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Physics of fluids. B, Plasma physics最新文献

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Comment on ‘‘Effects of neutral beam injection on poloidal rotation and energy transport in tokamaks’’ [Phys. Fluids B 5, 3012 (1993)] 对“中性束注入对托卡马克极向旋转和能量输运的影响”的评论[物理学报]。流体B 5,3012 (1993)]
Physics of fluids. B, Plasma physics Pub Date : 1993-12-01 DOI: 10.1063/1.860568
W. Stacey
{"title":"Comment on ‘‘Effects of neutral beam injection on poloidal rotation and energy transport in tokamaks’’ [Phys. Fluids B 5, 3012 (1993)]","authors":"W. Stacey","doi":"10.1063/1.860568","DOIUrl":"https://doi.org/10.1063/1.860568","url":null,"abstract":"A comment on effects of neutral beam injection on poloidal rotation and energy transport in tokamaks plasma is presented. The enhanced neoclassical effects such as poloidal mass flow, viscous heating and the convective flow of main plasma ions which is inward for coinjection should be taken into account in the interpretation of experimental data. (AIP)","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126137869","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
Coupled tearing modes in plasmas with differential rotation 差分旋转等离子体的耦合撕裂模式
Physics of fluids. B, Plasma physics Pub Date : 1993-12-01 DOI: 10.1063/1.860595
R. Dewar, M. Persson
{"title":"Coupled tearing modes in plasmas with differential rotation","authors":"R. Dewar, M. Persson","doi":"10.1063/1.860595","DOIUrl":"https://doi.org/10.1063/1.860595","url":null,"abstract":"The global asymptotic matching equations for multiple coupled resistive modes of arbitrary parity in a cylindrical plasma are derived. Three different variational principles are given for the outer region matching data, while the inner region analysis features a careful treatment of the symmetry‐breaking effect of a gradient in the equilibrium current for a zero‐β slab model. It is concluded that the usual constant‐ψ result remains valid and constrains the matrix matching formalism. The dispersion relation is compared with initial value calculations of a double tearing mode when there are small relative rotation velocities between the rational surfaces. In treating differential rotation within the asymptotic matching formalism, flow is ignored in the outer region and is assumed to affect the inner response solely through a Doppler shift. It is shown that the relative rotation can have a strong stabilizing effect by making all but one rational surface effectively ideal.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"54 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133531896","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: 59
An experimental study of magnetic islands as Hamiltonian systems 磁岛作为哈密顿系统的实验研究
Physics of fluids. B, Plasma physics Pub Date : 1993-12-01 DOI: 10.1063/1.860556
R. Gandy, G. Hartwell, J. Hanson, S. Knowlton, H. Lin
{"title":"An experimental study of magnetic islands as Hamiltonian systems","authors":"R. Gandy, G. Hartwell, J. Hanson, S. Knowlton, H. Lin","doi":"10.1063/1.860556","DOIUrl":"https://doi.org/10.1063/1.860556","url":null,"abstract":"Magnetic islands play an important role in determining plasma transport in toroidal magnetic confinement systems. The magnetic error fields and the associated islands can be theoretically described by a Hamiltonian approach. Experiments have been conducted on the Compact Auburn Torsatron [Fusion Technol. 18, 281 (1990)] to test the applicability and limits of the first‐order Hamiltonian theory to magnetic islands. A novel set of helical trim coils with the same spatial periodicity as an ι– = 1/2 magnetic island were used to create a perturbation field of variable magnitude and phase. Extensive experimental parametric studies of the magnetic island were conducted and compared with theory. It was found that the first‐order Hamiltonian theory is applicable for the complete range of experimental error fields.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115868808","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: 4
Nonlinear theory of stable, efficient operation of a gyrotron at cyclotron harmonics 回旋加速器在回旋谐波下稳定有效运行的非线性理论
Physics of fluids. B, Plasma physics Pub Date : 1993-12-01 DOI: 10.1063/1.860562
G. Saraph, T. Antonsen, G. Nusinovich, B. Levush
