Neutron Temporal Diagnostic and Analysis for in Inertial Confinement Fusion Experiment on Shen Guang-III Prototype Laser Facility

Fusion reaction rate is an important parameter for measuring compression during the implosion in inertial confinement fusion experiment. We have developed a system for fusion reaction history measurement with high temporal resolution. The detector is based on the fast rise time of a commercial plastic scintillator (EJ-232) and has a response <30 ps. A thin piece of scintillator material acts as a neutron-to-light converter. A simultaneously recorded optical fiducial pulse allows the streak camera time base to be calibrated relative to the incident laser power. We have applied this system on the Shen Guang- Ⅲ (SG-III) prototype laser facility for fusion reaction rate measuring. Fusion reaction rate history has been measured for the first time with deuterium-tritium filled targets under neutrons yields about 10 10 . We have anatomized possible influence factor during fusion reaction rate measuring. The relationship of the roughness degree of ablation shell and the two peaks of fusion reaction rate has been analyzed. The two peaks of reaction rate can be obtained from the simulation results. The two peaks of reaction rate have been confirmed with the experimental results. We found that neutrons yields in our experiment generated by the first peak which is called the shock peak. The simulation and experimental results has provided the strong technique support for the research on fusion reaction rate in inertial