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.
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Funding
The work was carried out within the framework of the 10th project of the National Center for Physics and Mathematics (NTsFM) “Experimental laboratory astrophysics and geophysics” using a unique scientific facility “Complex of large-scale geophysical test facilities of the IAP RAS” (UNU CCGS).
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Korobkov, S.V., Nikolenko, A.S., Gushchin, M.E. et al. 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. Astron. Rep. 67, 93–103 (2023). https://doi.org/10.1134/S1063772923010031
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DOI: https://doi.org/10.1134/S1063772923010031