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Investigation of surface boundary conditions for continuum modeling of RF plasmas. 射频等离子体连续体模型的表面边界条件研究。
arXiv: Plasma Physics Pub Date : 2018-04-26 DOI: 10.1063/1.5020983
Althea Wilson, B. Shotorban
{"title":"Investigation of surface boundary conditions for continuum modeling of RF plasmas.","authors":"Althea Wilson, B. Shotorban","doi":"10.1063/1.5020983","DOIUrl":"https://doi.org/10.1063/1.5020983","url":null,"abstract":"This work was motivated by a lacking general consensus in the exact form of the boundary conditions (BCs) required on the solid surfaces for the continuum modeling of RF plasmas. Various kinds of number and energy density BCs on solid surfaces were surveyed and how they interacted with the electric potential BC to affect the plasma was examined in two fundamental RF plasma reactor configurations. A second-order local mean energy approximation with equations governing the electron and ion number densities, and the electron energy density was used to model the plasmas. Zero densities and various combinations of drift, diffusion and thermal fluxes were considered to set up BCs. It was shown that the choice of BC can have a significant impact on the sheath and bulk plasma. The thermal and diffusion fluxes to the surface were found to be important. A pure drift BC for dielectric walls failed to produce a sheath.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81677221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Fluid simulations of plasma turbulence at ion scales: comparison with Vlasov-Maxwell simulations 离子尺度等离子体湍流的流体模拟:与Vlasov-Maxwell模拟的比较
arXiv: Plasma Physics Pub Date : 2018-04-04 DOI: 10.1063/1.5026656
D. Perrone, D. Perrone, T. Passot, D. Laveder, Francesco Valentini, P. Sulem, I. Zouganelis, P. Veltri, S. Servidio
{"title":"Fluid simulations of plasma turbulence at ion scales: comparison with Vlasov-Maxwell simulations","authors":"D. Perrone, D. Perrone, T. Passot, D. Laveder, Francesco Valentini, P. Sulem, I. Zouganelis, P. Veltri, S. Servidio","doi":"10.1063/1.5026656","DOIUrl":"https://doi.org/10.1063/1.5026656","url":null,"abstract":"Comparisons are presented between a hybrid Vlasov-Maxwell (HVM) simulation of turbulence in a collisionless plasma and fluid reductions. These include Hall-magnetohydrodynamics (HMHD) and Landau fluid (LF) or FLR-Landau fluid (FLR-LF) models that retain pressure anisotropy and low-frequency kinetic effects such as Landau damping and, for the last model, finite Larmor radius (FLR) corrections. The problem is considered in two space dimensions, when initial conditions involve moderate-amplitude perturbations of a homogeneous equilibrium plasma subject to an out-of-plane magnetic field. LF turns out to provide an accurate description of the velocity field up to the ion Larmor radius scale, and even to smaller scales for the magnetic field. Compressibility nevertheless appears significantly larger at the sub-ion scales in the fluid models than in the HVM simulation. High frequency kinetic effects, such as cyclotron resonances, not retained by fluid descriptions, could be at the origin of this discrepancy. A significant temperature anisotropy is generated, with a bias towards the perpendicular component, the more intense fluctuations being rather spread out and located in a broad vicinity of current sheets. Non-gyrotropic pressure tensor components are measured and their fluctuations are shown to reach a significant fraction of the total pressure fluctuation, with intense regions closely correlated with current sheets.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":"66 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86968564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
Gyrokinetic theory of slab universal modes and the non-existence of the Gradient Drift Coupling (GDC) instability 平板普遍模态的陀螺动力学理论与梯度漂移耦合(GDC)不稳定性
arXiv: Plasma Physics Pub Date : 2018-04-03 DOI: 10.1063/1.5024748
B. Rogers, B. Zhu, M. Francisquez
{"title":"Gyrokinetic theory of slab universal modes and the non-existence of the Gradient Drift Coupling (GDC) instability","authors":"B. Rogers, B. Zhu, M. Francisquez","doi":"10.1063/1.5024748","DOIUrl":"https://doi.org/10.1063/1.5024748","url":null,"abstract":"A gyrokinetic linear stability analysis of a collisionless slab geometry in the local approximation is presented. We focus on $k_parallel=0$ universal (or entropy) modes driven by plasma gradients at small and large plasma $beta$. These are small scale non-MHD instabilities with growth rates that typically peak near $k_perprho_isim 1$ and vanish in the long wavelength $k_perpto 0$ limit. This work also discusses a mode known as the Gradient Drift Coupling (GDC) instability previously reported in the gyrokinetic literature, which has a finite growth rate $gamma= sqrt{beta/[2(1+beta)]} C_s/|L_p|$ with $C_s^2=p_0/rho_0$ for $k_perpto 0$ and is universally unstable for $1/L_pneq 0$. We show the GDC instability is a spurious, unphysical artifact that erroneously arises due to the failure to respect the total equilibrium pressure balance $p_0+B_0^2/(8pi)=text{constant}$, which renders the assumption $B_0'=0$ inconsistent if $p_0'neq 0$.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":"181 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91450274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Collision properties of overtaking supersolitons with small amplitudes 小振幅超孤子的碰撞特性
