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Collisions electrically charge grains which promotes growth by coagulation.We present aggregation experiments with three large ensembles of basalt beads($150\,\mu\mathrm{m} - 180\,\mu\mathrm{m})$, two of which are charged, whileone remains almost neutral as control system. In microgravity experiments, freecollisions within these samples are induced with moderate collision velocities($0 - 0.2 \,\mathrm{m\,s}^{-1}$). In the control system, coagulation stops at(sub-)mm size while the charged grains continue to grow. A maximum agglomeratesize of 5\,cm is reached, limited only by bead depletion in the free volume.For the first time, charge-driven growth well into the centimeter range isdirectly proven by experiments. In protoplanetary disks, this agglomerate sizeis well beyond the critical size needed for hydrodynamic particle concentrationas, e.g., by the streaming instabilities.

A Smoking Gun for Planetesimal Formation: Charge Driven Growth into a New Size Range