Electron transport parameters in CO2: Scanning drift tube measurements and kinetic computations

M. Vass, I. Korolov, D. Loffhagen, N. Pinhão, Z. Donkó

Research output: Article

7 Citations (Scopus)

Abstract

This work presents the transport coefficients of electrons (bulk drift velocity, longitudinal diffusion coefficient, and effective ionization frequency) in CO2 measured under time-of-flight conditions over a wide range of the reduced electric field, 15 Td ≤ E N ≤ 2660 Td, in a scanning drift tube apparatus. The data obtained in the experiments are also applied to determine the effective steady-state Townsend ionization coefficient. These parameters are compared to the results of previous experimental studies, as well as to the results of various kinetic computations: solutions of the electron Boltzmann equation under different approximations (multiterm and density gradient expansions) and Monte Carlo simulations. The experimental data extend the range of E/N compared with previous measurements and are consistent with most of the transport parameters obtained in these earlier studies. The computational results point out the range of applicability of the respective approaches to determine the different measured transport properties of electrons in CO2. They also demonstrate the need for further improvement of the electron collision cross section data for CO2 taking into account the present experimental data.

Original languageEnglish
Article number065007
JournalPlasma Sources Science and Technology
Volume26
Issue number6
DOIs
Publication statusPublished - máj. 5 2017

Fingerprint

tubes
scanning
kinetics
ionization frequencies
transport properties
flight conditions
ionization coefficients
electrons
electron scattering
diffusion coefficient
gradients
expansion
electric fields
cross sections
approximation
simulation

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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title = "Electron transport parameters in CO2: Scanning drift tube measurements and kinetic computations",
abstract = "This work presents the transport coefficients of electrons (bulk drift velocity, longitudinal diffusion coefficient, and effective ionization frequency) in CO2 measured under time-of-flight conditions over a wide range of the reduced electric field, 15 Td ≤ E N ≤ 2660 Td, in a scanning drift tube apparatus. The data obtained in the experiments are also applied to determine the effective steady-state Townsend ionization coefficient. These parameters are compared to the results of previous experimental studies, as well as to the results of various kinetic computations: solutions of the electron Boltzmann equation under different approximations (multiterm and density gradient expansions) and Monte Carlo simulations. The experimental data extend the range of E/N compared with previous measurements and are consistent with most of the transport parameters obtained in these earlier studies. The computational results point out the range of applicability of the respective approaches to determine the different measured transport properties of electrons in CO2. They also demonstrate the need for further improvement of the electron collision cross section data for CO2 taking into account the present experimental data.",
keywords = "Drift tube measurements, Electron transport coefficients, Kinetic theory and computations",
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TY - JOUR

T1 - Electron transport parameters in CO2

T2 - Scanning drift tube measurements and kinetic computations

AU - Vass, M.

AU - Korolov, I.

AU - Loffhagen, D.

AU - Pinhão, N.

AU - Donkó, Z.

PY - 2017/5/5

Y1 - 2017/5/5

N2 - This work presents the transport coefficients of electrons (bulk drift velocity, longitudinal diffusion coefficient, and effective ionization frequency) in CO2 measured under time-of-flight conditions over a wide range of the reduced electric field, 15 Td ≤ E N ≤ 2660 Td, in a scanning drift tube apparatus. The data obtained in the experiments are also applied to determine the effective steady-state Townsend ionization coefficient. These parameters are compared to the results of previous experimental studies, as well as to the results of various kinetic computations: solutions of the electron Boltzmann equation under different approximations (multiterm and density gradient expansions) and Monte Carlo simulations. The experimental data extend the range of E/N compared with previous measurements and are consistent with most of the transport parameters obtained in these earlier studies. The computational results point out the range of applicability of the respective approaches to determine the different measured transport properties of electrons in CO2. They also demonstrate the need for further improvement of the electron collision cross section data for CO2 taking into account the present experimental data.

AB - This work presents the transport coefficients of electrons (bulk drift velocity, longitudinal diffusion coefficient, and effective ionization frequency) in CO2 measured under time-of-flight conditions over a wide range of the reduced electric field, 15 Td ≤ E N ≤ 2660 Td, in a scanning drift tube apparatus. The data obtained in the experiments are also applied to determine the effective steady-state Townsend ionization coefficient. These parameters are compared to the results of previous experimental studies, as well as to the results of various kinetic computations: solutions of the electron Boltzmann equation under different approximations (multiterm and density gradient expansions) and Monte Carlo simulations. The experimental data extend the range of E/N compared with previous measurements and are consistent with most of the transport parameters obtained in these earlier studies. The computational results point out the range of applicability of the respective approaches to determine the different measured transport properties of electrons in CO2. They also demonstrate the need for further improvement of the electron collision cross section data for CO2 taking into account the present experimental data.

KW - Drift tube measurements

KW - Electron transport coefficients

KW - Kinetic theory and computations

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