Initial indirect cone-in-shell fast ignition integrated experiment on Shengguang Ⅱ-updated facility
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摘要: 在神光Ⅱ升级装置上完成了国际上首次间接驱动快点火集成实验。实验采用双台阶脉冲整形激光注入黑腔产生X射线准等熵压缩锥壳靶,实现了高密度压缩,然后采用皮秒超短脉冲激光注入加热燃料。实验中观测到中子产额由皮秒激光注入前的5103增加到2.2105,中子产额增益达到44倍,实验证实了皮秒激光具有明显燃料加热效果。该实验为进一步开展快点火热斑形成效率和相关物理研究奠定了基础。Abstract: Initial indirect cone-in-shell fast ignition integrated experiment was carried out on Shenguang Ⅱ-updated laser facility. The shaped laser pulses were injected into a hohlraum to compress a cone-in-shell target and achieve a higher density. Then a picosecond laser with hundreds joules energy was guided by a golden cone to irradiate the tip of the cone and generate hot electron flux to heat the compressed deuterium fuel. A maximum neutron yield of 2.2105 was observed at a suitable injection timing of the picosecond laser, which is 44 times larger than that with no picosecond laser injection. These experiment results confirm the heating effect of the picosecond igniting laser.
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Key words:
- laser fusion /
- fast ignition /
- integrated experiment /
- neutron yield
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