Measurements of the longitudinal diffusion coefficient and the drift velocity for electron swarms in hydrogen and nitrogen using a time-of-flight technique

Results of numerical simulation of two-and three-electrode spark gaps operating with pure nitrogen gas are compared. Our result show that in both cases the discharge process evolves via two stages very similar to that was reported in nitrogen glow discharge studies. First, the primary electrons produce positive nitrogen ions; second, the produced ions can disturb the applied field, and can create the space charge region. The undulations observed are because of the secondary effects, in particular, the cathode-directed streamers. The delay time for the three-electrode spark gap is more than that of the two-electrode discharge. Current growth is faster for the two-electrode spark gap in comparison with the three-electrode one. The oscillations are more enhanced for the case of the three-electrode spark gap. Our simulation method provides both temporal and spatial information concerning the operation of such switches. The reported results are helpful in design and optimization of both the two-and three-electrode spark gaps.

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The development of electron avalanches in argon at high E/N values. I. Monte Carlo simulation

Sakai

Tagashira

Sakamoto

1977

J. Phys. D: Appl. Phys.

141

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The behaviour of electron avalanches in argon when appreciable electron impact ionization occurs, is studied by a Monte Carlo simulation. The values of electron swarm parameters are obtained for steady-state Townsend, pulsed Townsend and time-of-flight experiments, by applying sampling techniques appropriate to the respective experiments. The results suggest that the value of an electron swarm parameter, such as the ionization frequency or the electron drift velocity, depends on the type of experiments for which there is appreciable electron impact ionization. The properties of electron avalanches in an electron energy non-equilibrium region, for example the variation of the electron energy distribution with distance from the cathode, and the effect of anisotropic scattering of electrons on the swarm parameters very close to the anode, are also studied.

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Measurements of the longitudinal diffusion coefficient and the drift velocity for electron swarms in hydrogen and nitrogen using a time-of-flight technique

Cited by 9 publications

References 1 publication

Time-of-flight measurement of electron drift velocity and longitudinal diffusion coefficient in nitrogen, carbon monoxide, carbon dioxide and hydrogen

Time-of-flight measurement of electron drift velocity and longitudinal diffusion coefficient in nitrogen, carbon monoxide, carbon dioxide and hydrogen

Comparison between the discharge development in the two- and three-electrode spark gap switches

The development of electron avalanches in argon at high E/N values. I. Monte Carlo simulation

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