We report the first high-repetition-rate generation and simultaneous characterization of nanosecond-scale return currents of kA-magnitude issued by the polarization of a target irradiated with a PW-class high-repetiti...We report the first high-repetition-rate generation and simultaneous characterization of nanosecond-scale return currents of kA-magnitude issued by the polarization of a target irradiated with a PW-class high-repetition-rate titanium:sapphire laser system at relativistic intensities.We present experimental results obtained with the VEGA-3 laser at intensities from5×10^(18)to 1.3×10^(20)W cm^(-2).A non-invasive inductive return-current monitor is adopted to measure the derivative of return currents of the order of kA ns-1and analysis methodology is developed to derive return currents.We compare the current for copper,aluminium and Kapton targets at different laser energies.The data show the stable production of current peaks and clear prospects for the tailoring of the pulse shape,which is promising for future applications in highenergy-density science,for example,electromagnetic interference stress tests,high-voltage pulse response measurements and charged particle beam lensing.We compare the target discharge of the order of hundreds of nC with theoretical predictions and a good agreement is found.展开更多
基金funding from the European Union’s Horizon 2020 research and innovation program through the European IMPULSE project under grant agreement No.871161LASERLABEUROPE V under grant agreement No.871124+5 种基金Grant Agency of the Czech Republic(grant Nos.GM23-05027M and LM2023068)Grant PDC2021120933-I00 funded by MCIN/AEI/10.13039/501100011033 and by the‘European Union Next Generation EU/PRTR’supported by funding from the Ministerio de Ciencia,Innovación y Universidades in Spain through ICTS Equipment grant No.EQC2018-005230Pgrant PID2021-125389OA-I00 funded by MCIN/AEI/10.13039/501100011033/FEDER,UE and by‘ERDF A way of making Europe’by the European Uniongrants of the Junta de Castilla y León,No.CLP263P20 and No.CLP087U16funded by the European Union via the Euratom Research and Training Programme(grant agreement No.101052200-EUROfusion)。
文摘We report the first high-repetition-rate generation and simultaneous characterization of nanosecond-scale return currents of kA-magnitude issued by the polarization of a target irradiated with a PW-class high-repetition-rate titanium:sapphire laser system at relativistic intensities.We present experimental results obtained with the VEGA-3 laser at intensities from5×10^(18)to 1.3×10^(20)W cm^(-2).A non-invasive inductive return-current monitor is adopted to measure the derivative of return currents of the order of kA ns-1and analysis methodology is developed to derive return currents.We compare the current for copper,aluminium and Kapton targets at different laser energies.The data show the stable production of current peaks and clear prospects for the tailoring of the pulse shape,which is promising for future applications in highenergy-density science,for example,electromagnetic interference stress tests,high-voltage pulse response measurements and charged particle beam lensing.We compare the target discharge of the order of hundreds of nC with theoretical predictions and a good agreement is found.