arXiv: Plasma Physics Pub Date : 2018-03-28 DOI: 10.1063/1.5027448
C. P. Olivier, F. Verheest, W. Hereman
{"title":"Collision properties of overtaking supersolitons with small amplitudes","authors":"C. P. Olivier, F. Verheest, W. Hereman","doi":"10.1063/1.5027448","DOIUrl":"https://doi.org/10.1063/1.5027448","url":null,"abstract":"The collision properties of overtaking small-amplitude supersolitons are investigated for the fluid model of a plasma consisting of cold ions and two-temperature Boltzmann electrons. A reductive perturbation analysis is performed for compositional parameters near the supercritical composition. A generalized Korteweg-de Vries equation with a quartic nonlinearity is derived, referred to as the modified Gardner equation. Criteria for the existence of small-amplitude supersolitons are derived. The modified Gardner equation is shown to be not completely integrable, implying that supersoliton collisions are inelastic, as confirmed by numerical simulations. These simulations also show that supersolitons may reduce to regular solitons as a result of overtaking collisions.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90066098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
Numerical simulation of the geometrical-optics reduction of CE2 and comparisons to quasilinear dynamics. CE2几何光学还原的数值模拟及其与拟线性动力学的比较。
arXiv: Plasma Physics Pub Date : 2018-03-22 DOI: 10.1063/1.5018142
J. Parker
{"title":"Numerical simulation of the geometrical-optics reduction of CE2 and comparisons to quasilinear dynamics.","authors":"J. Parker","doi":"10.1063/1.5018142","DOIUrl":"https://doi.org/10.1063/1.5018142","url":null,"abstract":"Zonal flows have been observed to appear spontaneously from turbulence in a number of physical settings. A complete theory for their behavior is still lacking. Recently, a number of studies have investigated the dynamics of zonal flows using quasilinear theories and the statistical framework of a second-order cumulant expansion (CE2). A geometrical-optics (GO) reduction of CE2, derived under an assumption of separation of scales between the fluctuations and the zonal flow, is studied here numerically. The reduced model, CE2-GO, has a similar phase-space mathematical structure to the traditional wave-kinetic equation, but that wave-kinetic equation has been shown to fail to preserve enstrophy conservation and to exhibit an ultraviolet catastrophe. CE2-GO, in contrast, preserves nonlinear conservation of both energy and enstrophy. We show here how to retain these conservation properties in a pseudospectral simulation of CE2-GO. We then present nonlinear simulations of CE2-GO and compare with direct simulations of quasilinear (QL) dynamics. We find that CE2-GO retains some similarities to QL. The partitioning of energy that resides in the zonal flow is in good quantitative agreement between CE2-GO and QL. On the other hand, the length scale of the zonal flow does not follow the same qualitative trend in the two models. Overall, these simulations indicate that CE2-GO provides a simpler and more tractable statistical paradigm than CE2, but CE2-GO is missing important physics.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78511266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Particle-in-Cell Modeling of Laser Thomson Scattering in Low-Density Plasmas at Elevated Laser Intensities 高激光强度下低密度等离子体中激光汤姆逊散射的细胞内粒子模拟
arXiv: Plasma Physics Pub Date : 2018-03-16 DOI: 10.1063/1.5029820
A. Powis, M. Shneider
{"title":"Particle-in-Cell Modeling of Laser Thomson Scattering in Low-Density Plasmas at Elevated Laser Intensities","authors":"A. Powis, M. Shneider","doi":"10.1063/1.5029820","DOIUrl":"https://doi.org/10.1063/1.5029820","url":null,"abstract":"Incoherent Thomson scattering is a non-intrusive technique commonly used for measuring local plasma density. Within low-density, low-temperature plasma's and for sufficient laser intensity, the laser may perturb the local electron density via the ponderomotive force, causing the diagnostic to become intrusive and leading to erroneous results. A theoretical model for this effect is validated numerically via kinetic simulations of a quasi-neutral plasma using the Particle-in-Cell technique.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":"212 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73092406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
