The generation of intense radio-frequency and microwave electromagnetic pulses(EMPs)by the interaction of a highpower laser with a target is an interesting phenomenon,the exact mechanisms of which remain inadequately ...The generation of intense radio-frequency and microwave electromagnetic pulses(EMPs)by the interaction of a highpower laser with a target is an interesting phenomenon,the exact mechanisms of which remain inadequately explained.In this paper we present a detailed characterization of the EMP emission at a sub-nanosecond kilojoule laser facility,the Prague Asterix Laser System.The EMPs were detected using a comprehensive set of broadband diagnostics including B-dot and D-dot probes,various antennas,target current and voltage probes and oscilloscopes with 100 and 128 GS/s sampling.Measurements show that the EMP spectrum was strongly dependent on the laser energy:the maximum frequency of the spectrum and the frequency of the spectrum centroid increased with increasing laser beam energy in the signals from all detectors used.The highest observed frequencies exceeded 9 GHz.The amplitude and energy of the detected EMP signals were scaled as a function of laser energy,power and number of emitted electrons.展开更多
基金supported by the Grant Agency of the Czech Republic(Project No.GM23-05027M)the Czech Republic’s Ministry of Education,Youth and Sports(Project No.LM2023068)+4 种基金funding from the European Union’s Horizon 2020 research and innovation program through the European IMPULSE project under grant agreement No.871161supported by funding made available by the Ministerio de Ciencia,Innovacion y Universidades in Spain through grants EQC2018-005230-P and PID2021-125389OA-I00This work has been carried out within the framework of the EUROfusion Consortium,funded by the European Union via the Euratom Research and Training Programme(Grant Agreement No.101052200-EUROfusion)The involved teams have operated within the framework of the Enabling Research Project AWP24-ENR-IFE.02.CEA-01‘Magnetized ICF’funded in part by the French Agence Nationale de la Recherche(ANR),project No.ANR-22-CE30-0044。
文摘The generation of intense radio-frequency and microwave electromagnetic pulses(EMPs)by the interaction of a highpower laser with a target is an interesting phenomenon,the exact mechanisms of which remain inadequately explained.In this paper we present a detailed characterization of the EMP emission at a sub-nanosecond kilojoule laser facility,the Prague Asterix Laser System.The EMPs were detected using a comprehensive set of broadband diagnostics including B-dot and D-dot probes,various antennas,target current and voltage probes and oscilloscopes with 100 and 128 GS/s sampling.Measurements show that the EMP spectrum was strongly dependent on the laser energy:the maximum frequency of the spectrum and the frequency of the spectrum centroid increased with increasing laser beam energy in the signals from all detectors used.The highest observed frequencies exceeded 9 GHz.The amplitude and energy of the detected EMP signals were scaled as a function of laser energy,power and number of emitted electrons.
