An Investigation of Non-Equilibrium Effects in Thermal Argon Plasmas

Timmermans, CJ; Rosado, RJ; Schram, DC Daan

doi:10.1515/zna-1985-0804

Cited by 36 publications

(6 citation statements)

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“…Historically one of the first pulsed plasma experiments based on a wall-stabilized source was presented in [13,14], albeit with slightly different conditions than those described here: both the pressure and current were pulsed and varied in a range 1.6-14 bar, 60-2200 A, respectively. The duration of the pulse was 2-5 ms; this yielded T e = 2-3 eV, n e = 10 24 m −3 .…”

Section: Pulse Mode Without Magnetic Fieldmentioning

confidence: 99%

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Characterization of a high-power/current pulsed magnetized arc discharge

Zielinski

Meiden

Morgan

et al. 2012

Plasma Sources Sci. Technol.

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A high-power pulsed magnetized arc discharge has been developed to allow the superimposition of a dc plasma and a high-power plasma impulse with a single plasma source. A capacitor bank (8400 µF) is parallel-coupled to the current regulated power supply. The current is transiently increased from its stationary value (200 A) up to 14.5 kA in 650 µs. The discharge power is thus raised from 18 kW to 6.5 MW, corresponding to a power density of up to 1.7 × 10 12 W m −3 -10 2 times higher than in the dc mode (200 A). The plasma parameters are measured by Thomson scattering ∼4 cm downstream of the nozzle. The electron temperature and density vary from ∼2.6 eV and 7 × 10 20 m −3 in dc and up to 15 eV and 80 × 10 20 m −3 during the pulse. A saturation of the electron density with increasing current is observed while the temperature increases monotonically. Time-resolved voltage/current measurements of the arc are used to explain the role of the magnetic field and the evolution of the temperature.

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Section: Pulse Mode Without Magnetic Fieldmentioning

confidence: 99%

“…Dc arc discharge sources have been used as very efficient sources of dense plasma with moderate temperatures for more than 50 years [11][12][13]. A high-pressure pulsed argon arc discharge was previously described by Timmermans [14].…”

Section: Introductionmentioning

confidence: 99%

Characterization of a high-power/current pulsed magnetized arc discharge

Zielinski

Meiden

Morgan

et al. 2012

Plasma Sources Sci. Technol.

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“…w = ρ −1 j n j m j w j , where the summation is taken over all the species, j = e, i, a. The ambipolar diffusion coefficient, D amb , is taken from Timmermans [8]. The right-hand side represents the particle production and destruction due to interaction with other particles and due to radiative processes [7,9].…”

Section: The Hydrodynamic Modelmentioning

confidence: 99%

Ionization efficiency in a geometrically pinched cascaded arc

Burm

Goedheer

Mullen

et al. 1998

Plasma Sources Sci. Technol.

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Remote deposition allows separate optimization of the plasma production source and of the deposition process. To improve the ionization performance of the source, an argon cascaded arc plasma is studied by simulations. Improvements of the source performance in ion yield are achieved by constricting the bore of the arc channel near the entrance. Such a geometrical pinch construction leads to a higher neutral density at the arc inlet which results in increased ionization in the cascaded arc. The improved ionization performance is analysed by solving numerically the conservation laws of mass, momentum and energy in a two-dimensional hydrodynamic approximation using a pressure linked algorithm. The results are compared with those of a simplified one-dimensional formulation in order to identify the main mechanisms. The results indicate that, by constricting the bore of the arc channel, a very high ionization degree can be obtained.

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“…To show the quality of the calculated electron density, a comparison is made with the electron density profile in a straight arc channel, as measured by Timmermans et al [33].…”

Section: Methodsmentioning

confidence: 99%

A new design of a bright cascaded arc light source: measurements and simulations

Zijlmans¹,

Schram²,

Engeln³

2007

J. Phys. D: Appl. Phys.

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Profiling the arc channel of a cascaded arc into an hourglass-like shape results in an extremely high light output intensity (3.5 × 1012 Wm−2 m−1 sr−1 in the near-infrared) at an input power of 2.2 kW, a good stability (better than 5 × 10−4) and a small solid angle of the emitted light beam (Ω = 0.015 sr). These optical properties are advantageous for spectroscopic applications that require a high light intensity over a broad wavelength range in a small solid angle. The absolute light output is measured and is compared with a fast and flexible modelling scheme. These simulations are used to verify the arc performance and to guide arc design. The calculated emitted radiance at moderate arc input power agrees with the experiments within 30% for moderate input power.

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An Investigation of Non-Equilibrium Effects in Thermal Argon Plasmas

Cited by 36 publications

References 0 publications

Characterization of a high-power/current pulsed magnetized arc discharge

Characterization of a high-power/current pulsed magnetized arc discharge

Ionization efficiency in a geometrically pinched cascaded arc

A new design of a bright cascaded arc light source: measurements and simulations

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