Fig. 10

Top: electron temperatures for the hot (2) and cold (1) plasmas, from four simulations with different ρsp. The curves for ion temperatures are similar, except for an overall time dilatation by a factor ~ (mi/me)1/2 = 5. In this figure we use T∞(t) = (T1(t) + T2(t))/2. Except for ρsp = 4 where there is significant numerical heating, T∞(t) is constant in time. Bottom: half-thermalization time for ions and electrons, versus number of superparticles per cell. For ions, we have plotted tth/(mi/me)1/2. The times reported are measured as the initial slope of the temperature curves in a log-lin plot, and thus correspond to tth/2. We see the scaling tth ∝ ρsp.
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