High-power laser-matter interaction and the related High-Energy Density Physics are two important topics in modern physics. However for decades, a very restrictive limitation prevents researchers from studying these topics efficiently: nanosecond-kiloJoule class lasers are typically characterized by a low repetition rate (≈ 1 shot/hour) that restricts the data acquisition and limits the available statistics for analysis. Here, we describe the first results obtained using the high-repetition rate nanosecond-kiloJoule (L4n laser beamline) experimental platform commissioned at the Extreme Light Infrastructure - Beamlines. We proved the capability to deliver hundreds of Joules shots every three minutes with a very good repeatability. Using high-resolution X-ray spectroscopy, we studied highly resolved spectra of H-like and He-like Cl lines emitted from polyvinyl chloride targets and demonstrated that the plasma parameters (electron temperature and density) derived from the measured spectra are consistent with hydro-simulations. These results demonstrate the fulfilment of the designed platform performance which should become one of the most important assets for the High-Energy Density Physics community in the following decades.

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