Features of Dynamics and Instability of Plasma Jets Expanding into an External Magnetic Field in Laboratory Experiments with Compact Coaxial Plasma Generators on a Large-Scale “Krot” Stand

S. V. Korobkov; Коробков С. В.; A. S. Nikolenko; Николенко А. С.; M. E. Gushchin; Гущин М. Е.; A. V. Strikovsky; Стриковский А. В.; I. Yu. Zudin; Зудин И. Ю.; N. A. Aidakina; Айдакина Н. А.; I. F. Shaikhislamov; Шайхисламов И. Ф.; M. S. Rumenskikh; Руменских М. С.; R. S. Zemskov; Земсков Р. С.; M. V. Starodubtsev; Стародубцев М. В.

doi:10.31857/S0004629923010036

Features of Dynamics and Instability of Plasma Jets Expanding into an External Magnetic Field in Laboratory Experiments with Compact Coaxial Plasma Generators on a Large-Scale “Krot” Stand

Authors: Korobkov S.V.¹, Nikolenko A.S.¹, Gushchin M.E.¹, Strikovsky A.V.¹, Zudin I.Y.¹, Aidakina N.A.¹, Shaikhislamov I.F.², Rumenskikh M.S.², Zemskov R.S.¹, Starodubtsev M.V.¹
Affiliations:
1. Institute of Applied Physics, Russian Academy of Sciences
2. Institute of Laser Physics Siberian Branch of the Russian Academy of Sciences
Issue: Vol 100, No 1 (2023)
Pages: 107-118
Section: Articles
URL: https://ruspoj.com/0004-6299/article/view/647542
DOI: https://doi.org/10.31857/S0004629923010036
EDN: https://elibrary.ru/NPODLB
ID: 647542

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Abstract

Structural instabilities that develop during pulsed injection of dense plasma jets into vacuum in the presence of an external quasi-homogeneous magnetic field are studied by high-speed photography using ICCD cameras. The experiments are carried out in the chamber of the “Krot” stand, which has record-breaking dimensions in its class of installations (diameter—3 m, length of the working section—10 m), and makes it possible to study plasma dynamics by various diagnostic methods at scales of more than 1 m both along the magnetic field and in the direction transverse to the magnetic field. During injection along the magnetic field, a transverse collimation of the flow of ionized matter and the development of a flute instability of the plasma boundary are observed, which, at the late stages of expansion, leads to the plasma leaving the injection region in the form of several jets across the field. During transverse injection, the formation of a collimated flow, a “plasma sheet,” is observed, in which, as the plasma moves across the field, inhomogeneous structures develop in the direction of injection.

Keywords

laboratory modeling, laboratory astrophysics, magnetohydrodynamics, jet, flute instability

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