Measurement of fusion reaction bang time with high temporal resolution
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摘要: 聚变反应峰值时刻是表征惯性约束聚变热核反应的重要参数。在神光Ⅲ原型装置上利用新研制的具有高时间分辨的聚变反应历程测量系统对聚变反应时间过程进行了测量，通过引入时标光获得了对应不同碳氢（CH）烧蚀层厚度的聚变反应峰值时刻数据，测量结果表明：在当前的实验条件下，聚变反应峰值时刻落后入射激光0.7~1.0 ns，增加烧蚀层厚度或氘氚（DT）燃料气压均会导致聚变反应峰值时刻与入射激光间的相对延时增加。Abstract: Fusion reaction bang time is an important parameter for measuring compression during the implosion in inertial confinement fusion experiment. A system for fusion reaction bang time measurement with high temporal resolution was developed at the SG-Ⅲ prototype. Through the introduction of timing fiducial, the fusion reaction bang time for different CH ablation layer thickness was obtained. For the first time, fusion reaction bang time was measured for deuterium-tritium (DT) filled targets. The results indicate that the fusion reaction bang time is 0.7~1.0 ns after laser pulses, and increasing the thickness of CH or the pressure of DT gas leads to delay of the fusion reaction bang time.
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