Drift instability in a positive ion–negative ion plasma

Rosenberg, M.; Merlino, R. L.

doi:10.1017/s0022377813000858

Cited by 23 publications

(24 citation statements)

References 21 publications

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“…A significant reduction of the drift wave frequency with εoccurs for values of ε > 0.99, or n e /n + < 10 −2 . The experimental results can also be compared with the linear kinetic theory model of Rosenberg and Merlino (2013) for drift waves in a magnetized, almost electron-free plasma containing positive and negative ions. A plot of the normalized wave frequency and growth rate vs. kρ − for ρ + /L n = 0.1, m + /m − = 39/350, T + /T − = 7.7, B = 0.3 T and n + = n − 1 × 10 9 cm −3 is shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Based on measurements of the plasma and wave properties, the waves are likely due to a drift instability driven by a radial density gradient. A local kinetic theory of drift instability in a positive ion-negative ion plasma, including weak collisional effects, was presented by Rosenberg and Merlino (2013). The effect of negative ions on drift waves in an Ar/O 2 plasma has also been studied recently by Knist et al (2011).…”

Section: Introductionmentioning

confidence: 99%

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Low-frequency electrostatic waves in a magnetized, current-free, heavy negative ion plasma

Kim¹,

Merlino

Meyer³

et al. 2013

J. Plasma Phys.

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We report experimental observations of a low-frequency (≪ ion gyrofrequency) electrostatic wave mode in a magnetized cylindrical (Q machine) plasma containing positive ions, very few electrons and a relatively large fraction (n−/ne > 103) of heavy negative ions (m−/m+ ≈ 10), and no magnetic field-aligned current. The waves propagate nearly perpendicular to B with a multiharmonic spectrum. The maximum wave amplitude coincided spatially with the region of largest density gradient suggesting that the waves were excited by a drift instability in a nearly electron-free positive ion–negative ion plasma

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-frequency electrostatic waves in a magnetized, current-free, heavy negative ion plasma

Kim¹,

Merlino

Meyer³

et al. 2013

J. Plasma Phys.

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“…8,12,17 It is insufficient to excite the multi-harmonic EIC in a normal positive ion electron plasma at present; however, the introducing of the heavy-mass negative ions can significantly lower the excitation threshold of the this wave. 18,19 In addition, negative ions also can excite rarefactive Kortemeg-de Vries (KdV) solitons and modified KdV solitons in a plasma, and these solitons are often observed in space plasmas and play important roles in nonlinear physics. 17 Most of the investigations focused on those electrostatic and density fluctuations and relevant plasma wave modes until now.…”

Section: -2mentioning

confidence: 99%

Laboratory experiments in the argon plasma perturbed by injections of the electronegative gases

et al. 2016

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In this study, laboratory observations of the perturbations of the magnetic field are reported due to the injection of attachment chemicals (CF4, SF6, and CO2) into argon plasmas. Besides the well-known electron density reduction, we also observed magnetic field perturbation in the experiment. The measured induced voltage Ḃ, which is taken as a proxy of the time-changing electromagnetic field, fluctuates in the boundary layer between the ambient plasmas and negative ions plasmas. Perturbations of the magnetic field were investigated by changing the ambient pressure and ratio of attachment chemicals. The measured Ḃ keeps increasing in these lower pressures; but it no longer increases as the ambient pressure higher than a threshold, e.g., for CF4, SF6, and CO2, the transition pressure is 6Pa, 5Pa and 4Pa, respectively. The magnitude of the Ḃ increase with the change of the ratio of release flow until at higher ratios, e.g., 40%. We transformed these time-sampled data into the frequency domain and found coherent modes with fundamental frequencies lying in the lower hybrid range. In addition, these coherent frequencies show a frequency drift with the increase of the contents of the negative ions. These modes were suggested as the magnetic component of electron-ion hybrid mode. This work has an important application in the study of artificially-created ionospheric depletion which is usually generated by releasing of attachment chemicals in the upper atmosphere.

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“…The influence of negative ions on drift ion wave instability in a weakly collisional magnetized plasma was investigated by using linear kinetic theory in Ref. 32. A year ago, the so called critical plasma concentration was invoked for negative ions, in order to study the nonlinear evolution of ionacoustic envelope wavepackets and to establish the existence of second-order ion-acoustic "Peregrine solitons" (breathers) experimentally [33].…”

Section: Introductionmentioning

confidence: 99%

Coexistence of negative and positive polarity electrostatic solitary waves in ultradense relativistic negative-ion-beam permeated plasmas

Elkamash

Kourakis

2018

Physics of Plasmas

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The criteria for occurrence and the dynamical features of electrostatic solitary waves in a homogeneous, unmagnetized ultradense plasma penetrated by a negative ion beam are investigated, relying on a quantum hydrodynamic model. The ionic components are modeled as inertial fluids, while the relativistic electrons obey Fermi-Dirac statistics. A new set of exact analytical conditions for localized solitary pulses to exist is obtained, in terms of plasma density. The algebraic analysis reveals that these depend sensitively on the negative ion beam characteristics, that is, the beam velocity and density. Particular attention is paid to the simultaneous occurrence of positive and negative potential pulses, identified by their respective distinct ambipolar electric field structure forms. It is shown that the coexistence of positive and negative potential pulses occurs in a certain interval of parameter values, where the ion beam inertia becomes significant.

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Drift instability in a positive ion–negative ion plasma

Cited by 23 publications

References 21 publications

Low-frequency electrostatic waves in a magnetized, current-free, heavy negative ion plasma

Low-frequency electrostatic waves in a magnetized, current-free, heavy negative ion plasma

Laboratory experiments in the argon plasma perturbed by injections of the electronegative gases

Coexistence of negative and positive polarity electrostatic solitary waves in ultradense relativistic negative-ion-beam permeated plasmas

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