MHD processes during the cascade development of the neck and hot spot in an X-pinch

Results are presented from two-dimensional MHD simulations of X-pinch implosion. The simulations were performed in the ( r, z ) and ( x, y ) geometries for homogeneous (dense plasma) and heterogeneous (core-corona) loads. The formation of a minidiode, the development of a neck and an X-radiating hot...

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Bibliographic Details
Published in:Plasma physics reports 2008-08, Vol.34 (8), p.619-638
Main Authors: Ivanenkov, G. V., Stepniewski, W., Gus’kov, S. Yu
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Atomic
Dense plasmas
ELECTROMAGNETIC RADIATION
FLUID MECHANICS
HOT SPOTS
HYDRODYNAMICS
IMPLOSIONS
INSTABILITY
IONIZING RADIATIONS
MAGNETOHYDRODYNAMICS
MECHANICS
Molecular
Oblique shock waves
Optical and Plasma Physics
Particle beams
Physics
Physics and Astronomy
PLASMA
Plasma Dynamics
PLASMA INSTABILITY
RADIATIONS
SHOCK WAVES
SIMULATION
X RADIATION
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Summary:Results are presented from two-dimensional MHD simulations of X-pinch implosion. The simulations were performed in the ( r, z ) and ( x, y ) geometries for homogeneous (dense plasma) and heterogeneous (core-corona) loads. The formation of a minidiode, the development of a neck and an X-radiating hot spot, and the influence of the plasma corona on the implosion dynamics of the dense X-pinch plasma were investigated. For through simulations, the conical neck model was used, whereas a detailed analysis of the X-ray burst was performed in the parabolic neck model. The MHD processes occurring during the implosion of oblique shock waves and the onset of instability of the plasma column were examined. It is found that, due to the quasi-periodic character of these processes, the neck compression proceeds in a cascade fashion. The plasma state in a hot spot just before the break of the neck is analyzed, and the possibility of generating fast particle beams is considered.
ISSN:1063-780X
1562-6938
DOI:10.1134/S1063780X08080011