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Non-equilibrium Processes in Plasma


Atomic and Radiative Processes in Plasma, Gases and Solids: Non - Equilibrium Nonlinear Spectroscopy in Dense Gases and Plasma

Tech Area / Field

  • PHY-PLS/Plasma Physics/Physics

3 Approved without Funding

Registration date

Leading Institute
TRINITI, Russia, Moscow reg., Troitsk

Supporting institutes

  • VNIITF, Russia, Chelyabinsk reg., Snezhinsk\nVNIIEF, Russia, N. Novgorod reg., Sarov


  • Lawrence Livermore National Laboratory / University of California, USA, CA, Livermore\nPittsburgh University, USA, PA, Pittsburgh\nURA 0073/Universite Paris-Sud / Laboratoire de Spectroscopie Atomique et Ionique(LSAI), France, Orsay

Project summary

The objective of the project proposed is to develop new theoretical models of the formation of line radiation spectra, as well as to experimentally test the models under the conditions of laboratory plasmas and dense gaseous media.

This project will be a logical continuation of ISTC Project #076 "Atomic and radiative processes in plasmas, gases and solids", with the same list of participant weapon centers and principal contributors. The project will employ equipment already purchased under Project #076. In the course of the new project, the basic results of Project #076 will be used, with their further development and improvement.

The kinetic models are to be developed for the description of the spectra of spontaneous and stimulated line radiation, including resonance line satellites, and resonance radiation redistribution functions, accounting for non-equilibrium state of matter and radiation, as well as stochastic plasma microfields. The results on line broadening and photon redistribution functions, with nonlinear interference effects, are to be used in developing the theory of radiation transfer in optically thick media. Practically unexplored before, the problem of radiation transfer in the conditions of resonance radiation propagation in strongly dispersive dense media will be experimentally studied, allowing for the modification of radiative properties of the medium due to the interaction with an intense laser field. A detailed investigation of spectral and angular stability in propagation of intense quasi-monochromatic radiation in resonance media is planned.

The investigation of the characteristics of the formation of non-equilibrium nonlinear resonance radiation is of importance for the diagnostics of hot dense plasmas produced by short pulses of super-powerful lasers or electric installations, as well as for designing X-ray sources and lasers involving such plasmas. The realization of the new project would stimulate rapid progress of experimental techniques. The study of the processes in dense gaseous media provides new possibilities for testing theoretical and computational models with the aid of the well-developed and inexpensive experimental methods employed in laboratory modeling of radiation transfer in gaseous media. New non-equilibrium nonlinear spectroscopy models for dense gases and plasmas, as well as experimental methods for their verification, are to be developed as a result of the project.

Scope of activities

(1) Constructing non-equilibrium non-stationary kinetic models of line radiation formation in dense plasmas and gases; development of numerical methods for calculating the characteristics of resonance radiation of multiply-charged-ion plasma accounting for the nonideality of the radiating medium and the influence of ion dynamics on the broadening of resonance lines and their satellites, the influence of nonlinear interference effects on the profiles of emission and absorption lines of complex ions, as well as incoherent scattering of photons due to the dependence of photon frequency redistribution function on plasma microfields.
(2) Assessment of theoretical methods and their adjustment on the basis of a comparison of the computation results with the data provided by experimental modeling on inexpensive laboratory installations involving dense gaseous media. The project suggests the first experimental study of transfer processes in dense resonance media, to observe a number of essentially new effects, such as the dependence of spontaneous emission probability on the medium density and the quenching of atomic spontaneous radiation at certain values of the parameters of driving laser field.

The realization of the project would insure a higher level of theoretical description of the mechanisms of line spectra formation in non-ideal plasmas, providing an experimental substantiation for the models employed. The results to be obtained might be used for plasma diagnostics and designing radiation sources involving hot dense plasmas produced by the short pulses of super-powerful lasers or electric devices, with the necessary enhancement of experimental techniques. Besides, this work would find application in astrophysical research and solar physics.

International cooperation

The productive international cooperation established within ISTC Project #076 is to be preserved and enhanced. The supposed foreign collaborators are:

- Dr. A.L.Osterheld, Dr. J.K.Nash, Prof. L.Kissel: Lawrence Livermore National Laboratory (LLNL), USA;
- Dr. A.Sureau: Laboratoire de Spectroscopie Atomique et lonique, Universite Paris Sud, France;
- Dr. H.Blum, Dr. G.Kessler: Kernforschungszentram Karlsruhe GmbH, Germany;
- Dr. T.Kato: National Institute for Fusion Science, Nagoya, Japan;
- Prof. H. J.Kunze: Institute fur Experimentalphysik V, Ruhr-Universitat, 44780 Bochum, Germany.

The list mainly coincides with that of Project #076, as the foreign colleagues wished to continue their technical assistance in the works initiated under Project #076.


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