斜入射激光等离子体堵口时空特性研究

THE PROPERTY INVESTIGATION OF TIME AND SPACE FOR THE PLASMA CLOSURE CAUSED BY SLANTING INCIDENCE LASER

在“星光Ⅱ”上首次利用Ｘ光１２分幅相机（ＸＦＣ）成功地观测到了１．０５３μｍ激光以４５°方向斜入射孔靶和半腔靶等离子体堵口的时间和二维空间图像，获得了等离子体堵口速度，同时通过一维模型给出了斜入射条件下的等离子体堵口速度。实验结果表明：相同参数条件下半腔靶与孔靶相比，等离子体喷射速度高约１５％。一维模型给出的等离子体喷射速度与ＸＦＣ测出的等离子体喷射速度在实验误差范围内是一致的。

The plasma closure images of two-dimensional space and one-dimensional time for 1. 053μm slanting incidence laser were observed successfully for the first time at the 'XingguangII' facility with an X-ray twelve-frame camera. The plasma closure velocities under the condition of laser slanting incidence have been obtained separately by experiment and one-dimensional model. The experimental results show that under the same conditions the plasma expanding speed is 15% higher for half-cavity targets than that for hole targets.