Contributions to Plasma Physics最新文献

{"title":"Cover Picture: Contrib. Plasma Phys. 06/2025","authors":"","doi":"10.1002/ctpp.202590011","DOIUrl":"https://doi.org/10.1002/ctpp.202590011","url":null,"abstract":"<p>3D plots of ion density, temperature and polytropic coefficient for a fixed potential <i>ϕ</i> = 0.5. Fig. 10 of the paper by Majid Khan et al. https://doi.org/10.1002/ctpp.70010\u0000 \u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"65 6","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ctpp.202590011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144574156","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}

{"title":"Issue Information: Contrib. Plasma Phys. 06/2025","authors":"","doi":"10.1002/ctpp.202590012","DOIUrl":"https://doi.org/10.1002/ctpp.202590012","url":null,"abstract":"","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"65 6","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ctpp.202590012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144574157","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}

{"title":"Cover Picture: Contrib. Plasma Phys. 05/2025","authors":"","doi":"10.1002/ctpp.202590009","DOIUrl":"https://doi.org/10.1002/ctpp.202590009","url":null,"abstract":"<p>Spatial distribution of particles hitting the collector probes based on different simulations for the DIII-Dcase: (a) 40 million, (b) 80 million, (c) 160 million. Fig.18 of the paper by Dhyanjyoti D. Nath et al. https://doi.org/10.1002/ctpp.202400073\u0000 \u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"65 5","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ctpp.202590009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144315283","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}

{"title":"Issue Information: Contrib. Plasma Phys. 05/2025","authors":"","doi":"10.1002/ctpp.202590010","DOIUrl":"https://doi.org/10.1002/ctpp.202590010","url":null,"abstract":"","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"65 5","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ctpp.202590010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144315284","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}

{"title":"Effect of Separated Spin Densities of Electrons on the Propagation Characteristics of Kinetic Alfvenic Solitons","authors":"Muhammad Adnan,&nbsp;Hina Zaib,&nbsp; Ikramullah,&nbsp;Fida Younus Khattak","doi":"10.1002/ctpp.70011","DOIUrl":"https://doi.org/10.1002/ctpp.70011","url":null,"abstract":"<div>\u0000 \u0000 <p>This study investigates how spin polarization, arising from spin mismatch between electron populations, influences the propagation of kinetic Alfvén waves (KAWs) in a low-beta electron-ion plasma. By analyzing the impact of spin-polarized electron densities in distinct spin states, the research examines modifications to wave dispersion in both linear and nonlinear regimes. In the linear analysis, the study derives and examines the coupled dispersion relation for two dominant wave modes: one governed by Alfvénic dynamics and the other by acoustic interactions. The findings indicate that spin polarization increases the phase speed in the Alfvénic regime, while a larger spin mismatch significantly reduces the phase speed in the acoustic regime. Additionally, the interplay between perpendicular wave characteristics and ion gyration effects modifies wave dispersion, particularly for shorter wavelengths. The study also highlights the role of wave propagation direction in shaping frequency characteristics. In the nonlinear regime, the evolution of KAWs is analyzed using the Reductive Perturbation Technique, leading to a mathematical framework that describes solitary wave structures. The results show that spin polarization suppresses the amplitude and narrows the width of these solitons, while higher electron degeneracy counteracts these effects, contributing to their stabilization. Furthermore, wave obliqueness and the Mach number play a significant role in determining the spatial characteristics and energy distribution of the solitons. These insights provide a deeper understanding of KAW behavior in spin-polarized plasmas, which is relevant to space and astrophysical environments where such conditions prevail.</p>\u0000 </div>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"65 6","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144573977","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}

{"title":"Effect of the Gas Pressure, Charging Voltage, and Anode Length on the Neon Soft X-Ray Emission From Plasma Foci—Measurements and Simulation","authors":"R. Albahri,&nbsp;Y. Abou-Ali,&nbsp;M. Akel","doi":"10.1002/ctpp.70003","DOIUrl":"https://doi.org/10.1002/ctpp.70003","url":null,"abstract":"<div>\u0000 \u0000 <p>Using the Lee model code, numerical experiments were performed to compute the soft x-ray (SXR) yield as a function of the initial neon pressure for seven different energy plasma focus devices (NX2, INTI, UNU/ICTP, APF, NX1, PF7, PF24). In addition, the effect of operation voltage for four plasma focus devices (APF, NX2, UNU/ICTP, NX1) and the anode length for two plasma focus devices (NX1, NX2) on the soft x-ray yield (<i>Y</i>_sxr) versus pressure was studied and discussed. At experimental pressure, the computed current waveform was well fitted to the measured total current waveform for each device. Furthermore, the maximum discharge current, pinch current, axial and radial velocities, average pinch temperatures and densities, and pinch dimensions around the optimum pressure for the maximum <i>Y</i>_sxr were computed for the seven mentioned devices. The computed values obtained are within the temperature window required to generate H-like (1022 eV) and He-like (922 eV) plasmas. The computed <i>Y</i>_sxr are in good agreement with part of the experimental results. Moreover, experimental and computed values of the end axial speed (<i>v</i>_a), final inward shock speed (<i>v</i>_s), the speed factor (<i>SF</i>) and the current per cm of anode radius (<i>ID</i>) were compared for part of the considered devices.</p>\u0000 </div>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"65 5","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144315348","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}

