Understanding the physics of electromagnetic pulse(EMP) emission and nozzle damage is critical for the long-term operation of laser experiments with gas targets, particularly at facilities looking to produce stable so...Understanding the physics of electromagnetic pulse(EMP) emission and nozzle damage is critical for the long-term operation of laser experiments with gas targets, particularly at facilities looking to produce stable sources of radiation at high repetition rates. We present a theoretical model of plasma formation and electrostatic charging when high-power lasers are focused inside gases. The model can be used to estimate the amplitude of gigahertz EMPs produced by the laser and the extent of damage to the gas jet nozzle. Looking at a range of laser and target properties relevant to existing high-power laser systems, we find that EMP fields of tens to hundreds of kV/m can be generated several metres from the gas jet. Model predictions are compared with measurements of EMPs, plasma formation and nozzle damage from two experiments on the VEGA-3 laser and one experiment on the Vulcan Petawatt laser.展开更多
基金funded by the European Union via the Euratom Research and Training Programme(Grant Agreement No.101052200–EUROfusion)funded by MCIN/AEI/10.13039/501100011033/FEDER+4 种基金funded by the European Unionsupport from the LIGHT S&T Graduate Program(PIA3Investment for the Future Program,ANR-17-EURE-0027)funding from the European Union’s Horizon 2020 research and innovation programme through the European IMPULSE project under grant agreement No.871161 and from LASERLAB-EUROPE V under grant agreement No.871124co-financed by the Polish Ministry of Science and Higher Education within the framework of the scientific financial resources for 2021–2022 under contract No.5205/CELIA/2021/0(project CNRS No.239915)the financial support of the Id Ex University of Bordeaux/Grand Research Program‘GPR LIGHT’
文摘Understanding the physics of electromagnetic pulse(EMP) emission and nozzle damage is critical for the long-term operation of laser experiments with gas targets, particularly at facilities looking to produce stable sources of radiation at high repetition rates. We present a theoretical model of plasma formation and electrostatic charging when high-power lasers are focused inside gases. The model can be used to estimate the amplitude of gigahertz EMPs produced by the laser and the extent of damage to the gas jet nozzle. Looking at a range of laser and target properties relevant to existing high-power laser systems, we find that EMP fields of tens to hundreds of kV/m can be generated several metres from the gas jet. Model predictions are compared with measurements of EMPs, plasma formation and nozzle damage from two experiments on the VEGA-3 laser and one experiment on the Vulcan Petawatt laser.
