Collisions in Plasmas

Schmidt, G.

doi:10.1016/b978-0-12-626660-3.50015-8

Cited by 52 publications

(71 citation statements)

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“…The cusp magnetic field [13] has been incorpo cathode source in such a way that it helps to produce two distinct discharge regions for all configurations; the first is the narrow annular re HC extending from the tip of HA backwards. This is a thin 2 , ~ 0.1 ± 0.15 T. The cusps and edges produce three major elliptic zones on the outside of eld [13] has been incorporated into different structural designs of the hollow cathode source in such a way that it helps to produce two distinct discharge regions for all rst is the narrow annular region between the outer walls of HA and the inside of and their mixtures with noble gases are relatively easy to initiate the discharge. All of these experiments relied on the fact that the sputtering of HC introduces C can be ionized and be-come an active plasma constituent.…”

Section: Methodsmentioning

confidence: 99%

A cusp field, hollow cathode, carbon cluster ion source

Ahmad

Riffat

1999

Nuclear Instruments and Methods in Physics Research Section B:

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An all carbon hollow cathode ion source with a specially designed cusp magnetic field , is described. Velocity spectra from this source has shown that carbon cluster synthesis is taking place as a function of the source design, discharge parameters and the state of sooting. The cusp magnetic field seems to establish two distinct discharge regions within the source. The first is a narrow annular ring that is 2 mm thick and 15-20 mm long with restricted axial and radial extent of the cusp field. Here the source gas ionizes. The carbon atoms sputter of the cathode walls and subsequently get ionized. The other one is a cylindrical plasma region with the entire axial range of , . In this region the dynamics of the soot formation from the plasma constituent on the cathode walls seems to be related to the carbon clustering processes

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Section: Methodsmentioning

confidence: 99%

A cusp field, hollow cathode, carbon cluster ion source

Ahmad

Riffat

1999

Nuclear Instruments and Methods in Physics Research Section B:

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“…From j p •E we see that the time reversible polarizable currents are associated with the work done in establishing the kinetic energy 1 2 m a n a v E 2 in the EϫB convection. The plasma polarization current j p is the same as the polarization current in any polarizable material (Schmidt, 1979) except that the polarization is anisotropic in magnetized plasma. A consequence of the large polarization current across the magnetic field is that transverse electromagnetic waves with frequencies below the ion cyclotron frequency, which have the dispersion relation ⑀ Ќ 2 ϭc 2 k ʈ 2 where ⑀ Ќ ϭ1 ϩ4 c 2 m /B 2 ӷ1, propagate as Alfvé n waves /k ʈ ϭc/ͱ⑀ Ќ ХB/(4 m ) 1/2 ϵv A (Jackson, 1975).…”

Section: Drift-wave Eigenmodes In Toroidal Geometrymentioning

confidence: 99%

“…Stability analysis of dispersion relations is performed by the Nyquist diagram technique (Schmidt, 1979) shown in Fig. 10.…”

Section: B Wave Particle Power Transfer and The Nyquist Diagrammentioning

confidence: 99%

Drift waves and transport

1999

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Drift waves occur universally in magnetized plasmas producing the dominant mechanism for the transport of particles, energy and momentum across magnetic field lines. A wealth of information obtained from quasistationary laboratory experiments for plasma confinement is reviewed for drift waves driven unstable by density gradients, temperature gradients and trapped particle effects. The modern understanding of Bohm transport and the role of sheared flows and magnetic shear in reducing the transport to the gyro-Bohm rate are explained and illustrated with large scale computer simulations. The types of mixed wave and vortex turbulence spontaneously generated in nonuniform plasmas are derived with reduced magnetized fluid descriptions. The types of theoretical descriptions reviewed include weak turbulence theory, Kolmogorov anisotropic spectral indices, and the mixing length. A number of standard turbulent diffusivity formulas are given for the various space-time scales of the drift-wave turbulent mixing. [S0034-6861(99)00803-X] CONTENTS

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“…Substitute ε = e iκz F (ξ) into (14), where ξ = z− at and κ = m * a, to obtain F − κ 2 F + 2m * AF 3 = 0 (15) where F = d 2 F/dξ 2 . Multiply (15) by F .…”

Section: Discussionmentioning

confidence: 99%

“…Eq. (14) is the nonlinear Schrodinger equation for the envelope of the Langmuir waves [14]. The second term on the LHS of (14) is a cubic nonlinear term and the operator of this term, -A|ε| 2 , is the potential function of the Hamiltonian of the wave function ε.…”

Section: Derivation Of Nonlinear Schrodinger Equation For Langmuir Wavesmentioning

confidence: 99%

Basis of Ionospheric Modification by High-Frequency Waves

Kuo¹

2007

PIER

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Abstract-The requirements of achieving ionospheric modification by ground-transmitted HF heating waves are discussed. The directly relevant processes including linear mode conversion and parametric instabilities are explained physically. The nonlinear Schrodinger equation for Langmuir waves is reviewed and the initial conditions of two types of nonlinear solutions are discussed; from which the criterion for Langmuir soliton generation is pointed out.

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Collisions in Plasmas

Cited by 52 publications

References 0 publications

A cusp field, hollow cathode, carbon cluster ion source

A cusp field, hollow cathode, carbon cluster ion source

Drift waves and transport

Basis of Ionospheric Modification by High-Frequency Waves

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