{"title":"Nonlinear theory of stable, efficient operation of a gyrotron at cyclotron harmonics","authors":"G. Saraph, T. Antonsen, G. Nusinovich, B. Levush","doi":"10.1063/1.860562","DOIUrl":"https://doi.org/10.1063/1.860562","url":null,"abstract":"One of the main obstacles in achieving stable, efficient operation at the cyclotron harmonics in a gyrotron is mode competition with parasitic modes at the fundamental frequency. In this article, the nonlinear dynamics of mode interactions in such a system are studied using a multifrequency, time‐dependent model. The results of numerical simulations for a second harmonic gyrotron are presented by considering two starting scenarios: (a) fast voltage rise or an instant turn‐on case, and (b) slow voltage rise case. For the first case, it is demonstrated that for a certain range of operating parameters, the presence of a parasitic mode at the fundamental can be helpful in the excitation of the second harmonic operating mode. In the second case, it is found that the unstable operating region increases with the value of the rise time constant of the electrode voltages. Stable, efficient gyrotron operation at the second harmonic is demonstrated using the numerical study.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127966704","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: 20
Modulational instabilities in strongly pumped systems 强抽运系统的调制不稳定性
Physics of fluids. B, Plasma physics Pub Date : 1993-12-01 DOI: 10.1063/1.860560
A. Héron, J. Adam
{"title":"Modulational instabilities in strongly pumped systems","authors":"A. Héron, J. Adam","doi":"10.1063/1.860560","DOIUrl":"https://doi.org/10.1063/1.860560","url":null,"abstract":"In this paper, results of a set of numerical simulations applicable to the problem of particle acceleration by the beating of high‐energy laser waves are presented. The simulations have periodic or open‐ended boundary conditions. The growth rates of the parametric instabilities that are present in both situations are identical. In all cases they yield a destruction of the large amplitude plasma wave in a very short time. The amplitude of the saturation level is shown to be strongly dependent on initial conditions. Finally, some results in the term of the evolution of the distribution function of the background plasma in the context of strong turbulence are shown.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133372023","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
Characterization of laser‐produced plasma density profiles using grid image refractometry 用网格图像折射法表征激光产生的等离子体密度分布
Physics of fluids. B, Plasma physics Pub Date : 1993-12-01 DOI: 10.1063/1.860558
R. Craxton, F. S. Turner, R. Hoefen, C. Darrow, E. F. Gabl, G. Busch
{"title":"Characterization of laser‐produced plasma density profiles using grid image refractometry","authors":"R. Craxton, F. S. Turner, R. Hoefen, C. Darrow, E. F. Gabl, G. Busch","doi":"10.1063/1.860558","DOIUrl":"https://doi.org/10.1063/1.860558","url":null,"abstract":"Grid image refractometry (GIR) is proposed as a technique for determining the two‐dimensional density profiles of long scale‐length laser‐produced plasmas. Its distinctive feature is that an optical probe beam is broken up into ‘‘rays’’ by being passed through a grid before traversing the plasma. The refraction angles of the rays are measured by imaging the plasma at two or more object planes and are integrated to yield the phase front. For cylindrically symmetric plasmas the density profile is then determined using Abel inversion. The feasibility of GIR is illustrated by an experiment in which a thick CH target was irradiated with ∼100 J of 527 nm radiation and diagnosed with a 20 ps, 263 nm probe. The resulting density profile is substantially larger than any that have previously been reported using interferometry and compares quite closely with hydrodynamic simulations.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133155323","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: 18
Limiting current in a crossed‐field gap 在交叉场隙中限制电流
Physics of fluids. B, Plasma physics Pub Date : 1993-12-01 DOI: 10.1063/1.860563
Y. Lau, P. Christenson, D. Chernin
{"title":"Limiting current in a crossed‐field gap","authors":"Y. Lau, P. Christenson, D. Chernin","doi":"10.1063/1.860563","DOIUrl":"https://doi.org/10.1063/1.860563","url":null,"abstract":"An analytic theory is presented that yields the maximum transmittable current across an anode–cathode gap that is embedded in an arbitrary transverse magnetic field (B). The limiting current is found to be relatively insensitive to B for all B<BH, where BH is the Hull cutoff magnetic field required for magnetic insulation. The classical Child–Langmuir solution is recovered in the limit B→0.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126455625","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: 58
Plasma autobiasing during Ohmic H‐mode in the STOR‐M tokamak storm托卡马克中欧姆H模等离子体自偏置
