Turbulence in a reacting contact surface

Johnson, J. A.; Johnson, Lewis; Lu, XY

doi:10.1063/1.857675

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…These parameters have been measured in plasmas created by both arc-driven [12][13][14][15][16] and diaphragm 17 shock tubes, glow discharge tubes, 11,18 microwaves, 21,22 Nd:YAG, 19 and CW 20 lasers. These turbulent characteristics were measured on time scales from micro to nanosecond, at data rates between 250.0 kHz (Ref.…”

Section: Introductionmentioning

confidence: 99%

Mass dependency of turbulent parameters in stationary glow discharge plasmas

et al. 2013

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A direct current glow discharge tube is used to determine how mass changes the effects of certain turbulence characteristics in a weakly ionized gas. Helium, neon, argon, and krypton plasmas were created, and an axial magnetic field, varied from 0.0 to 550.0 Gauss, was used to enhance mass dependent properties of turbulence. From the power spectra of light emission variations associated with velocity fluctuations, determination of mass dependency on turbulent characteristic unstable modes, energy associated with turbulence, and the rate at which energy is transferred from scale to scale are measured. The magnetic field strength is found to be too weak to overcome particle diffusion to the walls to affect the turbulence in all four types of plasmas, though mass dependency is still detected. Though the total energy and the rate at which the energy moves between scales are mass invariant, the amplitude of the instability modes that characterize each plasma are dependent on mass. V C 2013 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

Mass dependency of turbulent parameters in stationary glow discharge plasmas

et al. 2013

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“…8 Turbulence is also studied in weakly ionized plasma column of a glow discharge, 9 arc-driven shock tube plasmas, 10 and shock tube's contact surface. 11 Chaotic analyses in plasma physics are also popular, with attempts to control the chaos by small time-dependent perturbations on a system parameter. [12][13][14][15] Here, in this paper, we confirm the plasma electron density and temperature, carry out the analyses for neutral light fluctuations to establish the relationship between the standard turbulent and chaotic parameters and the experimental parameters, such as microwave power and atomic constituents.…”

Section: Introductionmentioning

confidence: 99%

Turbulent microwave plasma thermodynamics for fundamental fluctuation modes

Podder¹,

Johnson²,

Mezonlin³

2002

Physics of Plasmas

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Articles you may be interested inSimultaneous use of camera and probe diagnostics to unambiguously identify and study the dynamics of multiple underlying instabilities during the route to plasma turbulencea) Rev. Sci. Instrum. 85, 11E813 (2014); 10.1063/1.4890250 The role of higher-order modes on the electromagnetic whistler-cyclotron wave fluctuations of thermal and nonthermal plasmas A study on the modification of density and plasma potential in presence of electron temperature fluctuations (abstract) Rev. Sci. Instrum. 72, 465 (2001); A 400 kHz, fast-sweep Langmuir probe for measuring plasma fluctuations Rev.

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The time evolution of turbulent parameters in reversed-field pinch plasmas

Titus

Alexander

Johnson

2013

Journal of Applied Physics

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Turbulence is abundant in fully ionized fusion plasmas, with unique turbulent characteristics in different phases of the discharge. Using Fourier and chaos-based techniques, a set of parameters have been developed to profile the time evolution of turbulence in high temperature, fusion plasmas, specifically in self-organized, reversed-field pinch plasma in the Madison Symmetric Torus. With constant density and plasma current, the turbulence profile is measured during ramp-up, magnetic reconnection, and increased confinement phases. During magnetic reconnection, a scan of plasma current is performed with a constant density. Analysis revealed that the energy associated with turbulence (turbulent energy) is found to increase when changes in magnetic energy occur and is correlated to edge ion temperatures. As the turbulent energy increases with increasing current, the rate at which this energy flow between scales (spectral index) and anti-persistence of the fluctuations increases (Hurst exponent). These turbulent parameters are then compared to the ramp-up phase and increased confinement regime.

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Turbulence in a reacting contact surface

Cited by 6 publications

References 15 publications

Mass dependency of turbulent parameters in stationary glow discharge plasmas

Mass dependency of turbulent parameters in stationary glow discharge plasmas

Turbulent microwave plasma thermodynamics for fundamental fluctuation modes

The time evolution of turbulent parameters in reversed-field pinch plasmas

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