激光驱动爆推靶特性研究

IMPLOSION PERFORMANCE OF LASER DRIVEN EXPLODING PUSHER TARGETS

  • 摘要: 在神光装置上进行了爆推型DT气体的玻璃微球内爆实验。产生了5×中子:内爆芯DT密度约一倍液D2密度:内爆对称性4—8%:内爆速度3.3×10cm/s:内爆时间约150Ps:能量吸收系数约25%。实验结果与“一次冲击等熵压缩”理论符合得比较好

     

    Abstract: Experimental and theoretical studies of the implosion performance of laser-driven exploding pusher targets are presented in this paper.Typically,exploding pusher targets consist of a glass microballoon with D-T gas.Target dimensions used for the 1TW laser facility are 50μm in radius.0.5μm in thickness and 10 atm io D-T feul pressure.The LF-12 laser facility deliver about 2TW in two beams.The la.ser energy was E1=50-100J.Pulse duration r=80-105ps.The sychronous time of the two beams was ± 10ps with their energy symmetry within ±14%.To characterize implosion processes as completely as possible,a great veriety of plasma diagnostics were employed.The experimental results of Laser-induced implosion are as follow s:Thermonuclear neutron vields are 5×106 ±20% pulse.The D-T fuel density of compressed core is about 1 ×liquid D2 density.The symmetry of implosion is 4%-8%.with a implosion velocity of 3.3 × 10-± 50% cm.s.and a implosion time of 150ps±40ps.The absorption efficiency is 28%± 6%.

     

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