Understanding the plasma dynamics of advanced energetic materials is crucial for their application.For the first time,this study presents a quantitative,two-dimensional mapping of the electron density distribution in ...Understanding the plasma dynamics of advanced energetic materials is crucial for their application.For the first time,this study presents a quantitative,two-dimensional mapping of the electron density distribution in plasma plumes generated by the laser ablation of glycidyl azide polymer(GAP)-coated nano-aluminum(Al@GAP).We employed a timeresolved,full-field polarizing shear interferometer to capture the plume's spatiotemporal evolution.By analyzing interference fringe shifts with an Abel inversion,we systematically investigated the effects of laser fluence(5.8-24.6 J/cm^(2))and ambient pressure(10-75 kPa).The results reveal peak electron densities on the order of 10^(16)cm^(-3)and complex plume structures governed by interactions with the ambient gas.Notably,we observed a non-monotonic relationship between laser fluence and central electron density,with higher fluences promoting radial expansion and reducing central density.These findings provide unprecedented quantitative insight into the energy release mechanisms and fluid dynamics of Al@GAP plasmas,offering a critical dataset for optimizing high-performance propellants,laser propulsion systems,and other energy-release applications.展开更多
基金supported by the National Key R&D Program of China under the project“Development of High-Precision Propulsion Calibration Systems and Performance Testing Technologies”(Grant No.2021YFC2202800)。
文摘Understanding the plasma dynamics of advanced energetic materials is crucial for their application.For the first time,this study presents a quantitative,two-dimensional mapping of the electron density distribution in plasma plumes generated by the laser ablation of glycidyl azide polymer(GAP)-coated nano-aluminum(Al@GAP).We employed a timeresolved,full-field polarizing shear interferometer to capture the plume's spatiotemporal evolution.By analyzing interference fringe shifts with an Abel inversion,we systematically investigated the effects of laser fluence(5.8-24.6 J/cm^(2))and ambient pressure(10-75 kPa).The results reveal peak electron densities on the order of 10^(16)cm^(-3)and complex plume structures governed by interactions with the ambient gas.Notably,we observed a non-monotonic relationship between laser fluence and central electron density,with higher fluences promoting radial expansion and reducing central density.These findings provide unprecedented quantitative insight into the energy release mechanisms and fluid dynamics of Al@GAP plasmas,offering a critical dataset for optimizing high-performance propellants,laser propulsion systems,and other energy-release applications.
