The Initial Stage of Neck Formation in an X-Pinch

5th International Congress on Energy Fluxes and Radiation Effects 2016

Oreshkin, V.I.^1,2 ; Artyomov, A.P.^1 ; Chaikovsky, S.A.^1,3,4 ; Oreshkin, E.V.^4 ; Tsventoukh, M.M.^4

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

634055, Russia^1

National Research Tomsk Polytechnical University, Lenin Avenue 30, Tomsk

634050, Russia^2

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

620016, Russia^3

Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Avenue 53, Moscow

119991, Russia^4

关键词: Current rise;    Current rise rates;    Electrical explosion;    Kinetic pressure;    Metal wires;    Neck formation;    Thermodynamic parameter;    X-pinches;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/830/1/012013/pdf
DOI  :  10.1088/1742-6596/830/1/012013

来源: IOP

【 摘 要 】

A model is proposed to describe the initial stage of neck formation in an X-pinch that proceeds in three stages: the electrical explosion of metal wires that generates the X-pinch; the expansion of the wire material that occurs due to an excess of the gas-kinetic pressure over the pressure of the magnetic field. The model allows one to predict the minimum rate of current rise at which the formation of a "hot spot" in an X-pinch is possible. The minimum current rise rate is determined by the thermodynamic parameters of the wires at a critical point; it is of the order of 1 kA/ns.