Statistical approach to studying radiation from multicharged ions in a plasma under coronal equilibrium conditions

Journal Article · Sat Aug 15 00:00:00 EDT 2009 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X09080091· OSTI ID:21443687

Garanin, S F; Kravets, E M; Mamyshev, V I; Tokarev, V A ^[1]

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1. Russian Federal Nuclear Center, All-Russia Research Institute of Experimental Physics (Russian Federation)

Radiation spectra from a plasma with multicharged ions, z >> N >> 1(where z is the charge of an ion and N is the number of electrons in the ion) under coronal equilibrium conditions are considered in the quasiclassical approximation. In this case, the bremsstrahlung and recombination radiation can be described by simple quasiclassical formulas. The statistical model of an atom is used to study the high-frequency component of the line radiation spectra from ions ({h_bar}{omega} > I, where I is the ionization energy) that is produced in collisions of free plasma electrons with the electrons at deep levels of an ion and during radiative filling of the forming hole by electrons from higher levels (X-ray terms, characteristic radiation). The intensity of this high-frequency spectral component of the characteristic radiation coincides in order of magnitude with the bremsstrahlung and recombination radiation intensities. One of the channels of collisions of free electrons with a multicharged ion is considered that results in the excitation of the ion and in its subsequent radiative relaxation, which contributes to the low-frequency component of the line spectrum ({h_bar}{omega} < I). The total radiation intensity of this channel correlates fairly well with the results of calculating the radiation intensity from the multilevel coronal model. An analysis of the plasma behavior in the MAGO-IX experiment by two-dimensional MHD numerical simulations and a description of the experimental data from a DANTE spectrometer by the spectra obtained in this study shows that these experimental results cannot be explained if the D-T plasma is assumed to remain pure in the course of experiment. The agreement can be made better, how-ever, by assuming that the plasma is contaminated with impurities of copper and light elements from the wall.

• OSTI ID: 21443687
• Journal Information: Plasma Physics Reports, Vol. 35, Issue 8; Other Information: DOI: 10.1134/S1063780X09080091; Copyright (c) 2009 Pleiades Publishing, Ltd.; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BREMSSTRAHLUNG
COLLISIONS
COMPUTERIZED SIMULATION
ELECTRONS
MAGNETOHYDRODYNAMICS
MULTICHARGED IONS
PLASMA
RECOMBINATION
STATISTICAL MODELS
CHARGED PARTICLES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
FLUID MECHANICS
HYDRODYNAMICS
IONS
LEPTONS
MATHEMATICAL MODELS
MECHANICS
RADIATIONS
SIMULATION