Skip to main content
European Commission logo print header
Contenuto archiviato il 2022-12-23

EMHD Plasmas

Obiettivo

The project proposed is devoted to the electron magnetohydrodynamics (EMHD), a new branch of plasma physics. EMHD phenomena are typical for pulsed plasmas, rarefied space plasmas, and metals (especially, thin films). To a great extent, EMHD has been developed during the last decade, by the leading role of one of the Russian teams and by the essential role of the Israelian team involved. The goals of the theoretical activity are the following:
1) Theoretical studies of the self-consistent dynamics of the magnetic field on the background of the plasma inhomogeneity caused by convection, diffusion, and superdiffusion;
2) Theoretical investigations of fast helical plasma instabilities and anomalous resistivity created by these modes;
3) Analytical studies of 3-d kinetic effects and their influence on the multicomponent MHD phenomena, first of all, on transport phenomena;
4) Analytical and numerical studies of the electron Rayleigh-Taylor instability, of electron shocks at the boundary between the plasma and conducting electrode, and of Lagrange invariants in Hall plasmas;
5) Analytical and numerical modelling of both quasineutral and nonneutral near-electrode plasmas in high-current diodes, instabilities of the collisionless skin in the Hall plasmas. These problems will be solved by the theoretical group of the Kuchatov Institute, in collaboration with Moscow Institute of Physics and Technology, and German and Israelian teams as well.

The goals of the advanced numerical study will be the following:
1) Numerical simulations of fast Z-pinches and plasma-filled diodes, numerical studies of non-1-d effects as well as of their effect on the dynamics of the plasma compression;
2) In the problem of high-current diodes, the main goal of the research planned is to study, both analytically and numerically, the eddy currents and EMHD phenomena in near-electrode plasmas. These problems have to be solved by the mathematical group of the Moscow Institute of Physics and Technology, in close contact with Kurchatov Institute and German and Israelian colleagues.

Experimental problems that will have to be studied by the experimental group of the Kurchatov Institute, in collaboration with German and Israelian experimentalists, are the following:
1)Investigate the suprathermal EMHD waves (helical modes) in the plasma-filled diode by means of laser scattering;
2) Analyse of the HF noise from EMHD plasmas;
3) Optically record the current flow lines in the regime of anomalous excitation of the EMHD waves, experimentally investigate the structure of the KMC wave (EMHD schock);
4)Study the ion flow in plasma-filled diodes (including plasma opening switches);
5) Experimental verification of the scenario of plasma switching.
The following results are expected to be obtained:

1) essential modification of the EMHD theory, in particular: self-consisted analytical EMHD theory combining the plasma inhomogeneity with convection, diffusion and superdiffusion of the magnetic field, theory of the anomalous resistivity in the EMHD regime, analytical study, aimed to the subsequent numerical study, of the three-dimensional kinetic effects in the multifluid MHD, theory of mixing of the Lagrange invariants in the Hall plasmas, theory of the nonquasineutral EMHD phenomena, theoretical modelling of inter-diode plasmas.

2) experimental evidence of basic EMHD manifestations in the plasma-filled diode: registration of the EMHD waves and identification of the anomalous resistivity of EMHD origin, registration of current flow lines, experimental study of the nonlinear structure of the EMHD shock, matching of calculated and measured values in the EMHD plasmas, scenario of plasma switching.

3) algorithms and experience of numerical simulations of the EMHD regime, in particular: taking into account essentially non-onedimensional effects, modification of respectively simple and well-operating MHD codes to include the effects of EMHD origin.
The total number of Russian scientists involved is 15, including 5 young scientists.

Invito a presentare proposte

Data not available

Meccanismo di finanziamento

Data not available

Coordinatore

Forschungszentrum Karlsruhe
Contributo UE
Nessun dato
Indirizzo
Weberstrasse 5
76133 Karlsruhe
Germania

Mostra sulla mappa

Costo totale
Nessun dato

Partecipanti (3)