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Saturday, April 25, 2020 | History

2 edition of Plasma diffusion due to magnetic field fluctuations found in the catalog.

Plasma diffusion due to magnetic field fluctuations

H. Okuda

Plasma diffusion due to magnetic field fluctuations

  • 320 Want to read
  • 20 Currently reading

Published by Dept. of Energy, Plasma Physics Laboratory, for sale by the National Technical Information Service] in Princeton, N. J, [Springfield, Va .
Written in English

    Subjects:
  • Plasma diffusion.,
  • Magnetic fields.

  • Edition Notes

    Statementby H. Okuda, W. W. Lee, A. T. Lin, Plasma Physics Laboratory, Princeton University.
    SeriesPPPL ; 1498, PPPL (Series) -- 1498.
    ContributionsLee, W. W., Lin, A. T., United States. Dept. of Energy., Princeton University. Plasma Physics Laboratory.
    The Physical Object
    Pagination34 p. :
    Number of Pages34
    ID Numbers
    Open LibraryOL17649558M

    Plasma Containment by Magnetic field Configurations having Good and Bad Curvature of Magnetic field Lines On the characteristics of argon plasma in a Multi-pole Line-cusp Variable Magnetic Field PATEL, Anita (Institute For Plasma Research). with τ being a time period much longer than the drift period. The radial diffusion coefficient, being a measure of the radial diffusion rate, has been given much analytical treatment [Fälthammar, , a, b, ].It has been shown that perturbations in both the induced electric field (8/15 of the total magnetic flux variations) and the magnetic field (7/15 of the total magnetic flux Cited by: However, despite these similarities, Venus lacks an appreciable dipolar magnetic field." This "absence is due to Venus’s also lacking plate tectonics for the past b.y. (1 b.y.=10 9 yr). The generation of a global magnetic field requires core convection, which in turn requires extraction of heat from the core into the overlying mantle.   Fundamental statistical descriptions of plasma turbulence in magnetic fields Fundamental statistical descriptions of plasma turbulence in magnetic fields Krommes, John A. A pedagogical review of the historical development and current status (as of early ) of systematic statistical theories of plasma turbulence is undertaken.


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Plasma diffusion due to magnetic field fluctuations by H. Okuda Download PDF EPUB FB2

Get this from a library. Plasma diffusion due to magnetic field fluctuations. [H Okuda; W W Lee; A T Lin; United States.

Department of Energy.; Princeton University. Plasma Physics Laboratory.]. Above the F 2 peak where both wind-induced plasma drifts and magnetic field-aligned plasma diffusion are important in addition to photochemical reactions, it is not possible to calculate the electron density simply by equating local production and loss processes.

In this case, a more general conservation equation governs the spatial and. Plasma Transport, Heating and MHD Theory provides information pertinent to the theory of plasma transport, heating, and MHD.

This book describes the resistive steady states of elliptical cross-section plasmas. Organized into five parts encompassing 28 chapters, this book begins with an overview of the effects due to instabilities excited in the. 9. Field Fluctuations in a Plasma-Beam System References Chapter 6 / Electron Plasma in a Magnetic Field 1.

Plasma Dielectric Permittivity Tensor in a Magnetic Field 2. Electromagnetic Waves in a Plasma in a Magnetic Field (without taking Account of the Thermal Electron Motion) Edition: 1.

Dust particle diffusion across a magnetic field due Plasma diffusion due to magnetic field fluctuations book random charge fluctuations is reconsidered. Previously it was suggested that this mechanism could be one of the most effective processes.

Magnetic fluctuations due to the thermally excited magnetohydrodynamic (MHD) waves are investigated using fluid and kinetic models to describe a stable, uniform, compressible plasma in the range above the drift wave frequency and below the ion cyclotron frequency.

It is shown that the fluid model with resistivity yields spectral densities which are roughly Lorentzian, exhibits equipartition Cited by: 2. Definition. Plasma is a state of matter in which an ionized gaseous substance becomes highly electrically conductive to the point that long-range electric and magnetic fields dominate the behaviour of the matter.

The plasma state can be contrasted with the other states: solid, liquid, and gas. Plasma is an electrically neutral medium of unbound positive and negative particles (i.e.

the. Description. Bohm diffusion is characterized by a diffusion coefficient equal to =, where B is the magnetic field strength, T is the electron gas temperature, e is the elementary charge, k B is the Boltzmann constant.

History. It was first observed in by David Bohm, E. Burhop, and Harrie Massey while studying magnetic arcs for use in isotope separation. The first direct measurement of magnetic-fluctuation-induced particle flux in the core of a high-temperature plasma is reported.

Transport occurs due to magnetic field fluctuations associated with. The motion of charged particles in a plasma with stochastic magnetic field lines is investigated on the basis of the so-called A-Langevin equation.

