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Recent Trends in Plasma Chemistry and Spectroscopy Diagnostics
Published in Tanmoy Chakraborty, Lalita Ledwani, Research Methodology in Chemical Sciences, 2017
There are many nomenclatures like collisional plasmas, noncollisional plasma, neutral plasmas, non-neutral plasma, high-density plasma, low-density plasma, magnetic plasma, nonmagnetic plasma, high-energy density plasmas, dusty plasmas, grain plasmas, active and passive plasmas, etc., quite popular in plasma community. The classifications are based on dominance of the specific property of plasma, which is reflected by itself from the name.
A multi-order nonlinear meta-analysis of bifluidic fireball sheath fluctuations
Published in Waves in Random and Complex Media, 2023
Subham Dutta, Pralay Kumar Karmakar
The study of this plasma-electrode dynamics has continued for a long period of time with the help of constant voltage dc probe measurements. However, a magnificent development in this field has come along with the replacement of the constant voltage dc probe with a pulsing probe in the plasma system by D. G. Bills et al. in 1961 [11]. A few of the discrepancies accompanying the dc probe analysis have been minimized in the pulsed probe measurement. A similar experimental study conducted around five decades later has resulted in the discoveries of two anomalies of the dc probe (Langmuir probe) reading. The reading of the dc plasma probe has been found to differ with the pulsating probe in terms of the electron-ion density and plasma potential by 10-20% and 0.1-0.2 Te/e, respectively; where, Te/e denotes the electron thermal potential [12]. This plasma density-potential anomaly is a direct consequence of the formation of an additional localized non-neutral plasma sheath around the dc probe and its surrounding space charge effects [12]. The sheath developed around the probe manipulates the evaluation (reading) of the actual plasma densities and potentials. In contrast, in the pulsing probe, the sheath width is minimized due to the changing polarity of the electrostatic potential across the probe head. The main outcome of this study has hereby indicated a considerable advantage of using a pulsing probe over a dc probe diagnostic application [11].
Sympathetic cooling in two-species ion crystals in a Penning trap
Published in Journal of Modern Optics, 2018
S. Schmidt, T. Murböck, Z. Andelkovic, G. Birkl, K. König, W. Nörtershäuser, R. C. Thompson, M. Vogel
where is the permittivity of free space and is the Boltzmann constant. The Wigner–Seitz radius (the average ion-ion distance) is defined by at the ion number density n. The collective behaviour of confined ions in terms of a non-neutral plasma has been described in detail for example in [17].
Plasma Sheath Modelling for Computational Aerothermodynamics and Magnetohydrodynamics
Published in International Journal of Computational Fluid Dynamics, 2021
Bernard Parent, Kyle M. Hanquist
It is emphasised that such improvement in computational efficiency is performed while not altering the standard physical model of weakly ionised non-neutral plasma flows (outlined in the previous section) in any way. As the mesh is refined, the computationally efficient equations converge to the same solution as the standard equations (see test cases in Parent, Macheret, and Shneider 2015).