Contributions to Plasma Physics最新文献

{"title":"Ion acceleration from golden mylar film irradiated by visible ns pulsed laser","authors":"L. Torrisi,&nbsp;L. Silipigni,&nbsp;M. Cutroneo,&nbsp;A. Torrisi","doi":"10.1002/ctpp.202300166","DOIUrl":"10.1002/ctpp.202300166","url":null,"abstract":"<p>A Pulsed <i>ns</i> laser operating at 532 nm wavelength with 150 mJ pulse energy was employed to irradiate micrometric thick mylar films, from 1 to 100 μm thick, covered by 0.05 μm Au in the back face. Protons and light ions have been accelerated by the electric field developed in the non-equilibrium plasma by the laser pulse in a vacuum at an intensity of the order of 10¹⁰ W/cm². Time-of-flight technique, obtained using a Faraday cup and a fast storage oscilloscope, is employed to measure the ion velocity, energy, and yield emitted in backward and forward directions. The yield of the emitted plasma photons is also evaluated. Two ion collectors are used in opposite directions to measure the plasma radiations emitted in backward and forward directions. Data analysis is based on the Coulomb-Boltzmann-shifted (CBS) distribution function. The target ablation yield is evaluated in the order of 3.5 μm per laser shot.</p>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"64 9","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140074302","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":"Influence of temperature and pressure gradient on power deposition and field pattern in High Magnetic field Helicon eXperiment","authors":"Y. Zhou,&nbsp;T. Y. Huang,&nbsp;X. M. Wu","doi":"10.1002/ctpp.202300124","DOIUrl":"10.1002/ctpp.202300124","url":null,"abstract":"<p>Based on High Magnetic field Helicon eXperiment, considering the parabolic distribution and Gaussian distribution of radial plasma density, HELIC code was used to study the influence of temperature and pressure gradient on power deposition, electric field, and current density of Helicon Wave Plasma. Three different gradients (positive, negative, and zero gradient) were selected. The results show that positive temperature gradient is beneficial to increase the relative absorption power at the center of plasma. Compared with negative and zero pressure gradients, positive pressure gradient increases the relative absorption power and weakens the current density at the center of plasma, and increases the electric field intensity at the edge of plasma. Larger edge heating will cause the relative absorption power at edge to rise rapidly, which is not conducive to the coupling at the center of plasma. In practical experiments, it is particularly important to reduce the heating effect at edge by cooling the antenna itself. Three different gradients of temperature and pressure have little effect on electric field intensity and current density in plasma, and the variation trend is basically similar, which proves the stability of the antenna mode: m = 1.</p>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"64 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140001927","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":"Self-consistent transport simulation of boron dust particle injection in the peripheral plasma in Large Helical Device","authors":"M. Shoji,&nbsp;G. Kawamura,&nbsp;R. Smirnov,&nbsp;Y. Tanaka,&nbsp;S. Masuzaki,&nbsp;F. Nespoli,&nbsp;E. Gilson,&nbsp;R. Lunsford","doi":"10.1002/ctpp.202300105","DOIUrl":"10.1002/ctpp.202300105","url":null,"abstract":"<p>The trajectories and the ablation positions of boron dust particles dropped from an impurity powder dropper in the peripheral plasma in the Large Helical Device (LHD) were calculated using a three-dimensional edge plasma simulation code (EMC3-EIRENE) and a dust transport simulation code (DUSTT). The simulation shows that the trajectory of the boron dust particles is deflected at the upper divertor leg due to the effect of the hydrogen plasma flow, and the ablation positions of the dust particles in an ergodic layer change toward the outboard side of the torus for higher plasma densities. The effect of the boron ion flow in the divertor leg on the deflection is investigated by coupling the two codes self-consistently. The simulation predicts that the boron ions in the divertor leg, which are produced by sputtering on the divertor plates, which do not affect the change in the ablation positions. It also shows that the ablation positions move toward the inboard side and approach the Last Closed Flux Surface (LCFS) in case of increased boron dust drop rates, which is caused by the lowered plasma flow in the upper divertor leg due to the lowered electron temperature by radiation cooling by the dropped dust particles.</p>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"64 7-8","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ctpp.202300105","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140026416","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":"N-convergence in one–component plasma: Comparison of Coulomb, Ewald, and angular–averaged Ewald potentials","authors":"G. S. Demyanov,&nbsp;A. S. Onegin,&nbsp;P. R. Levashov","doi":"10.1002/ctpp.202300164","DOIUrl":"10.1002/ctpp.202300164","url":null,"abstract":"<p>In this study, we investigate the dependence of potential energy of the one–component plasma on the number of particles with pure Coulomb, Ewald, and angular–averaged Ewald potentials. We show that in the weakly–coupled regime, the Coulomb potential provides a faster convergence of the energy to the thermodynamic limit. However, in the medium- and, especially, strong-coupling regime, the Ewald potential shows significantly better convergence. Thus, the criticism of the Ewald potential in [Fraser et al. Phys. Rev. B <b>53</b>, 1814 (1996)] within classical simulations turns out to be unjustified in this case: the accounting for long-range interaction effects greatly improves the <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>N</mi>\u0000 </mrow>\u0000 <annotation>$$ N $$</annotation>\u0000 </semantics></math>-convergence of one–component plasma thermodynamic functions.