Influence of surface finish on the plasma formation at the skin explosion

31st International Conference on Equations of State for Matter

Datsko, I.M.^1 ; Chaikovsky, S.A.^1,2 ; Labetskaya, N.A.^1 ; Rybka, D.V.^1 ; Oreshkin, V.I.^1 ; Khishchenko, K.V.^3

Institute of High Current Electronics, Siberian Branch, Russian Academy of Sciences, Akademichesky Avenue 2/3, Tomsk

634055, Russia^1

Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, Amundsen 106, Ekaterinburg

620016, Russia^2

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13 Bldg 2, Moscow

125412, Russia^3

关键词: Current amplitude;    Current rise time;    Exposure-time;    Optical camera;    Plasma boundary;    Plasma formations;    Surface finishes;    Terawatt;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/774/1/012194/pdf
DOI  :  10.1088/1742-6596/774/1/012194

来源: IOP

【 摘 要 】

The paper reports on experiments to investigate how the quality of surface finish, i.e., surface roughness, influences the plasma formation in a skin explosion of conductors. The experiments were performed on a MIG terawatt generator with a current amplitude of up to 2.5 MA and current rise time of 100 ns. The plasma formation at the conductor surface and the evolution of the plasma boundary was recorded using a four-frame optical camera with an exposure time of 3 ns per frame. It is shown that the quality of surface finish little affects the onset of plasma formation in a skin explosion of stainless steel and St3 steel conductors at a magnetic field of up to 400 T.