【摘要】 利用大功率脉冲TEA-CO2激光器作为光源,对不同元素、浓度以及颗粒直径金属掺入PVC的靶材进行了测试。结果发现,不同元素种类以及不同颗粒直径的金属掺杂后的PVC靶材的冲量耦合系数变化不大,但在不同功率密度处,比冲均有显著提高,其中纳米Fe粉性能最为优异。在功率密度为5×106W/cm2处,50%纳米Fe粉质量分数的靶材的比冲出现最大值。在大气环境下,对于掺有20%纳米Zn粉质量分数的PVC靶材,其冲量耦合系数随激光功率密度的提高而先升后降,比冲并不优异于比其熔点更高的Fe粉和Ni粉掺杂。更多还原

【Abstract】 The metal particles of different elements,concentrations and diameters are doped in PVC and the targets are tested by using a high-power pulsed TEA-CO2 laser.The results show that: the coupling coefficient changes slightly with elements and diameters of metal particles doped in PVC,but the specific impulse is significantly improved for different laser power densities.The doped nano-Fe powder PVC shows the best performance;the maximum specific impulse appears at 50% nano-Fe power concentration for the energy density of 5×106 W/cm2.At the atmospheric environment,the coupling coefficient for PVC target containing 20% nano-zinc powder increases first and then decreases with the increase of laser power density,and the specific impulse is not even better than that for PVC targets doped with the higher melting-point metals,such as,Fe and Ni.更多还原