基于神光Ⅲ原型装置的冲击点火分解实验

Resolvability experiments of shock ignition implemented on ShenguangⅢ prototype laser facility

冲击点火是一种新型点火方式,介绍了国内进行的冲击点火分解实验。实验结果表明:相比于方波脉冲,在冲击峰整形脉冲作用下激光与等离子体相互作用明显增强,背向散射光的份额增加,散射光谱来自于不同密度的等离子体区域。实验中也观察到了方波条件下冲击波在CH样品中的传播过程,与模拟计算结果较为符合。

As a novel ignition method, shock ignition has many advantages comparing to fast ignition. The resolvability ex- periments of shock ignition in China implemented on the Shenguang Ⅲ prototype laser facility is put forward in the paper. Based on the shaping ability of the laser pulse of the facility, a shock laser pulse and a square-topped laser pulse are employed as the drive source. This paper introduces the design of the targets and beam smoothing ability of the laser. The main configurations and measurement precision of two typical diagnostic equipment--the back scattering light diagnostic system and imaging VISAR, are also expounded. The main purpose of the experiment focuses on the laser plasma interaction and the generation and transmitting of the shock wave in the CH polymer layer. Experimental results with the energy and spectrum of back scattering light prove that the fraction of back scattering light has risen and mainly been generated in the wider density region of the plasma after using the shock laser pulse. The simulations and experiment results of the main transmitting progress of the shock wave in CH layer agree well with each other.