Spatially and temporally resolved optical spectroscopic investigations inside a self-pulsing micro thin-cathode discharge

Du, Beilei; Aramaki, Mitsutoshi; Mohr, Sebastian; Çelik, Yusuf; Luggenhölscher, Dirk; Czarnetzki, Uwe

doi:10.1088/0022-3727/44/25/252001

Cited by 4 publications

(4 citation statements)

References 8 publications

(12 reference statements)

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“…The model indicates that the long living afterglow is a result of the high population density of the excited states, especially the metastable 1s states, the formation of excimers and the high gas temperature, which effectively results in a low recombination rate. The population density of the Ar 1s 5 state was determined from tunable diode laser absorption spectroscopic (TDLAS) measurements using an optical fiber probe [12]. Quantitative agreement with the simulation results was obtained.…”

Section: Introductionmentioning

confidence: 69%

Temporally resolved optical emission spectroscopic investigations on a nanosecond self-pulsing micro-thin-cathode discharge

Du¹,

Sadeghi²,

Tsankov³

et al. 2012

Plasma Sources Sci. Technol.

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At atmospheric pressure in Ar, a micro-thin-cathode discharge operates in a self-pulsing mode due to periodic ignition of a nanosecond spark discharge with a long living afterglow (several hundred nanoseconds). In this mode, optical emission spectra of the nanosecond spark and the afterglow are investigated. The electron density and temperature in the pure Ar discharge are measured by the Stark broadening and shift of the Ar 3p 6 → 1s 5 transition (415.859 nm). The nanosecond spark has an electron density of the order of 10 17 cm −3 and an electron temperature of 5 eV. The gas temperature is obtained by analyzing the emission spectra of the N 2 second positive system with an admixture of 0.5% N 2 . The measured gas temperature agrees very well with the result of a zero-dimensional kinetic simulation. The temporal development of the spatial distribution of separate emission lines shows that not only the nanosecond spark but the afterglow is also strongly localized. The temporal development of the emission spectrum provides powerful proof that the nanosecond spark discharge, due to thermionic emission, occurs in the self-pulsing mode with nanosecond current peaks.

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Section: Introductionmentioning

confidence: 69%

Temporally resolved optical emission spectroscopic investigations on a nanosecond self-pulsing micro-thin-cathode discharge

Du¹,

Sadeghi²,

Tsankov³

et al. 2012

Plasma Sources Sci. Technol.

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“…Several types of electrode configurations have been developed and a wide variety of phenomena ͑e.g., self-pulsing and mode transitions͒ have been studied. [1][2][3] Despite the small size of these devices, state-ofthe-art diagnostics methods have been applied to reveal details of discharge operation. [4][5][6][7][8][9][10][11] In microdischarges excited by nanosecond pulses, transient electron dynamics takes place on a nano-or subnanosecond time scale.…”

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confidence: 99%

Kinetic simulation of a nanosecond-pulsed hydrogen microdischarge

Schulze

Muller

Czarnetzki

2011

Applied Physics Letters

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The electron dynamics in a nanosecond-pulsed microdischarge in high pressure hydrogen gas is investigated space and time resolved by particle-in-cell simulations. The discharge is driven by a 10 ns voltage pulse with a peak of 1.3 kV followed by an approximately constant voltage of 300 V during 150 ns. The time resolved current, electric field, electron density, and spatio-temporal excitation rates are compared to experimental and modeling results under identical discharge conditions. Via this synergistic approach, the development of the discharge and the different phases of distinct electron dynamics are identified and understood.

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“…10,12) Optical diagnostics for the system will be available for small plasma sources. 19,[25][26][27][28][29][30][31][32] 0.0 z (mm)…”

Section: Discussionmentioning

confidence: 99%

Effect of local gas heating on a plasma structure driven at radio frequency in a microcell in Ar at atmospheric pressure

Yamasaki

Yagisawa

Makabe

2014

Jpn. J. Appl. Phys.

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In a microplasma in Ar confined at atmospheric pressure, driven at 13.56 MHz, we theoretically investigate the whole structure of a low-temperature plasma including the local distribution in gas temperature inside and outside a microcell. The governing equation of gas and wall temperature is combined with our original relaxation continuum model of an rf plasma. We demonstrate that electrons with intermediate energy play an important role in plasma production through stepwise ionization and metastable pooling in the presence of high-density metastables. Next, we examine the enhancement of the net ionization rate through the increase in the local reduced field under a broad minimum of the heated gas density. The atmospheric-pressure microcell plasma will be classified into a new spatiotemporal sustaining mechanism in the capacitively coupled plasma at 13.56 MHz. This work predicts the presence of a nonequilibrium, steady plasma in a microcell even at atmospheric pressure in Ar under appropriate conditions.

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Spatially and temporally resolved optical spectroscopic investigations inside a self-pulsing micro thin-cathode discharge

Abstract: , et al.. Spatially and temporally resolved optical spectroscopic investigations inside a self-pulsing micro thincathode discharge.

Cited by 4 publications

References 8 publications

Temporally resolved optical emission spectroscopic investigations on a nanosecond self-pulsing micro-thin-cathode discharge

Temporally resolved optical emission spectroscopic investigations on a nanosecond self-pulsing micro-thin-cathode discharge

Kinetic simulation of a nanosecond-pulsed hydrogen microdischarge

Effect of local gas heating on a plasma structure driven at radio frequency in a microcell in Ar at atmospheric pressure

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