Diffusion of fast rising strong magnetic fields into conductors

International Congress on Energy Fluxes and Radiation Effects

Labetskaya, N.A.^1 ; Oreshkin, V.I.^1,2 ; Chaikovsky, S.A.^1 ; Datsko, I.M.^1 ; Kuskova, N.I.^3 ; Rud, A.D.^4

Institute of High Current Electronics SB RAS, 2/3 Akademichesky Avenue, Tomsk

634055, Russia^1

National Research Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk

634050, Russia^2

Institute of Pulse Processes and Technologies NASU, 43a Zhovtnevy Avenue, Nikolaev

54018, Ukraine^3

G.V. Kurdyumov Institute for Metal Physics NASU, 36 Academician Vernadsky Blvd., Kiev

03680, Ukraine^4

关键词: Aluminum conductors;    Average velocity;    Low temperature plasmas;    Magnetic diffusion;    Normal condition;    Peak currents;    Risetimes;    Strong magnetic fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/552/1/012020/pdf
DOI  :  10.1088/1742-6596/552/1/012020

来源: IOP

【 摘 要 】

The basic processes occurring in a conductor exploding in a current skinning mode are the propagation of a nonlinear magnetic diffusion wave in the conductor and the formation of low-temperature plasma at its surface. An experimental study of the phenomenon of nonlinear magnetic diffusion into conductors in magnetic fields of induction rising at a rate up to 3·109T/s was carried out on the MIG generator capable of producing a peak current up to 2.5 MA within a rise time of 100 ns. It has been found experimentally that the average velocity of a nonlinear magnetic diffusion wave in an aluminum conductor placed in a strong magnetic field (up to 300 T) rising at a high rate (on average, 3·109T/s) is (2.7÷3.3)·105cm/s. This is comparable to the velocity of sound in aluminum under normal conditions and reasonably agrees with predictions of numerical simulations.