Neutron production by 200 mJ ultrashort laser pulses
Neutron production by 200 mJ ultrashort laser pulses
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DOI：
10.1103/physreve.58.1165
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发表时间：
1998-07-01
影响因子：
2.4
通讯作者：
Witte, KJ
中科院分区：
文献类型：
--
作者：
Pretzler, G;Saemann, A;Witte, KJ
本文报道了在200 mJ，160 fs钛宝石激光脉冲作用于氘代聚乙烯靶上的d（d，n）He-3聚变反应中产生的rf：LEASE中子的观测结果。通过施加一个定义明确的预脉冲来优化快速电子和离子的产生，导致每次发射140个中子的平均速率。此外，可以观察到大量MeV伽马射线的产生。中子和γ射线的产生归因于激光焦点中相对论等离子体通道的形成和爆炸，数值计算证实了这一点。
We report the observation of neutrons rf:leased from d(d,n) He-3 fusion reactions in the focus of 200 mJ, 160 fs Ti:sapphire laser pulses on a deuterated polyethylene target. Optimizing the fast electron and ion generation by applying a well-defined prepulse led to an average rate of 140 neutrons per shot. Furthermore, the production of a substantial number of MeV gamma rays could be observed. The occurrence of neutrons and gamma rays is attributed to the formation and explosion of a relativistic plasma channel in the laser focus, which is confirmed by numerical calculations.