctpp.70049

John J. Felice, Ronak Desai, Nathaniel Tamminga, Joseph R. Smith, Alona Kryshchenko, Chris Orban, Michael L. Dexter, Anil K. Patnaik

{"title":"Applying Machine Learning Methods to Laser Acceleration of Protons: Synthetic Data for Exploring the High Repetition Rate Regime","authors":"John J. Felice, Ronak Desai, Nathaniel Tamminga, Joseph R. Smith, Alona Kryshchenko, Chris Orban, Michael L. Dexter, Anil K. Patnaik","doi":"10.1002/ctpp.70049","DOIUrl":"https://doi.org/10.1002/ctpp.70049","url":null,"abstract":"Advances in ultra-intense laser technology have increased repetition rates and average power for chirped-pulse laser systems, which offer a promising solution for many applications including energetic proton sources. An important challenge is the need to optimize and control the proton source by varying some of the many degrees of freedom inherent to the laser-plasma interactions. Machine learning can play an important role in this task, as our work examines. Building on our earlier work in Desai et al. 2024, we generate a large ∼1.5 million data point synthetic data set for proton acceleration using a physics-informed analytic model that we improved to include pre-pulse physics. Then, we train different machine learning methods on this data set to determine which methods perform efficiently and accurately. Generally, we find that quasi-real-time training of neural network models using single-shot data from a kHz repetition rate ultra-intense laser system should typically be feasible on a single GPU. We also find that a less sophisticated model, like a polynomial regression, can be trained even faster and that the accuracy of these models is still good enough to be useful. We provide our source code and example synthetic data for others to test new machine learning methods and approaches to automated learning in this regime.","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"66 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ctpp.70049","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147570136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0