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Physics of fluids. B, Plasma physics最新文献

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Mode conversion at electron cyclotron harmonics with finite k 有限k下电子回旋谐波的模式转换
Physics of fluids. B, Plasma physics Pub Date : 1993-11-01 DOI: 10.1063/1.860587
J. Hu, D. Swanson
{"title":"Mode conversion at electron cyclotron harmonics with finite k","authors":"J. Hu, D. Swanson","doi":"10.1063/1.860587","DOIUrl":"https://doi.org/10.1063/1.860587","url":null,"abstract":"Relativistic plasma mode conversion‐tunneling equations at the second and third electron cyclotron harmonics are derived. A finite k∥ is introduced which keeps the coupling between the O‐mode, the X‐mode and the Bernstein wave in the mode conversion problem for the first time. The solutions for these mode conversion problems without absorption are obtained, and the connection formulas between different wave branches are established. The corresponding transmission, reflection and conversion coefficients are also given. A comparison between the coupled equation and the uncoupled equations is also made.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132802764","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
Radiation-dependent ionization model for laser-created plasmas 激光产生等离子体的辐射依赖电离模型
Physics of fluids. B, Plasma physics Pub Date : 1993-11-01 DOI: 10.1063/1.860586
M. Busquet
{"title":"Radiation-dependent ionization model for laser-created plasmas","authors":"M. Busquet","doi":"10.1063/1.860586","DOIUrl":"https://doi.org/10.1063/1.860586","url":null,"abstract":"For the simulation of laser‐created plasmas, hydrodynamic codes need an atomic physics package, for both the equation of state and the optical properties, which does not use the hypothesis of local thermodynamical equilibrium (LTE). However, in x‐ray laser studies, as well as in indirect drive inertial confinement fusion studies, high‐Z materials can be found where radiation trapping can induce a significant departure from the optically thin description. A method is presented in which an existing LTE code can be changed into a non‐LTE code with radiation‐dependent ionization. This method is numerically simple and its cost, in terms of computing time, is low enough to be used in two‐dimensional simulations.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132859673","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: 106
A closed set of conservation laws and the evolution of the electron magnetic moment in the collisionless solar wind 一组封闭的守恒定律和无碰撞太阳风中电子磁矩的演化
Physics of fluids. B, Plasma physics Pub Date : 1993-11-01 DOI: 10.1063/1.860581
P. Alexander
{"title":"A closed set of conservation laws and the evolution of the electron magnetic moment in the collisionless solar wind","authors":"P. Alexander","doi":"10.1063/1.860581","DOIUrl":"https://doi.org/10.1063/1.860581","url":null,"abstract":"A hydromagnetic equation system for the interplanetary collisionless solar wind is used to derive a set of conservation laws for that medium. It is found that every equation of the original system, including the closure relation, is related to one conservation law. The set that has been derived does not only include the traditional laws, but also a new one for the magnetic moment of the electrons. The conservation set is then used to obtain the space constants for the solar coronal expansion. The new law yields a constant that has not been predicted by other models.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115378198","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: 0
Arbitrary mode number boundary‐layer theory for nonideal toroidal Alfvén modes 非理想环面alfv<s:1>模态的任意模数边界层理论
Physics of fluids. B, Plasma physics Pub Date : 1993-11-01 DOI: 10.1063/1.860617
H. Berk, R. Mett, D. Lindberg
{"title":"Arbitrary mode number boundary‐layer theory for nonideal toroidal Alfvén modes","authors":"H. Berk, R. Mett, D. Lindberg","doi":"10.1063/1.860617","DOIUrl":"https://doi.org/10.1063/1.860617","url":null,"abstract":"The theory of toroidicity‐induced Alfven eigenmodes (TAE) and kinetic TAE (KTAE) is generalized to arbitrary mode numbers for a large aspect ratio low‐beta circular tokamak. The interaction between nearest neighbors is described by a three‐term recursion relation that combines elements from an outer region, described by the ideal magnetohydrodynamic equations of a cylinder, and an inner region, which includes the toroidicity and the nonideal effects of finite ion Larmor radius, electron inertia, and collisions. By the use of quadratic forms, it is proven that the roots of the recursion relation are stable and it is shown how perturbation theory can be applied to include frequency shifts due to other kinetic effects. Analytic forms are derived which display the competition between the resistive and radiative damping, where the radiation is carried by kinetic Alfven waves. When the nonideal parameter is small, the KTAE modes appear in pairs. When this parameter is large, previously found scaling for the single gap case is reproduced analytically.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"46 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114040319","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: 62