A technique for plasma velocity-space cross-correlation. 等离子体速度-空间互关技术。
arXiv: Plasma Physics Pub Date : 2018-03-14 DOI: 10.1063/1.5016352
S. Mattingly, F. Skiff
{"title":"A technique for plasma velocity-space cross-correlation.","authors":"S. Mattingly, F. Skiff","doi":"10.1063/1.5016352","DOIUrl":"https://doi.org/10.1063/1.5016352","url":null,"abstract":"An advance in experimental plasma diagnostics is presented and used to make the first measurement of a plasma velocity-space cross-correlation matrix. The velocity space correlation function can detect collective fluctuations of plasmas through a localized measurement. An empirical decomposition, singular value decomposition, is applied to this Hermitian matrix in order to obtain the plasma fluctuation eigenmode structure on the ion distribution function. A basic theory is introduced and compared to the modes obtained by the experiment. A full characterization of these modes is left for future work, but an outline of this endeavor is provided. Finally, the requirements for this experimental technique in other plasma regimes are discussed.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84602283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
High-frequency elastic moduli of two-dimensional Yukawa fluids and solids 二维汤川流体和固体的高频弹性模量
arXiv: Plasma Physics Pub Date : 2018-03-14 DOI: 10.1063/1.5025396
S. Khrapak, B. Klumov
{"title":"High-frequency elastic moduli of two-dimensional Yukawa fluids and solids","authors":"S. Khrapak, B. Klumov","doi":"10.1063/1.5025396","DOIUrl":"https://doi.org/10.1063/1.5025396","url":null,"abstract":"An approach to calculate high-frequency bulk and shear modului of two-dimensional (2D) weakly screened Yukawa fluids and solids is presented. Elastic moduli are directly related to sound velocities and other important characteristics of the system. In this article we discuss these relations and present exemplary calculation of the longitudinal, transverse, and instantaneous sound velocities and derive a differential equation for the Einstein frequency. Simple analytical results presented demonstrate good accuracy when compared with numerical calculations. The obtained results can be particularly useful in the context of 2D colloidal and complex (dusty) plasma monolayers.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82682049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Influence of a charge-gradient force on dust acoustic waves 电荷梯度力对尘埃声波的影响
arXiv: Plasma Physics Pub Date : 2018-03-12 DOI: 10.1063/1.5023480
A. Khrapak, S. Khrapak
{"title":"Influence of a charge-gradient force on dust acoustic waves","authors":"A. Khrapak, S. Khrapak","doi":"10.1063/1.5023480","DOIUrl":"https://doi.org/10.1063/1.5023480","url":null,"abstract":"The influence of a charge-gradient force, associated with variations of the particle charge in response to external perturbations, on the propagation of low-frequency waves in weakly coupled complex (dusty) plasmas is investigated. The magnitude of the effect is compared with that due to polarization force, studied previously in the literature. Numerical estimates are presented for the regime, where the orbital motion limited approach to particle charging is relevant.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88661425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Interaction of a supersonic particle with a three-dimensional complex plasma 超音速粒子与三维复杂等离子体的相互作用
arXiv: Plasma Physics Pub Date : 2018-03-02 DOI: 10.1063/1.5022773
E. Zaehringer, M. Schwabe, S. Zhdanov, D. Mohr, C. Knapek, P. Huber, I. Semenov, H. Thomas
{"title":"Interaction of a supersonic particle with a three-dimensional complex plasma","authors":"E. Zaehringer, M. Schwabe, S. Zhdanov, D. Mohr, C. Knapek, P. Huber, I. Semenov, H. Thomas","doi":"10.1063/1.5022773","DOIUrl":"https://doi.org/10.1063/1.5022773","url":null,"abstract":"The influence of a supersonic projectile on a three-dimensional complex plasma is studied. Micron sized particles in a low-temperature plasma formed a large undisturbed system in the new 'Zyflex' chamber during microgravity conditions. A supersonic probe particle excited a Mach cone with Mach number M $approx$ 1.5 - 2 and double Mach cone structure in the large weakly damped particle cloud. The speed of sound is measured with different methods and particle charge estimations are compared to calculations from standard theories. The high image resolution enables the study of Mach cones in microgravity on the single particle level of a three-dimensional complex plasma and gives insight to the dynamics. A heating of the microparticles is discovered behind the supersonic projectile but not in the flanks of the Mach cone.","PeriodicalId":8461,"journal":{"name":"arXiv: Plasma Physics","volume":"67 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91485785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
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