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We report the first high-repetition rate generation and simultaneouscharacterization of nanosecond-scale return currents of kA-magnitude issued bythe polarization of a target irradiated with a PW-class high-repetition-rateTi:Sa laser system at relativistic intensities. We present experimental resultsobtained with the VEGA-3 laser at intensities from 5e18 - 1.3e20 W/cm2. Anon-invasive inductive return-current monitor is adopted to measure thederivative of return-currents on the order of kA/ns and analysis methodology isdeveloped to derive return-currents. We compare the current for copper,aluminium and Kapton targets at different laser energies. The data shows thestable production of current peaks and clear prospects for the tailoring of thepulse shape, promising for future applications in high energy density science,e.g. electromagnetic interference stress tests, high-voltage pulse responsemeasurements, and charged particle beam lensing. We compare the targetdischarge of the order of hundreds of nC with theoretical predictions and agood agreement is found.

High-repetition-rate source of nanosecond duration kA-current pulses driven by relativistic laser pulses