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367 results on '"Rosato, J."'

129. Modeling of Line Shapes using Continuous Time Random Walk Theory

Author

Capes, H., primary, Christova, M., additional, Boland, D., additional, Bouzaher, A., additional, Catoire, F., additional, Godbert-Mouret, L., additional, Koubiti, M., additional, Mekkaoui, S., additional, Rosato, J., additional, Marandet, Y., additional, Stamm, R., additional, Todorov, Michail D., additional, and Christov, Christo I., additional

Published
2010
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138. The effect of time ordering revisited

Author

Rosato, J., primary, Boland, D., additional, Capes, H., additional, Marandet, Y., additional, Stamm, R., additional, Gigosos, Marco Antonio, additional, and González, Manuel Ángel, additional

Published
2008
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139. Emission spectroscopy of hydrogen lines in magnetized plasmas: Application to PSI studies under conditions foreseen in ITER

Author

Ferri, S., primary, Rosato, J., additional, Marandet, Y., additional, Godbert-Mouret, L., additional, Koubiti, M., additional, Stamm, R., additional, Shumack, A. E., additional, Westerhout, J., additional, Rapp, J., additional, van Rooij, G. J., additional, Gigosos, Marco Antonio, additional, and González, Manuel Ángel, additional

Published
2008
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146. Effects of Turbulent Temperature Fluctuations on the Core of Doppler Line Shapes.

Author

Rosato, J., Capes, H., Godbert-Mouret, L., Koubiti, M., Marandet, Y., Rosmej, F., and Stamm, R.

Subjects
*PLASMA turbulence, *PLASMA gases, *TEMPERATURE, *DOPPLER effect, *TURBULENCE, *IONS
Abstract

In this work, the influence of the turbulent plasma temperature fluctuations brought on the Hα Doppler line shape is investigated. We show that the core of the line profile is modified by the plasma turbulence. The consequences on the ion temperature determination from Doppler line profile analysis are discussed. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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147. Effect Of Fine Structure On The Accuracy Of A Spectroscopic Plasma Diagnostic.

Author

Godbert-Mouret, L., Capes, H., Koubiti, M., Marandet, Y., Rosato, J., and Stamm, R.

Subjects
PLASMA diagnostics, SPECTRUM analysis, PLASMA gases, PARTICLES (Nuclear physics), INDUSTRIAL contamination
Abstract

In this work we analyze the role played by fine structure in the modeling of spectral line shape. In the case of non hydrogenic impurities, fine structure obviously cannot be neglected since the corresponding components are often resolved. This is generally not the case for hydrogenic lines, which have larger Doppler widths. Nevertheless, we show that in some tokamak plasmas conditions fine structure must be taken into account so as to ensure accurate line width measurements. We present a numerical code developed by our group, which is able to calculate line shapes emitted by any kind of atoms perturbed by electric and magnetic fields. Magnetic field effects on fine structure spectra of both impurities and deuterium are investigated for tokamak edge conditions, i.e. for emitter temperature varying from a fraction of eV to a few tens of eV, and for magnetic field in the range of 0–5 teslas. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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148. Stark broadening of low-[formula omitted] hydrogen lines in strongly magnetized hydrogen plasmas: Influence of [formula omitted]-degeneracy removal due to the quadratic Zeeman effect.

Author

Rosato, J.

Subjects
*ZEEMAN effect, *HYDROGEN plasmas, *MAGNETIC fields, *HYDROGEN, *COMPUTER simulation
Abstract

• The Stark broadening of hydrogen lines is reexamined in the case of plasmas subject to a large external magnetic field. • It is shown that the energy degeneracy removal due to the diamagnetic Zeeman effect strongly affect the line broadening. • Computer simulations of Lyman and Balmer line shapes in white dwarf atmosphere conditions are performed as an illustration. The Stark broadening of hydrogen lines with a low upper principal quantum number n is reexamined in the case of plasmas subject to a large (≳ 1 kT) external magnetic field. This investigation has been motivated by the observation of strong Zeeman splitting in a significant number of white dwarf spectra. The diamagnetic Zeeman effect term present in the Hamiltonian removes the degeneracy of the energy levels in orbital quantum number l , which results in an alteration of the Stark perturbation due to the microfield. In this work, we investigate this effect by applying a computer simulation method designed for Stark broadening modeling. A focus is put on the Lyman α and H- α lines. Based on line shape calculations, we show that the width of the Zeeman components is strongly dependent on the magnetic field. [ABSTRACT FROM AUTHOR]

Published
2022
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150. Collision operators for Stark line shapes: When does the unified theory fail?

Author

Rosato, J., Capes, H., and Stamm, R.

Abstract

Abstract: It is shown that the unified theory for Stark broadening leads to incorrect results when correlated emitter–perturber collisions are present. With a kinetic theory treatment, we propose an extension of the model able to account for such correlations. The treatment presents analogies with renormalization techniques and the resulting collision operator has a structure similar to that obtained within the unified theory. We illustrate the applicability of the model through calculations of hydrogen line shapes in ideal cases. [Copyright &y& Elsevier]

Published
2013
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