Kinetic simulation of a nanosecond-pulsed hydrogen microdischarge

Schulze, Julian; Muller, Stella Torres; Czarnetzki, Uwe

doi:10.1063/1.3601486

Cited by 20 publications

(16 citation statements)

References 15 publications

(16 reference statements)

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“…Finally, after breakdown the field in the quasi-steady-state plasma remains lower compared to the applied field because of cathode layer formation and cathode voltage fall. This behavior was reproduced by kinetic modeling of the discharge dynamics using a Particle-in-Cell / Monte Carlo model [81].…”

Section: Cars / 4-wave Mixing: Electric Field In Pulsed Plasmasmentioning

confidence: 96%

Coherent anti-Stokes Raman scattering and spontaneous Raman scattering diagnostics of nonequilibrium plasmas and flows

Lempert

Adamovich

2014

J. Phys. D: Appl. Phys.

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The paper provides an overview of the use of coherent anti-Stokes Raman scattering (CARS) and spontaneous Raman scattering for diagnostics of low-temperature nonequilibrium plasmas and nonequilibrium high-enthalpy flows. A brief review of the theoretical background of CARS, four-wave mixing and Raman scattering, as well as a discussion of experimental techniques and data reduction, are included. The experimental results reviewed include measurements of vibrational level populations, rotational/translational temperature, electric fields in a quasi-steady-state and transient molecular plasmas and afterglow, in nonequilibrium expansion flows, and behind strong shock waves. Insight into the kinetics of vibrational energy transfer, energy thermalization mechanisms and dynamics of the pulse discharge development, provided by these experiments, is discussed. Availability of short pulse duration, high peak power lasers, as well as broadband dye lasers, makes possible the use of these diagnostics at relatively low pressures, potentially with a sub-nanosecond time resolution, as well as obtaining single laser shot, high signal-to-noise spectra at higher pressures. Possibilities for the development of single-shot 2D CARS imaging and spectroscopy, using picosecond and femtosecond lasers, as well as novel phase matching and detection techniques, are discussed. 45 I 2

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Section: Cars / 4-wave Mixing: Electric Field In Pulsed Plasmasmentioning

confidence: 96%

Coherent anti-Stokes Raman scattering and spontaneous Raman scattering diagnostics of nonequilibrium plasmas and flows

Lempert

Adamovich

2014

J. Phys. D: Appl. Phys.

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“…Nonetheless, particlebased kinetic approaches, like the Particle-in-Cell method complemented with Monte Carlo Collisions (PIC/MCC), have also been applied in some studies, despite the high computational requirements, because they can describe non-local kinetic effects in domains with high reduced electric field and they provide access to the electron energy distribution function. Such studies include, e.g., those of fast (subnanosecond) breakdown in high-voltage open discharges [12,13] and of the discharge development in hydrogen micordischarges [14][15][16], as well as ionisation instabilities [17] and selforganised pattern formation [18]. The ultraviolet (UV) / vacuum-ultraviolet (VUV) radiation of the plasma plays an important role in various applications.…”

Section: Introductionmentioning

confidence: 99%

The effect of photoemission on nanosecond helium microdischarges at atmospheric pressure

Hamaguchi

Gans

2018

Plasma Sources Sci. Technol.

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Atmospheric-pressure microdischarges excited by nanosecond highvoltage pulses are investigated in helium-nitrogen mixtures by first-principles particlebased simulations that include VUV resonance radiation transport via tracing photon trajectories. The VUV photons, of which the frequency redistribution in emission processes is included in some detail, are found to modify remarkably the computed discharge characteristics due to their ability to induce electron emission from the cathode surface. The electrons created this way enhance the plasma density and a significant increase of the transient current pulse amplitude is observed. The simulations allow the computation of the density of helium atoms in the 2 1 P resonant state, as well as the density of photons in the plasma and the line shape of the resonant VUV radiation reaching the electrodes. These indicate the presence of significant radiation trapping in the plasma and photon escape times longer than the duration of the excitation pulses are found.

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“…Kimura et al studied hydrogen inductively coupled plasmas (ICP) and obtained the H-atom density in fair agreement with actinometric measurements. Lo and Hamaguchi [69] and Donkó et al [70] studied pulsed nanosecond high pressure hydrogen microdischarges using PIC/MCC. Under the highpressure conditions they assumed that the H + 2 ions were converted effectively to H + 3 and used a simplified chemistry with only one ionic species (i.e.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Hybrid simulation of a dc-enhanced radio-frequency capacitive discharge in hydrogen

Diomede¹,

Longo²,

Economou³

et al. 2012

J. Phys. D: Appl. Phys.

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A PIC-MCC/fluid hybrid model was employed to study a parallel-plate capacitively coupled radio-frequency discharge in hydrogen, under the application of a dc bias voltage. When a negative dc voltage was applied to one of the electrodes of a continuous wave (cw) plasma, a 'beam' of secondary electrons was formed that struck the substrate counter-electrode at nearly normal incidence. The energy distribution of the electrons striking the substrate extended all the way to V RF + |V dc |, the sum of the peak RF voltage and the absolute value of the applied dc bias. Such directional, energetic electrons may be useful for ameliorating charging damage in etching of high aspect ratio nano-features. The vibrational distribution function of molecular hydrogen was calculated self-consistently, and was found to have a characteristic plateau for intermediate values of the vibrational quantum number, v. When a positive dc bias voltage was applied synchronously during a specified time window in the afterglow of a pulsed plasma, the ion energy distributions (IEDs) of positive ions acquired an extra peak at an energy equivalent of the applied dc voltage. The electron energy distribution function was slightly and temporarily heated during the application of the dc bias pulse. The calculated IEDs of H + 3 and H + 2 ions in a cw plasma without dc bias were found to be in good agreement with published experimental data.

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Kinetic simulation of a nanosecond-pulsed hydrogen microdischarge

Cited by 20 publications

References 15 publications

Coherent anti-Stokes Raman scattering and spontaneous Raman scattering diagnostics of nonequilibrium plasmas and flows

Coherent anti-Stokes Raman scattering and spontaneous Raman scattering diagnostics of nonequilibrium plasmas and flows

The effect of photoemission on nanosecond helium microdischarges at atmospheric pressure

Hybrid simulation of a dc-enhanced radio-frequency capacitive discharge in hydrogen

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