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报道了成像型任意反射面速度干涉仪(VISAR)在快点火锥壳靶预热实验中的应用情况,对不同的金锥壳靶型在间接驱动条件下的预热情况进行了实验研究。结果表明,越厚的锥顶受X射线预热的影响越小。采用了5μm和10μm两种锥顶,其锥顶平面的预热速度最大分别为2.2km/s和0.6km/s,而其产生预热的时刻基本上与主激光峰值时刻一致。实验中获得了丰富细节的条纹图像,揭示了金锥在预热过程中的物理现象,表明成像型VISAR可以为自由面低速测量及快点火锥壳靶物理实验提供诊断基础。
This paper reports the application of imaging arbitrary reflection surface velocity interferometer (VISAR) in the fast preheating experiment of the conical shell target, and studies the preheating conditions of different gold cone target models under the indirect driving condition. The results show that the thicker cone top is less affected by X-ray preheating. The pyramidal tops of 5μm and 10μm are used. The maximum preheating velocities of the conical top planes are 2.2km / s and 0.6km / s respectively, and the preheating time is basically the same as the main laser peak time. The fringe images with rich details were obtained and the physical phenomena of gold cone in the process of preheating were revealed. It is shown that the imaging VISAR can provide the diagnostic basis for low-velocity free-surface measurement and rapid fire cone experiment.