Generation of electric fields and currents by neutral flows in weakly ionized plasmas through collisional dynamos

2016 ◽  
Vol 23 (8) ◽  
pp. 084503 ◽  
Author(s):  
Y. S. Dimant ◽  
M. M. Oppenheim ◽  
A. C. Fletcher
Keyword(s):  
Electric Fields ◽  
Ionized Plasmas ◽  
Weakly Ionized ◽  
Electric Fields And Currents

Computer Applications in Plasma Materials Processing

MRS Bulletin ◽  
1991 ◽  
Vol 16 (2) ◽  
pp. 16-22
Author(s):  
David B. Graves ◽  
Richard A. Gottscho
Keyword(s):  
Electric Fields ◽  
Electronic Materials ◽  
Surface Film ◽  
Reactive Species ◽  
Computer Applications ◽  
Materials Processing ◽  
Neutral Gas ◽  
Ionized Plasmas ◽  
Weakly Ionized ◽  
Chemically Reactive Species

In manufacturing microelectronic and optoelectronic devices, thin solid films of various sorts are routinely deposited and etched using low pressure, weakly ionized plasmas. The term “plasma” in this context implies an ionized gas with nearly equal numbers of positive and negative charges. This definition is not very restrictive, so. there are an enormous number of phenomena that are termed plasmas. For example, very hot, magnetized, fully ionized plasmas exist in stellar environments and thermonuclear fusion experiments. High temperature electric arcs are a form of plasma as well. In contrast, the plasmas used in electronic materials processing are near room temperature and the gas is usually weakly ionized. Indeed, due to the sensitivity of electronic devices to high temperatures, their low operating temperature is one of the major advantages of plasma processes.Plasma processing is attractive because of two important physiochemical effects: energetic free electrons in the plasma (heated by applied electric fields) dissociate the neutral gas in the plasma to create chemically reactive species; and free positive ions are accelerated by the plasma electric fields to surfaces bounding the plasma. Reactive species created in the plasma diffuse to surfaces and adsorb; wafers to be processed are typically placed on one of these surfaces.The combination of neutral species adsorption and positive ion bombardment results in surface chemical reaction. If the products of the surface reaction are volatile, they leave the surface and etching results. If the products are involatile, a surface film grows.

Phenomenological analysis of shock-wave propagation in weakly ionized plasmas

AIAA Journal ◽  
1998 ◽  
Vol 36 ◽  
pp. 816-822
Author(s):  
Igor V. Adamovich ◽  
Vish V. Subramaniam ◽  
J. W. Rich ◽  
Sergey O. Macheret
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
Phenomenological Analysis ◽  
Shock Wave Propagation ◽  
Ionized Plasmas ◽  
Weakly Ionized

scholarly journals Application of weakly ionized plasmas for materials sampling and analysis

1991 ◽  
Vol 19 (6) ◽  
pp. 1090-1113 ◽  
Author(s):  
M.W. Blades ◽  
P. Banks ◽  
C. Gill ◽  
D. Huang ◽  
C. LeBlanc ◽  
...  
Keyword(s):  
Ionized Plasmas ◽  
Weakly Ionized

Computational assessment of effects of electric fields and currents in tokamak edge plasmas

1995 ◽  
Vol 220-222 ◽  
pp. 982-986 ◽  
Author(s):  
M. Baelmans ◽  
D. Reiter ◽  
R.R. Weynants ◽  
R. Schneider
Keyword(s):  
Electric Fields ◽  
Tokamak Edge ◽  
Edge Plasmas ◽  
Electric Fields And Currents

scholarly journals Effects of solar eclipse on the electrodynamical processes of the equatorial ionosphere: a case study during 11 August 1999 dusk time total solar eclipse over India

2002 ◽  
Vol 20 (12) ◽  
pp. 1977-1985 ◽  
Author(s):  
R. Sridharan ◽  
C. V. Devasia ◽  
N. Jyoti ◽  
Diwakar Tiwari ◽  
K. S. Viswanathan ◽  
...  
Keyword(s):  
Electric Fields ◽  
Solar Eclipse ◽  
Equatorial Ionosphere ◽  
Hf Radar ◽  
F Region ◽  
Large Enhancement ◽  
Temporal Structures ◽  
E Region ◽  
Field Lines ◽  
Electric Fields And Currents

Abstract. The effects on the electrodynamics of the equatorial E- and F-regions of the ionosphere, due to the occurrence of the solar eclipse during sunset hours on 11 August 1999, were investigated in a unique observational campaign involving ground based ionosondes, VHF and HF radars from the equatorial location of Trivandrum (8.5° N; 77° E; dip lat. 0.5° N), India. The study revealed the nature of changes brought about by the eclipse in the evening time E- and F-regions in terms of (i) the sudden intensification of a weak blanketing ES-layer and the associated large enhancement of the VHF backscattered returns, (ii) significant increase in h' F immediately following the eclipse and (iii) distinctly different spatial and temporal structures in the spread-F irregularity drift velocities as observed by the HF radar. The significantly large enhancement of the backscattered returns from the E-region coincident with the onset of the eclipse is attributed to the generation of steep electron density gradients associated with the blanketing ES , possibly triggered by the eclipse phenomena. The increase in F-region base height immediately after the eclipse is explained as due to the reduction in the conductivity of the conjugate E-region in the path of totality connected to the F-region over the equator along the magnetic field lines, and this, with the peculiar local and regional conditions, seems to have reduced the E-region loading of the F-region dynamo, resulting in a larger post sunset F-region height (h' F) rise. These aspects of E-and F-region behaviour on the eclipse day are discussed in relation to those observed on the control day.Key words. Ionosphere (electric fields and currents; equatorial ionosphere; ionospheric irregularities)

Mass spectrometry in weakly ionized plasmas using a Gifford–McMahon cryocooled superconducting magnet

2002 ◽  
Vol 92 (11) ◽  
pp. 6423-6427 ◽  
Author(s):  
T. Murakami ◽  
T. Kaneko ◽  
J. Terashima ◽  
R. Hatakeyama ◽  
S. Murase ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Superconducting Magnet ◽  
Ionized Plasmas ◽  
Weakly Ionized

scholarly journals Regional estimation of electric fields and currents in the polar ionosphere

1995 ◽  
Vol 22 (3) ◽  
pp. 283-286 ◽  
Author(s):  
Mariko Sato ◽  
Y. Kamide ◽  
A. D. Richmond ◽  
A. Brekke ◽  
S. Nozawa
Keyword(s):  
Electric Fields ◽  
Polar Ionosphere ◽  
Regional Estimation ◽  
Electric Fields And Currents
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