Physics of fluids. B, Plasma physics Pub Date : 1993-11-01 DOI: 10.1063/1.860616
W. Zhang, C. Xiao, A. Hirose
{"title":"Plasma autobiasing during Ohmic H‐mode in the STOR‐M tokamak","authors":"W. Zhang, C. Xiao, A. Hirose","doi":"10.1063/1.860616","DOIUrl":"https://doi.org/10.1063/1.860616","url":null,"abstract":"Application of a short current pulse on a nominal Ohmic discharge in the STOR‐M tokamak (Saskatchewan Torus‐Modified) [Phys. Fluids B 4, 3277 (1992)] triggers the Ohmic H‐mode characterized by reduced Hα radiation, increased electron density, and reduced edge density/magnetic fluctuations. Measurements of plasma floating potential at the plasma edge and in the scrape‐off layer indicate that the Ohmic H‐mode is accompanied by negative plasma autobiasing, which leads to a steeper radial electric field profile at the edge. Since the duration of the current pulse (≤20 kA, 100 μsec) is shorter than the resistive skin time (≂1 msec), preferential edge heating is expected, which is believed to be responsible for changes in the edge discharge condition favorable for inducing the Ohmic H‐mode. The electron density profile becomes steeper at the edge during the H‐mode, and clear formation of a density pedestal has been seen. The evolution of the density profile suggests the presence of particle pinch. An improved c...","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"7 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":"124931188","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: 13
Electromagnetic effect on the toroidal ion temperature gradient mode 电磁效应对环形离子温度梯度模式的影响
Physics of fluids. B, Plasma physics Pub Date : 1993-11-01 DOI: 10.1063/1.860623
J. Kim, W. Horton, J. Dong
{"title":"Electromagnetic effect on the toroidal ion temperature gradient mode","authors":"J. Kim, W. Horton, J. Dong","doi":"10.1063/1.860623","DOIUrl":"https://doi.org/10.1063/1.860623","url":null,"abstract":"A systematic study of the electromagnetic effects on the toroidal ion temperature gradient mode is presented using the local and nonlocal theories with the full kinetic terms. For the nonlocal study, a numerical code is developed to solve the electromagnetic gyrokinetic equation in the ballooning space. The electromagnetic coupling to the shear Alfven mode is shown to give a stabilization of the toroidal temperature gradient mode at almost the same plasma pressure as that at which the kinetically modified magnetohydrodynamic (MHD) ballooning mode becomes destabilized. The transitional β value is shown to be lower in the full kinetic description than in the fluid theory. Possible correlations of these stability results with experimental observations are discussed.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"1 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":"114316153","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: 81
The absorption mechanisms of whistler waves in cool, dense, cylindrically bounded plasmas 口哨波在冷的、密集的、圆柱形有界等离子体中的吸收机制
Physics of fluids. B, Plasma physics Pub Date : 1993-11-01 DOI: 10.1063/1.860609
B. M. Harvey, C. Lashmore-Davies
{"title":"The absorption mechanisms of whistler waves in cool, dense, cylindrically bounded plasmas","authors":"B. M. Harvey, C. Lashmore-Davies","doi":"10.1063/1.860609","DOIUrl":"https://doi.org/10.1063/1.860609","url":null,"abstract":"It can be shown that whistler waves with low parallel phase velocity can be subject to strong cyclotron damping, even when the wave frequency is well below the cyclotron frequency. This resonance arises as a result of the Doppler effect which is proportional to the plasma density and increases the frequency experienced by electrons moving in the opposite direction to the wave. In this paper the dispersion relation of whistler waves in a cylindrically bounded plasma is obtained and then solved. This geometry is desirable for its relevance to experiment and also for comparison with theoretical results by other authors. In addition to cyclotron damping, Landau damping as well as electron–ion, electron–electron, and electron–neutral collisions are all included thus enabling the relative importance of these damping mechanisms to be evaluated. The dispersion relation that is obtained is used to explore the transition from Landau dominated damping to cyclotron dominated damping.","PeriodicalId":113346,"journal":{"name":"Physics of fluids. B, Plasma physics","volume":"5 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":"130178042","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: 27
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