Current density of the positrons as a function of the solids-to-gas ratio in the particle filament shown in Fig. 1. The current density is above 2 × 10-14 C m-2 s-1 through the entire filament. The right axis shows the rate of change of the electric field. The breakdown electric field will be reached in the filament after a characteristic time-scale of only approximately 103 s.
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