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Title: A spherical shell target scheme for laser-driven neutron sources

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 CD{sub 2} layer. This also causes efficient yield of neutrons inside the CD{sub 2} layer due to “beam-target” approach. A postprocessor hasmore » been designed to evaluate the neutron yield and the neutron spectrum is obtained.« less
Authors:
; ; ; ;  [1] ; ; ; ; ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Institute of Applied Physics and Computational Mathematics, Beijing 100094 (China)
  2. (China)
  3. School of Physics and Optoelectronic Engineering, Ludong University, Yantai 260405 (China)
  4. Department of Physics, Jiaotong University, Shanghai 200240 (China)
  5. Shanghai Institute of Laser Plasma, Shanghai 201800 (China)
Publication Date:
OSTI Identifier:
22489948
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CAPSULES; CAVITY RESONATORS; CONES; DEUTERIUM; DEUTERIUM IONS; ENERGY CONVERSION; GOLD; LASER RADIATION; MEV RANGE; NEUTRON SOURCES; NEUTRON SPECTRA; NEUTRONS; SPHERICAL CONFIGURATION