Evolution of the electron energy distribution function during genesis of breakdown plasma

Bhattacharjee, Sudeep; Paul, Samit; Ghosh, Sayandip

doi:10.1063/1.4891654

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…where T e (r) is the spatially varying electron temperature in the plasmas in Exp 1 and Exp 2, measured in previous experiments [4,9]. We consider the Maxwellian EEDF to be a good first approximation, especially in the region r 10 cm (which is the location of primary interest) since the deviation from the normalized measured EEDFs (determined by the Druyvesteyn technique [33] in Exp 2) appear to give a residual sum of squares value [34] within 0.3. The optical cross-sections for these transitions from the ground state were obtained from [31].…”

Section: Inversion Algorithmsmentioning

confidence: 99%

Characterizing spatially varying optical emissions in a steady-state dipole plasma: inversion based experiments and modeling

Bhattacharjee¹,

Baitha²,

Mathew³

et al. 2021

Phys. Scr.

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This study characterizes spatially varying optical emissions in a compact dipole plasma device driven at steady-state by continuous mode microwaves. The study is motivated by visual observations, which indicate a distinct pattern of alternate bright and less bright regions (bearing structural resemblance to the two particle radiation belts found in the Earth's magnetosphere). The investigation is performed in two experimental systems of cylindrical and spherical geometries, and boundary effects in the optical emissivity are observed in the smaller cylindrical system. Two optical diagnostic techniques are employed, namely, a simplistic linear inversion method, and the standard Abel inversion method, to invert the measured intensities and determine the local (spatially varying) emissivities in the equatorial plane of the dipole plasma. The study involves the design and development of the two optical probes, specifically, a telescopic probe capable of motion along a radial line (for linear inversion), and a mechanical gear-operated probe capable of bidirectional motion to obtain chord integrated intensities (for Abel inversion). Finally, the transition specific photon emission rates are determined by the application of a modified corona model, and the emission rates are compared with the experimental results. The existence of two bright belts separated by a darker band in the dipole plasma is confirmed by both the experimental and modeling results.

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Section: Inversion Algorithmsmentioning

confidence: 99%

Characterizing spatially varying optical emissions in a steady-state dipole plasma: inversion based experiments and modeling

Bhattacharjee¹,

Baitha²,

Mathew³

et al. 2021

Phys. Scr.

Self Cite

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“…Ignition and reaction chemistry involving excitation, dissociation, and ionization of these molecules in combustion (plasma) processes in automobile engines [3] is governed or catalyzed by energetic electron scattering from these fuel species in the energy region which ranges from 0.1 eV to high energies (>100 eV), but with a maximum around 10 eV [4]. Whereas there exist electron impact data on methane [5][6][7], ethane [8,9], propane [10][11][12], and butane [13], and in references cited within these, there is lack of electron collision data for pentane.…”

Section: Introductionmentioning

confidence: 99%

Differential elastic electron scattering by pentane

et al. 2015

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We report measurements and calculations of the differential cross sections for elastic scattering of low-energy electrons by pentane, C 5 H 12 . The incident energies measured are at 1, 1.5, 2, 3, 5, 10, 15, 20, 30, 50, and 100 eV, and the calculations covered energies up to 100 eV. The range of experimental scattering angles is from 5°to 130°. We compare our experimental and theoretical values to each other and to available experimental and theoretical data for linear n-alkanes.

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“…Georgieva et al observed that plasma electronegativity varies depending on a gas composition in a capacitively coupled Ar/CF 4 discharge using a one-dimensional PIC simulation [18]. Bhattacharjee et al investigated the breakdown electric field and EEPFs in a magnetized plasma using zero-dimensional Monte Carlo simulation [19,20].…”

Section: Introductionmentioning

confidence: 99%

Advanced PIC-MCC simulation for the investigation of step-ionization effect in intermediate-pressure capacitively coupled plasmas

Kim

Hur

Kim

et al. 2018

J. Phys. D: Appl. Phys.

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A two-dimensional parallelized particle-in-cell simulation has been developed to simulate a capacitively coupled plasma reactor. The parallelization using graphics processing units is applied to resolve the heavy computational load. It is found that the step-ionization plays an important role in the intermediate gas pressure of a few Torr. Without the step-ionization, the average electron density decreases while the effective electron temperature increases with the increase of gas pressure at a fixed power. With the step-ionization, however, the average electron density increases while the effective electron temperature decreases with the increase of gas pressure. The cases with the step-ionization agree well with the tendency of experimental measurement. The electron energy distribution functions show that the population of electrons having intermediate energy from 4.2 to 12 eV is relaxed by the step-ionization. Also, it was observed that the power consumption by the electrons is increasing with the increase of gas pressure by the step-ionization process, while the power consumption by the ions decreases with the increase of gas pressure.

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Evolution of the electron energy distribution function during genesis of breakdown plasma

Cited by 3 publications

References 18 publications

Characterizing spatially varying optical emissions in a steady-state dipole plasma: inversion based experiments and modeling

Characterizing spatially varying optical emissions in a steady-state dipole plasma: inversion based experiments and modeling

Differential elastic electron scattering by pentane

Advanced PIC-MCC simulation for the investigation of step-ionization effect in intermediate-pressure capacitively coupled plasmas

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