{"title":"Propagation Phenomena of Ion-Acoustic Solitary Waves With External Periodic Force in e-p-i Plasmas: Two Negative Ion Plasmas","authors":"Muhammad Shahnewaz Bhuyan,&nbsp;Umma Imon,&nbsp;Mohammad Shah Alam","doi":"10.1002/ctpp.70006","DOIUrl":"https://doi.org/10.1002/ctpp.70006","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;With a view to understanding some nonlinear properties of the ion-acoustic solitary waves (IASWs) like phase velocity, nonlinearity, amplitude and production of solitons in the &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;A&lt;/mi&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;r&lt;/mi&gt;\u0000 &lt;mo&gt;+&lt;/mo&gt;\u0000 &lt;/msup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ mathrm{A}{mathrm{r}}^{+} $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;F&lt;/mi&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;/msup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ {mathrm{F}}^{-} $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, and &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msubsup&gt;\u0000 &lt;mi&gt;SF&lt;/mi&gt;\u0000 &lt;mn&gt;5&lt;/mn&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;/msubsup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ {mathrm{SF}}_5^{-} $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; species plasma (referred to as &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;A&lt;/mi&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;r&lt;/mi&gt;\u0000 &lt;mo&gt;+&lt;/mo&gt;\u0000 &lt;/msup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ mathrm{A}{mathrm{r}}^{+} $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; plasma) as well as &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msubsup&gt;\u0000 &lt;mi&gt;SF&lt;/mi&gt;\u0000 &lt;mn&gt;5&lt;/mn&gt;\u0000 &lt;mo&gt;+&lt;/mo&gt;\u0000 &lt;/msubsup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ {mathrm{SF}}_5^{+} $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;F&lt;/mi&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;/msup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ {mathrm{F}}^{-} $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, and &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msubsup&gt;\u0000 &lt;mi&gt;SF&lt;/mi&gt;\u0000 &lt;mn&gt;5&lt;/mn&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;/msubsup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ {mathrm{SF}}_5^{-} $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; species plasma (referred to as &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msubsup&gt;\u0000 &lt;mi&gt;SF&lt;/mi&gt;\u0000 &lt;mn&gt;5&lt;/mn&gt;\u0000 &lt;mo&gt;+&lt;/mo&gt;\u0000 &lt;/msubsup&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ {mathrm{SF}}_5^{+} $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; plasma) including nonthermal electrons and positrons under the influence o","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"65 6","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144573201","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}

{"title":"Cover Picture: Contrib. Plasma Phys. 04/2025","authors":"","doi":"10.1002/ctpp.202590007","DOIUrl":"https://doi.org/10.1002/ctpp.202590007","url":null,"abstract":"<p>Simulated trajectories of electrons bombarding the mask line, as well as incoming electrons from the surface above at different temperatures in the front view. The number of incident electrons in each panel is 25. The red dash indicates the profile of the mask line. Fig. 2 of the paper by Peng Zhang et al. https://doi.org/10.1002/ctpp.202400118\u0000 \u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"65 4","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ctpp.202590007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871618","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}

{"title":"Issue Information: Contrib. Plasma Phys. 04/2025","authors":"","doi":"10.1002/ctpp.202590008","DOIUrl":"https://doi.org/10.1002/ctpp.202590008","url":null,"abstract":"","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"65 4","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ctpp.202590008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871546","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}

{"title":"Ion Polytropic Coefficient in Bounded Plasmas With Cairns–Tsallis Distributed Electrons","authors":"Majid Khan,&nbsp;Sobia Shabbir,&nbsp;M. Kamran","doi":"10.1002/ctpp.70010","DOIUrl":"https://doi.org/10.1002/ctpp.70010","url":null,"abstract":"<div>\u0000 \u0000 <p>The Cairns–Tsallis (CT) distribution function is employed to model the quasi-neutral region of a basic bounded-plasma system, such as the one described by Tonks and Langmuir (TL). Electrons are assumed to follow the CT distribution, while ions are generated through electron-impact ionization of cold neutral atoms. Under the plasma approximation, the ion velocity distribution function is derived, and fluid moments are taken to evaluate the ion density, temperature, and polytropic coefficient. The results indicate that the ion polytropic coefficient is strongly dependent on the electron nonextensivity (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>q</mi>\u0000 </mrow>\u0000 <annotation>$$ q $$</annotation>\u0000 </semantics></math>) and nonthermality (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>α</mi>\u0000 </mrow>\u0000 <annotation>$$ alpha $$</annotation>\u0000 </semantics></math>) parameters inherent to the CT distribution. Specifically, an increase in electron nonextensivity leads to a significant deviation in the polytropic index, emphasizing the role of nonthermal effects in plasma behavior. These findings reduce to the Maxwellian case under specific limits, thus, validating the model. The study highlights the relevance of the CT distribution in capturing a broader range of physical phenomena in bounded plasmas, potentially applicable to space and astrophysical plasma environments.</p>\u0000 </div>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"65 6","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144574303","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}