The four AC1 decks run again with the electrons interacting: Coulomb forces between them, their image charges in both plates, and their field at the cathode feeding back on emission. Every dot is a RUMDEED electron moving along its recorded path.
Emission drops by about a sixth, everywhere. Freshly emitted electrons sit a few nanometres above the 30 × 30 nm emitter and weaken the field the next ones tunnel through. The drop is the same at every Γ and at the start and end of each run, which points to each bunch limiting its own emission rather than charge piling up in the gap.
Who crosses barely changes. The cut-offs stay at 48°, 21° and 0°. Space charge only flips electrons that sat on a knife edge: at Γ = 0.5 the peak-field launches whose swing just equals the gap, and at Γ = 0.2 the launches just before the peak whose drift is almost zero. A small Coulomb push stops the first group short and turns the second group's drift around. Those are the dark dots.
Watch the width. The emitter is 30 nm wide (the coloured strip on the cathode), but the dots spread sideways as they fly because the electrons push each other apart. With space charge off they would stay above the emitter. At Γ = 0.2 the slow drifters that linger for many periods end up as far as 1.5 µm to the side, so each lane has its own sideways scale, printed at the bottom of its card.
Runs: decks inputKB02 to inputKB05 (twins of AC1's KA02 to KA05, identical except SPACE_CHARGE = .True.), run with per-step position output. Gold, 5.1 eV, 10 V/nm peak, 1000 nm gap. A dark dot is an electron whose recorded fate differs from the exact single-electron path for its launch time.