Figure 3: Percentage of positrons in the leptonic beam.
From: Generation of neutral and high-density electron–positron pair plasmas in the laboratory
(a) Measured (blue circles) and simulated (red crosses) number of positrons 
as a function of the Pb thickness (
, see main text). The green dashed line represents the analytical prediction (discussed in the text). (b) Measured (blue circles) and simulated (red crosses) number of electrons 
as a function of the Pb thickness (
, see main text). The green dashed line represents the analytical prediction (discussed in the text). For these two frames, error bars lie within the size of the circles. (c) Percentage of positrons in the leptonic jet: measured (full blue circles), simulated (red crosses) and analytical prediction (green dashed lines). For all panels, the error bars mainly arise from shot-to-shot fluctuations. FLUKA simulations indicate that the overall number of relativistic electrons and positrons (Ee≥1 MeV) behave in a similar manner. The percentage of positrons in the beam reaches ∼50% for d>2.5 cm≈5Lrad.
