Analysis of Thomson scattered light from an arc plasma jet

G. Gregori, U. Kortshagen, J. Heberlein, E. Pfender

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

In this paper we present an analysis of Thomson scattered light from an arc plasma jet. Our approach goes beyond the standard random-phase approximation (RPA) and provides more consistent data for the electron temperature and density in plasmas that are weakly nonideal and collisional. The theory is based on a memory function formalism for the spectral density function with the use of the three lowest-order frequency-moment sum rules. These moments are then corrected for temperature inhomogeneities in the scattering volume. The proposed interpretation of scattering data is compared with the RPA result and with the standard Bhatnagar-Gross-Krook collisional model for the dynamic structure factor. It is shown that the obtained electron temperature values are closer but not equal to local thermodynamic equilibrium temperature values extracted from spectroscopic measurements.

Original languageEnglish (US)
Article number046411
Number of pages1
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume65
Issue number4
DOIs
StatePublished - Apr 1 2002

Fingerprint

plasma jets
Arc of a curve
Plasma
arcs
electron energy
moments
local thermodynamic equilibrium
approximation
scattering
sum rules
inhomogeneity
Scattering
Electron
formalism
Moment
Spectral Density Function
Memory Function
Local Equilibrium
Thermodynamic Equilibrium
temperature

Cite this

Analysis of Thomson scattered light from an arc plasma jet. / Gregori, G.; Kortshagen, U.; Heberlein, J.; Pfender, E.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 65, No. 4, 046411, 01.04.2002.

Research output: Contribution to journalArticle

@article{002e32dc8b164972b73ab38cd861caab,
title = "Analysis of Thomson scattered light from an arc plasma jet",
abstract = "In this paper we present an analysis of Thomson scattered light from an arc plasma jet. Our approach goes beyond the standard random-phase approximation (RPA) and provides more consistent data for the electron temperature and density in plasmas that are weakly nonideal and collisional. The theory is based on a memory function formalism for the spectral density function with the use of the three lowest-order frequency-moment sum rules. These moments are then corrected for temperature inhomogeneities in the scattering volume. The proposed interpretation of scattering data is compared with the RPA result and with the standard Bhatnagar-Gross-Krook collisional model for the dynamic structure factor. It is shown that the obtained electron temperature values are closer but not equal to local thermodynamic equilibrium temperature values extracted from spectroscopic measurements.",
author = "G. Gregori and U. Kortshagen and J. Heberlein and E. Pfender",
year = "2002",
month = "4",
day = "1",
doi = "10.1103/PhysRevE.65.046411",
language = "English (US)",
volume = "65",
journal = "Physical Review E - Statistical, Nonlinear, and Soft Matter Physics",
issn = "1539-3755",
publisher = "American Physical Society",
number = "4",

}

TY - JOUR

T1 - Analysis of Thomson scattered light from an arc plasma jet

AU - Gregori, G.

AU - Kortshagen, U.

AU - Heberlein, J.

AU - Pfender, E.

PY - 2002/4/1

Y1 - 2002/4/1

N2 - In this paper we present an analysis of Thomson scattered light from an arc plasma jet. Our approach goes beyond the standard random-phase approximation (RPA) and provides more consistent data for the electron temperature and density in plasmas that are weakly nonideal and collisional. The theory is based on a memory function formalism for the spectral density function with the use of the three lowest-order frequency-moment sum rules. These moments are then corrected for temperature inhomogeneities in the scattering volume. The proposed interpretation of scattering data is compared with the RPA result and with the standard Bhatnagar-Gross-Krook collisional model for the dynamic structure factor. It is shown that the obtained electron temperature values are closer but not equal to local thermodynamic equilibrium temperature values extracted from spectroscopic measurements.

AB - In this paper we present an analysis of Thomson scattered light from an arc plasma jet. Our approach goes beyond the standard random-phase approximation (RPA) and provides more consistent data for the electron temperature and density in plasmas that are weakly nonideal and collisional. The theory is based on a memory function formalism for the spectral density function with the use of the three lowest-order frequency-moment sum rules. These moments are then corrected for temperature inhomogeneities in the scattering volume. The proposed interpretation of scattering data is compared with the RPA result and with the standard Bhatnagar-Gross-Krook collisional model for the dynamic structure factor. It is shown that the obtained electron temperature values are closer but not equal to local thermodynamic equilibrium temperature values extracted from spectroscopic measurements.

UR - http://www.scopus.com/inward/record.url?scp=41349086164&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=41349086164&partnerID=8YFLogxK

U2 - 10.1103/PhysRevE.65.046411

DO - 10.1103/PhysRevE.65.046411

M3 - Article

AN - SCOPUS:41349086164

VL - 65

JO - Physical Review E - Statistical, Nonlinear, and Soft Matter Physics

JF - Physical Review E - Statistical, Nonlinear, and Soft Matter Physics

SN - 1539-3755

IS - 4

M1 - 046411

ER -