Maximum Radiative Yield in Plasma
Production of the Maximum Radiative Yield in the Plasma of Pulsed and Laser Systems
Tech Area / Field
- PHY-PLS/Plasma Physics/Physics
8 Project completed
Senior Project Manager
Tyurin I A
FIAN Lebedev / Quantum Radiophysics Department of the Lebedev Physical Institute of Russian Academy of Sciences, Russia, Moscow
- VNIIEF, Russia, N. Novgorod reg., Sarov\nKeldysh Institute of Applied Mathematics, Russia, Moscow
- Universidad Politecnica de Madrid / Instituto de Fusion Nuclear, Spain, Madrid\nOkayama University, Japan, Okayama
Project summaryThe goal of the project is to produce maximal radiation yield in small-size plasma of high-current pulsed and laser systems by using the nonequilibrium properties of matter and radiation in such systems. It is proposed to study in detail the specific properties of plasma, nonideal and nonequilibrium, which are due, in particular, to the radiation yield in optically thin plasma. The problem of a radiative gas dynamics where the state of ions depends on the radiative field, in the place of the ions location, will be solved completely. The radiation, in its turn, depends on the state of ions, dimension, and shape of a radiated plasma, so the total problem includes a complex integrated matching of states of all the ions and the radiative field within the total plasma area. As a result, there will be developed the models and programs for calculation of the radiative properties of dense high-temperature plasma with nonequilibrium radiation, and the methods will be devised for taking into account nonequilibrium properties in solving the radiative gas dynamics problems. Basing on the knowledge of nonequilibrium radiation in any particular plasma system, one would determine the conditions under which the nonequilibrium radiation has maximal output thus stabilizing the processes occurring in plasma.
The results of this project will find application in the following areas:
- technological applications, e.g., X-ray lithography;
- fundamental research in laser plasma physics;
- nonequilibrium plasma simulation and interpretation of experimental results on strong-current pulsed facilities of the Angara, SATURN, and PBFAZ type;
- laser interaction with matter under strongly nonequilibrium conditions in fundamental physics problems; the determination of plasma characteristics being of interest for astrophysics problems;
- modeling of the plasma media used in X-ray lasers.
New models of an atom in a nonideal nonequilibrium plasma will be considered in terms of a full system of the level-population kinetic equations including the processes induced by nonequilibrium fields of radiation. Possible types of the radiative fields that are typical of the laser, beam, and discharge experiments are determined on the basis of experimental data and numerical simulation. The wave functions, energies of levels, oscillator strengths, and the rate coefficients of elementary processes will be calculated on the basis of a Hartree-Fock-Slater self-consistent field model, which takes into account the nonideal effect and the processes of interaction with the nonequilibrium radiation. Basing on the calculations and comparison with the experimental data of Nova, Angara, and PBFA-Z facilities, the models will be verified, the effective algorithms will be developed, and the specific interpolation procedures will be devised for using nonequilibrium constants in kinetic and gas-dynamic calculations utilizing more simple models, such as, for example, a nonequilibrium model of an average ion. As a result, there will be obtained the absorption coefficients and the radiative capability of an optically thin, nonequilibrium plasma for a number of substances, like agar-agar, Ar, Mo, Xe, etc.
The algorithms and programs will be developed for consideration of a nonequilibrium radiation and its influence on the plasma parameters in the radiative gas dynamics problems, and they can be applied in modern technologies to various problems connected with the usage of the properties of small-size pulse-discharge sources of nonequilibrium radiation. Particular attention will be paid to the optimization of the generation process in the given spectral range in order to solve the problems of X-ray lithography.
The fraction of weapon scientists suggested to participate in the present Project is more than 55% of the total number of participants, and more than 65% of the total Project effort. Such a cooperation of weapon scientists in the basic research will promote solution of the conversion problem.
The foreign scientists, the experts in the field of nonequilibrium plasma and optical properties of substances, have expressed their willingness to participate in the Project. Foreign collaborators will discuss general problems, specific tasks of the Project, as well as the Project results.
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