Fluctuation-induced transport and poloidal rotation in the interchangeable module stellarator 可互换模组仿星器中波动诱导输运和极向旋转
Physics of fluids. B, Plasma physics Pub Date : 1993-11-01 DOI: 10.1063/1.860574
P. G. Matthews, David L. T. Anderson, F. Anderson, J. Shohet, J. Talmadge
{"title":"Fluctuation-induced transport and poloidal rotation in the interchangeable module stellarator","authors":"P. G. Matthews, David L. T. Anderson, F. Anderson, J. Shohet, J. Talmadge","doi":"10.1063/1.860574","DOIUrl":"https://doi.org/10.1063/1.860574","url":null,"abstract":"Probe measurements over the two‐dimensional plasma cross section of the average and fluctuating density, electron temperature, and potential, as well as the Reynolds stress, have been made in the Interchangeable Module Stellarator (IMS) [D. T. Anderson, J. A. Derr, and J. L. Shohet, IEEE Trans. Plasma Sci. PS‐9, 212 (1981)]. These measurements were performed at two magnetic field strengths, and also when a positively biased electrode induces a poloidal plasma flow. The data shows the fluctuation‐induced transport to be poloidally asymmetric and dependent upon the location of the electron cyclotron resonance position, and upon the electrode biasing. The induced poloidal plasma flow changes the nominally outward fluctuation‐induced particle transport to be inward (negative radial transport) by changing the phase relationship of the density and potential oscillations. The amplitude of the density and potential fluctuations are, in general, not reduced by the sheared poloidal flow. Calculations are presented comparing the computed Reynolds stress induced poloidal plasma flows with the flow calculated from momentum balance.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116181535","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
Plasma structures in front of a floated emissive electrode 漂浮发射电极前的等离子体结构
Physics of fluids. B, Plasma physics Pub Date : 1993-11-01 DOI: 10.1063/1.860589
S. Ishiguro, N. Sato
{"title":"Plasma structures in front of a floated emissive electrode","authors":"S. Ishiguro, N. Sato","doi":"10.1063/1.860589","DOIUrl":"https://doi.org/10.1063/1.860589","url":null,"abstract":"A particle simulation with plasma source is carried out on plasma structures generated by an electron emissive electrode floated in a collisionless plasma. When low‐temperature, high‐density thermal electrons are emitted, there appears a negative potential dip in front of the electrode, which is always accompanied by a low‐frequency oscillation. On the other hand, three regimes of plasma structures appear for an electron beam injection. When a high‐flux electron beam is injected, an electron sheath is generated in front of the electrode. The sheath reflects ions flowing to the electrode, providing an increase in the plasma density. When a low‐flux electron beam is injected, no electron sheath is generated. When an intermediate‐flux beam is injected, the electron sheath structure appears periodically in time. The lifetime of the sheath is proportional to the system length. These results of beam injection are almost consistent with those of a Q‐machine experiment.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"452 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123635653","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: 11
Ion temperature profile deconvolution and corrections to confinement parameters in spheromaks 球形标记中离子温度分布反褶积及约束参数修正
Physics of fluids. B, Plasma physics Pub Date : 1993-11-01 DOI: 10.1063/1.860619
R. M. Mayo, D. J. Hurlburt, Juan C Fernández
{"title":"Ion temperature profile deconvolution and corrections to confinement parameters in spheromaks","authors":"R. M. Mayo, D. J. Hurlburt, Juan C Fernández","doi":"10.1063/1.860619","DOIUrl":"https://doi.org/10.1063/1.860619","url":null,"abstract":"The purpose of this work is to determine ion temperature profiles in spheromaks [Nucl. Fusion 19, 489 (1979)] for the first time. Knowledge of the ion temperature profile is necessary in the correct calculation of plasma confinement parameters. The work herein details the calculation of ion temperature profiles for the Compact Torus Experiment (CTX) [Nucl. Fusion 28, 1555 (1988)] and S‐1 [Phys. Rev. Lett. 46, 188 (1981)] spheromaks. Data from single chord Doppler ion temperature measurements in these devices have been analyzed with the aid of a one‐dimensional equilibrium charge state transport code. Using electron temperature and density profiles from Thomson scattering, and estimates for transport rates, a most probable position for the emission of line radiation can be determined and correlated with the measured Doppler ion temperature, thus generating an ion temperature profile. From this ion temperature profile determination, plasma confinement parameters for the small solid flux conserver CTX [Phys....","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122362538","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