</p>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"64 6","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139979119","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":"Self-organization of plasma edge turbulence in interaction with recycling neutrals","authors":"V. Quadri,&nbsp;P. Tamain,&nbsp;Y. Marandet,&nbsp;H. Bufferand,&nbsp;N. Rivals,&nbsp;G. Ciraolo,&nbsp;G. Falchetto,&nbsp;R. Düll,&nbsp;H. Yang","doi":"10.1002/ctpp.202300146","DOIUrl":"10.1002/ctpp.202300146","url":null,"abstract":"<p>Experimental results from several tokamaks suggest a strong impact of divertor density regimes on turbulent transport in the edge plasma. Reciprocally, the change in transverse transport and SOL width affects the access to density regimes, making it a fundamental topic for heat exhaust issue. Such phenomenology is highly nonlinear and can only be approached quantitatively using numerical simulations treating turbulence and neutrals recycling physics self-consistently. In this study, the SOLEDGE3X edge multi-fluid code is used to investigate the mutual interaction between edge plasma turbulence and neutrals recycling. A fluid neutrals model based on the assumption of a charge-exchange-dominated plasma-neutral interaction has been implemented. Two simulations in circular geometry are compared: one without neutrals, where the particle flux is driven by a constant in flux from the core region, and the other one with neutrals recycling included in which the particle input to the system is self-consistently injected by a gas puff from the midplane. The presence of the neutrals triggers three types of perturbations on the plasma: a local and non-axisymmetric one driven by the gas puff, a global perturbation affecting both profiles and turbulence properties in the whole domain, and a local one in the vicinity of the limiter where recycling occurs. The largest effect of the inclusion of self-consistent neutrals recycling is a large-scale reorganization of the plasma profiles and turbulence properties due to the dissociation of particle and energy fluxes. These effects are expected to be more important at higher densities regimes or in diverted configuration.</p>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"64 7-8","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ctpp.202300146","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139979105","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":"Numerical study on dust particle charging and dynamics in continuous and pulsed radio frequency argon discharges","authors":"Abdelhak Missaoui,&nbsp;Morad El kaouini,&nbsp;Hassan Chatei","doi":"10.1002/ctpp.202300176","DOIUrl":"10.1002/ctpp.202300176","url":null,"abstract":"<p>Charging and dynamics of a spherical dust grain injected into a continuous and pulsed radio frequency (RF) discharge have been studied using a one-dimensional fluid model. First, the plasma characteristics of the two types of discharges are computed and compared. In the pulsed discharge, it is found that the central electron density exhibits a periodic variation while the averaged electron density is lower compared to that in the continuous discharge due to the decrease in the total ionization rate. Further, the dust charge is computed using the plasma characteristics. It is found that the dust charge negatively increases as the duty cycle ratio increases. Also, the charge in the pulsed discharge is lower in comparison to the continuous discharge due to the shorter duration of the pulsed RF discharge limiting the amount of energy transferred to electrons. On the other hand, the dust particle remains in the powered sheath region exhibiting a damped oscillation in the two discharges with higher oscillation frequency in the continuous discharge.</p>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"64 9","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139968219","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":"Simulation study of the influence of the cross-field anomalous diffusion on the tungsten impurity transport in the scrape-off layer with activated drifts","authors":"Jin Guo,&nbsp;Yuchen Xu,&nbsp;Shifeng Mao,&nbsp;Guoliang Xu,&nbsp;Minyou Ye","doi":"10.1002/ctpp.202300130","DOIUrl":"10.1002/ctpp.202300130","url":null,"abstract":"<p>Tungsten (W) impurity eroded from the divertor target can degrade the confinement performance of future fusion reactors. The mechanism of the effect of <i>E</i> × <i>B</i> drift on the W transport in the scrape-off layer (SOL) was investigated with a fixed cross-field anomalous particle diffusion coefficient for W ions (<i>D</i>_⊥,W) of 1 m²s⁻¹ in our previous simulation work, which indicates that the W flux entering the confined region (<i>Γ</i>_enter) and mean W concentration in the confined region (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msubsup>\u0000 <mi>C</mi>\u0000 <mi>W</mi>\u0000 <mi>avg</mi>\u0000 </msubsup>\u0000 </mrow>\u0000 <annotation>$$ {C}_{mathrm{W}}^{mathrm{avg}} $$</annotation>\u0000 </semantics></math>) can be increased by more than one order of magnitude by drifts. In this work, the influence of the cross-field anomalous diffusion on the W transport in the SOL is further investigated. The basic flow pattern of the W ion flux (<i>Γ</i>_W) keeps when <i>D</i>_⊥,W varying from 0.5 to 3 m²s⁻¹, and <i>Γ</i>_enter mainly comes from the hotter divertor region. Results show that <i>D</i>_⊥,W value affects the W leakage from divertor region and entry into confined region. Therefore, <i>Γ</i>_enter and <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msubsup>\u0000 <mi>C</mi>\u0000 <mi>W</mi>\u0000 <mi>avg</mi>\u0000 </msubsup>\u0000 </mrow>\u0000 <annotation>$$ {C}_{mathrm{W}}^{mathrm{avg}} $$</annotation>\u0000 </semantics></math> both decrease with increasing <i>D</i>_⊥,W. Mechanisms for cases w/wo drifts are compared.