Trace-transform invariants of tracks of high-velocity jets from the surface of tungsten droplets in the plasma flow

5th International Congress on Energy Fluxes and Radiation Effects 2016

Gulyaev, P.^1 ; Jordan, V.^2,3 ; Gulyaev, I.^1,3 ; Dolmatov, A.^1

Physics and Chemistry Department, Ugra State University, 16 Chekhov street, Khanty-Mansiysk

628012, Russia^1

Physics Department, Altai State University, 61 Lenin avenue, Barnaul

656049, Russia^2

Laboratory for Plasma Dynamics of Disperse Systems, Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, 4/1 Institutskaya street, Novosibirsk

630090, Russia^3

关键词: Analytical expressions;    Concentric circles;    Emission of electron;    Luminous radiation;    Optical brightness;    Physical phenomena;    Spherical collapse;    Spherical shock wave;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/830/1/012151/pdf
DOI  :  10.1088/1742-6596/830/1/012151

来源: IOP

【 摘 要 】

The paper presents the analysis of the recorded tracks of high-velocity emission in the air-argon plasma flow during breaking up of tungsten microdroplets. This new physical effect of optical emission involves two stages. The first one includes thermionic emission of electrons from the surface of the melted tungsten droplet of 100-200 μm size and formation of the charged sphere of 3-5 mm diameter. After it reaches the breakdown electric potential, it collapses and produces a spherical shock wave and luminous radiation. The second stage includes previously unknown physical phenomenon of narrowly directed energy jet with velocity exceeding 4000 m/s from the surface of the tungsten droplet. The luminous spherical collapse and high-velocity jets were recorded using CMOS photo-array operating in a global shutter charge storage mode. Special features of the CMOS array scanning algorithm affect formation of distinctive signs of the recorded tracks, which stay invariant to trace transform (TT) with specific functional. The series of concentric circles were adopted as primitive object models (patterns) used in TT at the spherical collapse stage and linear segment of fixed thickness - at the high-velocity emission stage. The two invariants of the physical object, motion velocity and optical brightness distribution in the motion front, were adopted as desired identification features of tracks. The analytical expressions of the relation of 2D TT parameters and physical object motion invariants were obtained. The equations for spherical collapse stage correspond to Radon-Nikodym transform.