Ionization features in cathode spot region of vacuum arc : научное издание

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.1016/j.vacuum.2020.109509

Ключевые слова: Cathode spot, Ionization, Langmuir waves, Mathematical modeling, Vacuum arc, Cathodes, Differential equations, Hot electrons, Nonlinear equations, Numerical methods, Temperature, Vacuum applications, Vacuum technology, Comsol multiphysics, Cylindrical plasmas, Double electric layer, Ionization process, Low temperature plasmas, Non-equilibrium process, System of equations, System of nonlinear differential equations, Electric discharges

Аннотация: A model of ionization processes in a low-temperature plasma within the cathode region of a vacuum arc is presented. This mathematical model is represented by a system of nonlinear differential equations of drift-diffusion for the electron density and the average energy of second-order electrons. The system of equations was solved by the finite element method in two coordinates in numerical form using the COMSOL Multiphysics software program. It was shown that due to nonequilibrium processes, Langmuir waves appeared at the plasma boundary, which leads to multistage ionization of metal vapor. The arc discharge was presented in the form of a cylindrical plasma column with a length of 200 ?m and a diameter of 50 ?m. At the interface between the cathode and the plasma column, a double electric layer has appeared which holds hot electrons in the central zone of the discharge. High specific power was focused close to the cathode surface, which provided the continuous supply of metal vapor. The numerical results of the model have appeared to be in good agreement with the experimental data

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Издание

Журнал: Vacuum

Выпуск журнала: Vol. 179

Номера страниц: 109509

Издатель: Elsevier Ltd

Авторы

  • Ushakov A.V. (Federal Research Center Krasnoyarsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation)
  • Karpov I.V. (Siberian Federal University, Krasnoyarsk, 660041, Russian Federation)
  • Shaihadinov A.A. (Siberian Federal University, Krasnoyarsk, 660041, Russian Federation)
  • Fedorov L.Y. (Federal Research Center Krasnoyarsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation)
  • Goncharova E.A. (Siberian Federal University, Krasnoyarsk, 660041, Russian Federation)
  • Demin V.G. (Siberian Federal University, Krasnoyarsk, 660041, Russian Federation)

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