</p>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"64 7-8","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139924671","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":"Introducing electromagnetic effects in Soledge3X","authors":"Raffael Düll,&nbsp;Hugo Bufferand,&nbsp;Eric Serre,&nbsp;Guido Ciraolo,&nbsp;Virginia Quadri,&nbsp;Nicolas Rivals,&nbsp;Patrick Tamain","doi":"10.1002/ctpp.202300147","DOIUrl":"10.1002/ctpp.202300147","url":null,"abstract":"<p>In the pedestal region, electromagnetic effects affect the evolution of micro-instabilities and plasma turbulence. The transport code Soledge3X developed by the CEA offers an efficient framework for turbulent 3D simulation on an electrostatic model with a fixed magnetic field. The physical accuracy of the model is improved with electromagnetic induction, driven by the local value of the parallel component of the electromagnetic vector potential <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>A</mi>\u0000 <mo>∥</mo>\u0000 </msub>\u0000 </mrow>\u0000 <annotation>$$ {A}_{parallel } $$</annotation>\u0000 </semantics></math>, known from Ampère's law. It is solved implicitly in a coupled system with the vorticity equation on the electric potential <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>Φ</mi>\u0000 </mrow>\u0000 <annotation>$$ Phi $$</annotation>\u0000 </semantics></math>. The consequence is a basic electromagnetic behavior in the form of shear Alfvén waves. A finite electron mass prevents unphysical speeds but requires solving for the time evolution of the parallel current density <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>j</mi>\u0000 <mo>∥</mo>\u0000 </msub>\u0000 </mrow>\u0000 <annotation>$$ {j}_{parallel } $$</annotation>\u0000 </semantics></math> in the generalized Ohm's law. This term can be analytically included with little computational overhead in the system on <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>Φ</mi>\u0000 </mrow>\u0000 <annotation>$$ Phi $$</annotation>\u0000 </semantics></math> and <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>A</mi>\u0000 <mo>∥</mo>\u0000 </msub>\u0000 </mrow>\u0000 <annotation>$$ {A}_{parallel } $$</annotation>\u0000 </semantics></math> and improves its numerical condition, facilitating the iterative solving procedure. Simulations on a periodic slab case let us observe the predicted bifurcation of the wave propagation speed between the Alfvén wave and the electron thermal wave speeds for varying perpendicular wavenumbers. The first results on a circular geometry with a limiter attest to the feasibility of turbulent electromagnetic scenarios.</p>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"64 7-8","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ctpp.202300147","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139924668","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":"Electron–ion temperature relaxation in nonideal plasmas: High accuracy classical molecular dynamics simulations","authors":"Yaroslav S. Lavrinenko,&nbsp;Igor V. Morozov,&nbsp;Ilya A. Valuev","doi":"10.1002/ctpp.202300158","DOIUrl":"https://doi.org/10.1002/ctpp.202300158","url":null,"abstract":"<p>In this work, we prepare a simulation framework for a high-accuracy numerical study of electron–ion temperature relaxation in nonideal (strongly coupled) plasmas. The existing relaxation rate theories require either parameter selection or some pre-knowledge of the electron–ion correlation functions and effective interaction potentials. This makes non-equilibrium classical and quantum molecular dynamics simulations a crucial stage in the study of energy transfer rates. We begin by revisiting the classical molecular dynamics simulations of a system of equally charged particles with different masses on a neutralizing background. We accurately simulate this simple ab-initio (parameterless) system with controlled precision in terms of number of particles, mass ratio, and energy convergence. The predictions for the equally charged system are compared to the previous simulations and theories, which are reproduced with higher accuracy. We also perform a series of classical molecular dynamics simulations of the system of oppositely charged particles with the corrected Kelbg potential based on the quantum statistical approach. We analyze the differences and similarities between the same-charge and opposite-charge systems. Some remarks about the forthcoming application of quantum simulations with the help of WPMD or WPMD-DFT methods are given.</p>","PeriodicalId":10700,"journal":{"name":"Contributions to Plasma Physics","volume":"64 5","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141488251","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. 02/2024","authors":"","doi":"10.1002/ctpp.876","DOIUrl":"https://doi.org/10.1002/ctpp.876","url":null,"abstract":"<p>PIV images of a dusty plasma (obtained after averaging 50 images) flow in a horizontal plane at different vertical locations of confined dust grains in a potential well. (a) Topmost dust grains (b) 2mm below the topmost dust grains plane, (c) 4mm lower than the topmost dust grains plane, (d) 6mm lower than the topmost dust grains plane. Fig. 5 of the paper by Mangilal Choudhary. https://doi.org/10.1002/ctpp.202300072\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":"64 2","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ctpp.876","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139745063","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}