In contrast to the well-known perpendicular (to an external magnetic field) transport, here the parallel transport is considered. @article{osti_, title = {Test particle transport in stochastic magnetic fields modeled by stochastic processes}, author = {Hannibal, L.}, abstractNote = {The theory of stochastic processes is applied to analyze the effect of magnetic-field perturbations on the motion of classical charged particles.

For arbitrary field fluctuations along the path of a particle, an approximate diffusion. Fourier spectra of magnetic field fluctuations observed by various spacecraft in the different domains of the magnetotail at quiet or moderately disturbed times demonstrated a number of practically universal features: (1) the presence of two kinks at low (\({\sim}5\times 10^{-2}~\mathrm{Hz}\)) and high (\({\sim}5\times 10^{-1}~\mathrm{Hz Cited by:   The long-standing problem of plasma diffusion across a magnetic field (B-field) is reviewed, with emphasis on low-temperature linear devices of finite length with the magnetic field aligned along an axis of these partially ionized plasmas, cross-field transport is dominated by ion–neutral collisions and can be treated simply with fluid by: Abstract.

When the amplitudes of instability waves grow, many other modes are induced by non-linear effects. The small scale modes die out by the large damping effect which results from the diffusion along the magnetic field B (See the second term of eq.

(31)). We consider the turbulent state in which the field fluctuations become stationary and : Michio Matsumoto. Plasma Electrodynamics, Volume 1: Linear Theory is a seven-chapter book that begins with a description of the general methods of describing plasma, particularly, kinetic and hydrodynamic methods.

Chapter 2 discusses the linear theory of magneto-hydrodynamic Edition: 1. Constant Magnetic Field 82 Magnetic Field of a Direct Current 82 Magnetic Field of a Current Surface 82 Magnetic Moment and Its Relation with Mechanical (Angular) Momentum Motion of Charges in a Field 85 Motion of a Charge in a Constant Uni­form Electric Field 85 Book of abstracts 2 Table of content to a strong spin effect due to changes in the illuminated surface of the for the first time to a scalar time series with electron density and magnetic field fluctuations along the background magnetic field direction being usedFile Size: KB.

In this paper the diffusion of guiding centers induced by stochastic magnetic and electric field fluctuations, with both time and space dependence, is analyzed for the case of tokamak plasmas.

General experimental results on tokamak fluctuations are used to derive guiding‐center equations that properly describe the particle motion.

These equations assume uniform average magnetic and electric Cited by: 5. Using the quasilinear kinetic theory of transport, it is shown that, contrary to the conventional description, the particle flow from magnetic fluctuations due to local normal modes is intrinsically ambipolar on spatial average.

This follows essentially from the local frame rotational invariance in the direction perpendicular to the magnetic by: Electromagnetic dispersion relation for cross-field beam injected plasma.

Anisotropy-driven growth rates. Quasilinear Fluctuation Diffusion Tensor. Electron Diffusion from Magnetic Flutter in Tokamaks. Polarization relations for low-frequency electromagnetic fluctuations. Qualitative picture of anomalous transport due to magnetic fluctuations.

The damping phenomenon is studied due to the collisions of ions and neutral particles and Landau approach on the turbulent spectra of kinetic Alfvén wave (KAW) in magnetized plasma which is inhomogeneous as well. The localization of waves is largely affected by inhomogeneities in plasma which are taken in transverse as well as parallel directions to the ambient magnetic : Ravinder Goyal, R.P.

Sharma. the magnetic field strength. It5. Three-Dimensional Plasma Diffusion in a Very Strong Magnetic Field D. Montgomery, C.-S. Liu (institute for Advanced Study), and G.

Vahala [Univ. of Iowa Report ^3; submitted to Physics of. Fluids]. The thermal equilibrium coefficient of spatial diffusion transverse to a strong uniform dc magnetic field is. Plasma Science BOX Controlled Chaos Fluctuations in a plasma-confining magnetic field can cause magnetic field lines to wander chaotically through the plasma.

Charged particles that follow the field lines will then also wander chaotically. A numerical model for low- pressure plasma in a toroidal magnetic field: J.

Johnson: Politzer, Peter A. Drift instability in collision- less alkali metal plasmas: H. Hendel: Gurnee, Mark N. Effect of a magnetic field on the diffusion of an electron- hole plasma: W.

Hooke, G. Goldsmith: Marsh, Jeffrey B. In a plasma with a magnetic field, each particle has a magnetic moment J10, and the quantity M is the sum of all these Jl.a's in I m3. But we now have 1 Moc­ B The relation between M and H (or B) is no longer linear, and we cannot write B= H with f.J-m constant.

