Monte-Carlo calculation of the electron energy distribution function of a He–N2 plasma of a high-voltage pulsed discharge

In the present work, results of investigations into the dynamics of secondary electrons with helium atoms in the presence of the reverse electric field arising in the flare of a high-voltage pulsed beam-type discharge and leading to degradation of the primary electron beam are presented. The electric field in the discharge of this type at moderate pressures can reach several hundred V/cm and leads to considerable changes in the kinetics of secondary electrons created in the process of propagation of the electron beam generated in the accelerating gap with a grid anode. Moving in the accelerating electric field toward the anode, secondary electrons create the so-called compensating current to the anode. The character of electron motion and the compensating current itself are determined by the ratio of the field strength to the concentration of atoms (Е/n). The energy and angular spectra of secondary electrons are calculated by the Monte Carlo method for different ratios E/n of the electric field strength to the helium atom concentration. The motion of secondary electrons with threshold energy is studied for inelastic collisions of helium atoms and differential analysis is carried out of the collisional processes causing energy losses of electrons in helium for different E/n values. The mechanism of creation and accumulation of slow electrons as a result of inelastic collisions of secondary electrons with helium atoms and selective population of metastable states of helium atoms is considered. It is demonstrated that in a wide range of E/n values the motion of secondary electrons in the beam-type discharge flare has the character of drift. At E/n values characteristic for the discharge of the given type, the drift velocity of these electrons is calculated and compared with the available experimental data.

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Spectroscopic investigation of the spatiotemporal dynamics of an electric field in plasma of a beam-type high-voltage discharge in helium

Demkin

Melnichuk

2015

Physics of Plasmas

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In the present work, a method of determining the spatiotemporal characteristics of the electric field strength in an accelerating gap and a plasma flare of a beam-type high-voltage pulsed discharge in He at moderate pressure is presented. The method is based on spectroscopic data on the Stark splitting of π-components of He 2P–4Q transitions; Q = D(4921.93 Å), F(4920.35 Å) in the near-cathode region of the discharge and on the spatiotemporal characteristics of intensities of He(2s1S–3p1P0) spectral lines with λ = 5015 Å and He+(3d–4f) spectral lines with λ = 4685 Å measured experimentally and calculated from the data of statistical simulation of the electron kinetics by the Monte Carlo method. The shape and strength of the electric field of the space charge in the interelectrode gap and the drift region of the discharge are estimated. It is demonstrated that the electric field created by the current pulse of uncompensated space charge in the near-anode region changes the discharge regime and causes degradation of the electron beam in the plasma flare. It is established that the flux of secondary electrons from the drift region to the anode has significant effect on the radiation intensity distribution in this region of the discharge.

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Monte-Carlo calculation of the electron energy distribution function of a He–N2 plasma of a high-voltage pulsed discharge

Cited by 6 publications

References 3 publications

Investigation of the spatiotemporal characteristics of the electric field in the Ne-H₂ plasma of a beam-type high-voltage pulsed discharge

Investigation of the spatiotemporal characteristics of the electric field in the Ne-H₂ plasma of a beam-type high-voltage pulsed discharge

Statistical analysis of the dynamics of secondary electrons in the flare of a high-voltage beam-type discharge

Spectroscopic investigation of the spatiotemporal dynamics of an electric field in plasma of a beam-type high-voltage discharge in helium

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Monte-Carlo calculation of the electron energy distribution function of a He–N2 plasma of a high-voltage pulsed discharge

Cited by 6 publications

References 3 publications

Investigation of the spatiotemporal characteristics of the electric field in the Ne-H2 plasma of a beam-type high-voltage pulsed discharge

Investigation of the spatiotemporal characteristics of the electric field in the Ne-H2 plasma of a beam-type high-voltage pulsed discharge

Statistical analysis of the dynamics of secondary electrons in the flare of a high-voltage beam-type discharge

Spectroscopic investigation of the spatiotemporal dynamics of an electric field in plasma of a beam-type high-voltage discharge in helium

Contact Info

Product

Resources

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Investigation of the spatiotemporal characteristics of the electric field in the Ne-H₂ plasma of a beam-type high-voltage pulsed discharge

Investigation of the spatiotemporal characteristics of the electric field in the Ne-H₂ plasma of a beam-type high-voltage pulsed discharge