Topics in Plasma Diagnostics

Podgornyi, I. M.

doi:10.1007/978-1-4684-0724-2

Cited by 21 publications

(12 citation statements)

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“…The double electric probe (DEP) is the most common probe type which has two identical isolated collectors with equal areas and draws no current from plasma, so it disturbs plasma only at its location [8] [9] [10]. From the slope of the IV characteristic curve of DEP as shown in Figure 2, kT e can be obtained, and then n i is evaluated by using the following equations [4] [11]:…”

Section: ( )mentioning

confidence: 99%

Characterization of a New DC-Glow Discharge Plasma Set-Up to Enhance the Electronic Circuits Performance

Talab¹,

Yahia²,

Saudy³

et al. 2020

JMP

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The (DC-GDPAU) is a DC glow discharge plasma experiment that was designed, established, and operated in the Physics Department at Ain Shams University (Egypt). The aim of this experiment is to study and improve some properties of a printed circuit board (PCB) by exposing it to the plasma. The device consists of cylindrical discharge chamber with movable parallel circular copper electrodes (cathode and anode) fixed inside it. The distance between them is 12 cm. This plasma experiment works in a low-pressure range (0.15-0.70 Torr) for Ar gas with a maximum DC power supply of 200 W. The Paschen curves and electrical plasma parameters (current, volt, power, resistance) characterized to the plasma have been measured and calculated at each cm between the two electrodes. Besides, the electron temperature and ion density are obtained at different radial distances using a double Langmuir probe. The electron temperature (KT e) was kept stable in range 6.58 to 10.44 eV; whereas the ion density (n i) was in range from 0.91 × 10 10 cm −3 to 1.79 × 10 10 cm −3. A digital optical microscope (800×) was employed to draw a comparison between the pre-and after effect of exposure to plasma on the shaping of the circuit layout. The experimental results show that the electrical conductivity increased after plasma exposure, also an improvement in the adhesion force in the Cu foil surface. A significant increase in the conductivity can be directly related to the position of the sample surfaces as well as to the time of exposure. This shows the importance of the obtained results in developing the PCBs manufacturing that uses in different microelectronics devices like those onboard of space vehicles.

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Section: ( )mentioning

confidence: 99%

Characterization of a New DC-Glow Discharge Plasma Set-Up to Enhance the Electronic Circuits Performance

Talab¹,

Yahia²,

Saudy³

et al. 2020

JMP

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“…Relaxation of excited argon atoms by wall collisions [41]. The energy loss is at least 11.56 eV and is determined by the thermal flux to the wall, hence 47) where N Ar * is the density of excited argon atoms, and wherein the average thermal velocity, υ Ar * , is determined by equation (33). Again, a relaxation probability of one is assumed.…”

Section: Energy Transfermentioning

confidence: 99%

“…However, the rate constant for radiative recombination was calculated above to be insignificant. Radiative transitions between Ar + levels do appear but densities and hence peak intensities are typically much lower than intensities of excited argon levels [47][48][49]. Thus, radiative relaxation is the main source of radiation, and P rad can be calculated from equation (3.49).…”

Section: Energy Transfermentioning

confidence: 99%

“…There have been several attempts to use OES to measure kT e or EEDF. The general approach is to compare relative intensities of emission lines that have different excitation energies [39,[47][48][49][124][125][126][127][128][129]. Typically, two emission lines are compared, and the EEDF is assumed to be Maxwellian: 27) where I ij and I ab are the intensities of emission lines assigned to transitions i → j, and a → b, while ν ij , ν ab , and E 1 and E 2 are their corresponding frequencies and onset energies, respectively.…”

Section: Line Ratiosmentioning

confidence: 99%

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Plasma-enhanced chemical vapor deposition of silicon dioxide

Boogaard¹

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“…• Plasma diagnostics is a field devoted to devising, developing and proving techniques for measuring the properties of plasmas [65,108]. To deduce information about the state of the plasma from practical observations of physical processes and their effect, it requires a profound understanding of the physical processes involved.…”

Section: Introductionmentioning

confidence: 99%

Low Work-Function Thermionic Emission and Orbital-Motion-Limited Ion Collection at Bare-Tether Cathodic Contact

Chen¹

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An electrodynamic tether operates on electromagnetic principles and exchanges momentum through the planetary magnetosphere, by continuously interacting with the ionosphere. It is a reliable passive subsystem to deorbit spent rocket stages and satellites at its end of mission, mitigating the growth of orbital debris. A tether left bare of insulation collects electrons by its own uninsulated and positively biased segment with kilometer range, while electrons are emitted by a low-impedance active device at the cathodic end, such as a hollow cathode, to emit the full electron current.In the absence of an active cathodic device, the current flowing along an orbiting bare tether vanishes at both ends and the tether is said to be electrically floating. For negligible thermionic emission and orbital-motion-limited (OML) collection throughout the entire tether (electron/ion collection at anodic/cathodic segment, respectively), the anodic-to-cathodic length ratio is very small due to ions being much heavier, which results in low average current and Lorentz drag.The electride C12A7 : e − , which might present a possible work function as low as W = 0.6 eV and moderately high temperature stability, has been proposed as coating for floating bare tethers. Thermionic emission along a thus coated cathodic segment, under heating in space operation, can be more efficient than ion collection and, in the simplest drag mode, may eliminate the need for an active cathodic device and its corresponding gas-feed requirements and power subsystem, which would result in a truly "propellant-less" tether system.With this low-W coating, each elemental segment on the cathodic segment of a kilometers-long floating bare-tether would emit current as if it were part of a hot cylindrical probe uniformly polarized at the local tether bias, under 2D probe conditions that are also applied to the anodic-segment analysis. In the presence of emission, emitted electrons result in negative space charge, which decreases the electric field that accelerates them outwards, or even reverses it, decelerating electrons near the emitting probe. A double sheath would be established with electrons being emitted from the probe and ions coming from the ambient plasma. The thermionic current density, varying along the cathodic segment, might follow two distinct laws under different convii

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Topics in Plasma Diagnostics

Cited by 21 publications

References 0 publications

Characterization of a New DC-Glow Discharge Plasma Set-Up to Enhance the Electronic Circuits Performance

Characterization of a New DC-Glow Discharge Plasma Set-Up to Enhance the Electronic Circuits Performance

Plasma-enhanced chemical vapor deposition of silicon dioxide

Low Work-Function Thermionic Emission and Orbital-Motion-Limited Ion Collection at Bare-Tether Cathodic Contact

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