Kinetic theory of high-voltage low-pressure gas discharge with electron initiation on a cathode in a planar gap

Kozyrev, A. V.; Kozhevnikov, V. Yu.; Semeniuk, Natalia

doi:10.1088/1361-6595/abbf95

Cited by 11 publications

(5 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They can be used are also generated in tokamak-type setups, including ITER, and damage the internal components of the vacuum chamber [8][9][10][11]. In nanosecond gas discharges, REs are often generated in the prebreakdown stage [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. They can be measured directly with a collector or by measuring x-ray radiation [29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Generation of runaway electrons in plasma after a breakdown of a gap with a sharply non-uniform electric field strength distribution

Белоплотов¹,

Тарасенко²,

Shklyaev³

et al. 2021

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The paper is devoted to the study of the initiation and formation of a negative streamer in a sharply inhomogeneous electric field and the generation of runaway electrons (REs) in air and helium at atmospheric pressure and below, as well as in sulfur hexafluoride at low pressure. Nanosecond voltage pulses of negative polarity with an amplitude of 18 kV were applied across a point-to-plane gap 8.5 mm long. The studies were carried out using broadband measuring sensors and equipment with picosecond time resolution, as well as using a four-channel ICCD camera. Using a special method for measuring the dynamic displacement current caused by the redistribution of the electric field during streamer formation, the waveforms of voltage, discharge current, RE current, and dynamic displacement current were synchronized to each other, as well as to ICCD images. Data on the generation of REs with respect to the dynamics of streamer formation were obtained. It was found that REs are generated not only during the breakdown of the gap, but also after that. It has been found that the formation time of explosive emission centers affects the generation of REs after breakdown. Based on the measurement data of the voltage, discharge current, and dynamic displacement current, the electron concentration in the plasma channel after breakdown and the electric field strength near the surface of the grounded electrode were calculated.

show abstract

Section: Introductionmentioning

confidence: 99%

Generation of runaway electrons in plasma after a breakdown of a gap with a sharply non-uniform electric field strength distribution

Белоплотов¹,

Тарасенко²,

Shklyaev³

et al. 2021

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…The full kinetics of the collisionless expansion of the electron-ion plasma demonstrates the realistic velocities of the plasma jet and the energy spectrum of the ions in the flow. Of course, these conclusions do not exclude the influence of other mechanisms of ion acceleration in vacuum discharges, such as the 'potential hump' [13], 'electron wind' [6], or 'pressure gradient in fluid' [12]. We have shown that the only principles of physical kinetics give a good explanation of the observed facts.…”

Section: Discussionmentioning

confidence: 75%

“…There are many theoretical models of current transfer in vacuum and low-pressure discharges [6,13,14]. But most of these models describe plasma in terms of the fluid continuum approximation.…”

Section: Introductionmentioning

confidence: 99%

Initial kinetics of electrons, ions and electric field in planar vacuum diode with plasma cathode

Kozyrev,

Kozhevnikov,

Semeniuk

et al. 2023

Plasma Sources Sci. Technol.

Self Cite

View full text Add to dashboard Cite

The paper presents the results of a 1D1V theoretical study of the initial stage of plasma expansion into a planar vacuum gap 1 cm long with an applied voltage of 500–5000 V. Based on the collisionless kinetic and Maxwell equations, the motion of a two-component electron–ion plasma in a self-consistent electric field is described. The fundamental mechanism of ‘superthermal’ velocities of the emission edge of the plasma and anode-directed velocities of positive ions is demonstrated in detail. The general regularities of this process are established for variations in the number density of the initial plasma and the applied voltage.

show abstract

“…The charge of free electrons and ions is balanced, resulting in an overall electrical neutrality in the plasma. Within the Debye length, the Boltzmann kinetic equation serves as the fundamental equation for describing the distribution of plasma [12,13].…”

Section: Kinetic Equation For Electrons and Ionsmentioning

confidence: 99%

Material removal model for describing the plasma discharge effect in magnetic-electrolytic plasma polishing

Xiang,

Sun,

Yang

et al. 2024

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Considering that the regulating physical mechanism of the magnetic field on electrolytic plasma is insufficient, this study introduces a plasma discharge model to demonstrate its effect on material removal in magnetic-electrolytic plasma polishing. Firstly, we establish a mathematical model to describe plasma discharge induced by electron collision. The Boltzmann kinematic equations are employed to elucidate the physical dynamics of electrons and their momentum distribution function during ionization collisions. Secondly, we derive the surface material removal equation based on the instantaneous high-temperature melting of plasma discharge and establish the corresponding boundary conditions for simulation calculations. Subsequently, we conduct electromagnetic plasma polishing experiments under varying magnetic field intensities using TA1 titanium alloy as the test material. Our simulation results demonstrate that the magnetic field enhances the spatial electric field formed by the uneven distribution of ion electrons, expediting the plasma discharge process towards the anode and generating interference currents to counterbalance the required material removal current. Experimental data is provided to validate the model, consistently revealing a positive correlation between circuit current and material removal rate. The research demonstrates the rationality and reliability of the material removal model for plasma discharge, offering a fundamental understanding of electromagnetic plasma polishing.

show abstract

Kinetic theory of high-voltage low-pressure gas discharge with electron initiation on a cathode in a planar gap

Cited by 11 publications

References 23 publications

Generation of runaway electrons in plasma after a breakdown of a gap with a sharply non-uniform electric field strength distribution

Generation of runaway electrons in plasma after a breakdown of a gap with a sharply non-uniform electric field strength distribution

Initial kinetics of electrons, ions and electric field in planar vacuum diode with plasma cathode

Material removal model for describing the plasma discharge effect in magnetic-electrolytic plasma polishing

Contact Info

Product

Resources

About