Download figure: Standard image High-resolution image Export PowerPoint slide Stochastization of the magnetic field due to destruction of the magnetic surface was already predicted in the early stages of fusion plasma research [67, 68].Later, such deformation of the flux surface was also confirmed in experiments [27, 69–71].The transport is considered to be affected in the stochastic layer Cited by:   Abstract.

Non-linear, three-dimensional, time-dependent fluid simulations of whistler wave turbulence are performed to investigate role of whistler waves in soCited by: The properties of chaotic advection arising from defect turbulence, that is, weak turbulence in the electroconvection of nematic liquid crystals, were experimentally investigated.

Defect turbulence is a phenomenon in which fluctuations of convective rolls arise and are globally disturbed while maintaining convective rolls locally.

The time-dependent diffusion coefficient, as measured from the Cited by: 3. For both conditions, the regions outside the plasma jets have large fluctuations due to vortices, while the plasma core regions have negligibly small fluctuation because high-temperature plasmas offer much larger viscosities.

When the magnetic field is applied, the fluctuation is suppressed by: 5. Diffusion of guiding centres due to a stochastic magnetic field and a two-state stochastic acceleration; Subdiffusive behavior in sheared magnetic configurations; Diagram of collisional regimes for particle diffusion in a stochastic magnetic field; Magnetic topology in a tokamak due to current filaments.

noisy electric field due to potential differences between different magnetic field lines, and are thus diffused radially. When the cusp is turned on, most of the magnetic lines passing through the source intersect the stain-less steel cylinder bounding the plasma, and electrons on.

The role of fast electrons for the confinement of plasma by magnetic cusps and the diffusion coefficient as From these definitions the Einstein relation is an immediate consequence. The flux (4) can now be written as r = n,v = nep.E - (5) A diffusion-like is obtained by inserting the flux into the continuity equation 3.

Present conjecture is that global-scale, low-frequency electromagnetic fluctuations, perhaps induced by solar wind buffeting of the magnetosphere or time-dependent atmospheric dynamo processes, allow particles to randomly traverse magnetic field lines to close-in distances, gaining energy in the process.

We have discussed above that the plasma particles are connected to the magnetic field, in such a way that they gyrate around the field. At the same time, when the magnetic field is moving, the plasma is moving along.

However, we also know that a magnetic field can diffuse through a region with conductivity σ with a characteristic time scale τ. Plasma and fluid turbulence: theory and modelling A. Yoshizawa, S.I. Itoh, K. Itoh This monograph is founded on the belief that the cooperation of theory and modelling with direct numerical simulation and experimental observations is indispensable for forming a firm understanding of the evolution of nature, in this case the theory and.

This complete introduction to plasma physics and controlled fusion by one of the pioneering scientists in this expanding field offers both a simple and intuitive discussion of the basic concepts of this subject and an insight into the challenging problems of current research.

Make the plasma big enough, and for a given diffusion rate, the particles will be confined long enough to fuse before they exit of the plasma volume.

This is an extended comment on magnets. Typically one of the more expensive components of a tokamak are the field coils. Cosmic rays in interplanetary magnetic fields. [I N Toptygin] Particle Acceleration Due to Random Plasma Motions: Fermi Mechanism.- Particle Acceleration in the Moving Cloud Model.- Acceleration Due to Large-scale Motions of the Medium.- Theory of Galactic Cosmic Ray Modulation by Solar Wind Magnetic Field.- Magnetic reconnection, the merging of oppositely directed magnetic fields that leads to field reconfiguration, plasma heating, jetting and acceleration, is one of the most celebrated processes in collisionless plasmas.

It requires the violation of the frozen-in condition which ties gyrating charged particles to the magnetic field inhibiting by: Turbulence in the edge plasma of a tokamak is a key actor in the determination of the confinement properties.

The divertor configuration seems to be beneficial for confinement, suggesting an effect on turbulence of the particular magnetic geometry introduced by the X-point.

Simulations with the 3D fluid turbulence code TOKAM3X are performed here to evaluate the impact of a diverted Cited by: 1. Diffusive shock acceleration is the theory of particle acceleration through multiple shock crossings.

In order for this process to proceed at a rate that can be reconciled with observations of high-energy electrons in the vicinity of the shock, and for cosmic rays protons to be accelerated to energies up to observed galactic values, significant magnetic field amplification is required.

In this. (2) When this reconnection lasts and field lines are piled up in the magnetotail, another reconnection takes place among the piled‐up field lines, and expansion phase of substorm begins. (3) Plasmas in the magnetosphere can move not only by convection but also by Author: A.

Nishida.In her Ph.D. thesis she demonstrated for the first time how Kelvin-Helmholtz Instability can produce significant plasma transport due to magnetic reconnection. She obtained her doctorate in Physics in after which she worked as a post-doctoral research associate .