General theory of Onsager symmetries for perturbations of equilibrium and nonequilibrium steady states 平衡态和非平衡态扰动的Onsager对称的一般理论
Physics of fluids. B, Plasma physics Pub Date : 1993-11-01 DOI: 10.1063/1.860614
J. Krommes, G. Hu
{"title":"General theory of Onsager symmetries for perturbations of equilibrium and nonequilibrium steady states","authors":"J. Krommes, G. Hu","doi":"10.1063/1.860614","DOIUrl":"https://doi.org/10.1063/1.860614","url":null,"abstract":"The theory of Onsager symmetry is reconsidered from the point of view of its application to nonequilibrium, possibly turbulent steady states. A dynamical formalism based on correlation and response functions is used; understanding of its relationship to more conventional approaches based on entropy production enables one to resolve various confusions about the proper use of the theory, even near thermal equilibrium. Previous claims that ‘‘kinematic’’ flows must be excluded from considerations of Onsager symmetry are refuted by showing that suitably defined reversible and irreversible parts of the Onsager matrix separately obey the appropriate symmetry; fluctuating hydrodynamics serves as an example. It is shown that Onsager symmetries are preserved under arbitrary covariant changes of variables; the Weinhold metric is used as a fundamental tensor. Covariance is used to render moot the controversy over the proper choice of fluxes and forces in neoclassical plasma transport theory. The fundamental distincti...","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127062826","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: 31
Theory of runaway collisional transport 失控碰撞输运理论
Physics of fluids. B, Plasma physics Pub Date : 1993-11-01 DOI: 10.1063/1.860615
M. Tessarotto, R. White
{"title":"Theory of runaway collisional transport","authors":"M. Tessarotto, R. White","doi":"10.1063/1.860615","DOIUrl":"https://doi.org/10.1063/1.860615","url":null,"abstract":"The purpose of this paper is to formulate the transport problem for a multispecies rotating toroidal magnetoplasma in the so‐called runaway regime, which is defined by an appropriate ordering of relevant characteristic frequencies, in particular, the Larmor frequency, the characteristic acceleration frequency due to the applied electric field and the effective collision frequency, all evaluated at some characteristic speed v0. A suitable form of the gyrokinetic equation is obtained to describe the time‐dependent, multispecies plasma response to an applied electric field, in toroidal geometry and for a strongly rotating, quiescent, and collisional plasma. Its moment equations are proven to imply the reduction of the energy equation to Joule’s law, as well as consequences on the form of Ohm’s law and of the Grad–Shafranov equation. To construct an approximate solution of the gyrokinetic equation and to evaluate all relevant fluxes, appearing in the moment equations, a general variational solution method is ...","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"97 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128000193","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
The radial structure of the ion‐temperature‐gradient‐driven mode 离子温度梯度驱动模式的径向结构
Physics of fluids. B, Plasma physics Pub Date : 1993-11-01 DOI: 10.1063/1.860576
F. Romanelli, F. Zonca
{"title":"The radial structure of the ion‐temperature‐gradient‐driven mode","authors":"F. Romanelli, F. Zonca","doi":"10.1063/1.860576","DOIUrl":"https://doi.org/10.1063/1.860576","url":null,"abstract":"An analysis of the radial structure of the ion‐temperature‐gradient‐driven mode is presented and the dependence of the radial correlation length Lr on parameters such as magnetic shear is discussed. It is found that Lr decreases algebraically with increasing shear for moderate to large shear values, and it decreases exponentially with decreasing shear for low shear values. These results seem in qualitative agreement with several experiments which observe strong reduction of the transport coefficients close to the magnetic axis.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116655053","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: 155
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