利用整形激光脉冲压缩薄膜靶得到中子源

研究了整形激光脉冲对冰冻氘氚靶的压缩。通过数值分析,发现利用分步激光产生的系列激波压缩氘氚靶可以获得较高密度和较低温度的等离子体靶。初始激光强度的选取将影响到压缩后的等离子体密度,继而影响到产生中子的数量。通过调节初始激光强度可以使压缩后的氘氚靶温度处在反应率比较高的范围内,从而得到优化结果。当初始归一化激光振幅为0.5,最终为32时,压缩后的氘氚靶密度可达到18416倍的临界密度,温度达到16 keV,每焦耳入射激光能量可得到109个中子,这个中子产额比现有其他方法所得到的中子产额大4个数量级。

Neutron Source from Thin Foil Target Compressed by Shaped Laser Pulses

The) frozen deuterium-tritium(DT) foil compressed by shaped laser pulses is explored,and analytical results show that the foil plasma target with relatively high density and low temperature can be obtained after compression by stepped laser-generated multi-shock waves.The choice of initial laser intensity influences the plasma density after compression and the number of neutron to be produced.The optimized result is obtained by adjusting the initial laser intensity to keep a high neutron high productivity in the compressed DT target.When the original scaled laser amplitude is 0.5 and the final 32,the(foil's) density reaches 18416 times critical density,the temperature reaches 16 keV,and 10~9 /J neutrons are produced after compression,which is four orders of magnitude larger than that from other ways.