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A spherical shell target scheme for laser-driven neutron sources

Author:
He, Min-Qing  Cai, Hong-Bo  Zhang, Hua  Dong, Quan-Li  Zhou, Cang-Tao  Wu, Si-Zhong  Sheng, Zheng-Ming  Cao, Li-Hua  Zheng, Chun-Yang  Wu, Jun-Feng  Chen, Mo  Pei, Wen-Bing  Zhu, Shao-Ping  He, X. T.  


Journal:
PHYSICS OF PLASMAS


Issue Date:
2015


Abstract(summary):

A scheme for neutron production is investigated in which an ultra-intense laser is irradiated into a two-layer (deuterium and aurum) spherical shell target through the cone shaped entrance hole. It is found that the energy conversion efficiency from laser to target can reach as high as 71%, and deuterium ions are heated to a maximum energy of several MeV from the inner layer surface. These ions are accelerated towards the center of the cavity and accumulated finally with a high density up to tens of critical density in several picoseconds. Two different mechanisms account for the efficient yield of the neutrons in the cavity: (1) At the early stage, the neutrons are generated by the high energy deuterium ions based on the "beam-target" approach. (2) At the later stage, the neutrons are generated by the thermonuclear fusion when the most of the deuterium ions reach equilibrium in the cavity. It is also found that a large number of deuterium ions accelerated inward can pass through the target center and the outer Au layer and finally stopped in the CD2 layer. This also causes efficient yield of neutrons inside the CD2 layer due to "beam-target" approach. A postprocessor has been designed to evaluate the neutron yield and the neutron spectrum is obtained. (C) 2015 AIP Publishing LLC.


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