中国物理B ›› 2009, Vol. 18 ›› Issue (2): 537-541.doi: 10.1088/1674-1056/18/2/025

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Nuclear fusion from Coulomb explosions of deuterated methane clusters subjected to ultraintense femtosecond laser pulses

Kim Cheol-Jung1, 卢海洋2, 王成2, 陈光龙2, 刘建胜2, 倪国权2, 李儒新2, 徐至展2   

  1. (1)Korea Atomic Energy Research Institute, Yusung, Taejon 305-353, Korea; (2)State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 收稿日期:2008-04-21 修回日期:2008-06-26 出版日期:2009-02-20 发布日期:2009-02-20
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No 2006CB806000) and the National Natural Science Foundation of China (Grant No 10535070).

Nuclear fusion from Coulomb explosions of deuterated methane clusters subjected to ultraintense femtosecond laser pulses

Lu Hai-Yang(卢海洋)a), Wang Cheng(王成)a), Chen Guang-Long(陈光龙)a), Kim Cheol-Jungb), Liu Jian-Sheng(刘建胜)a), Ni Guo-Quan(倪国权)a)†, Li Ru-Xin(李儒新)a)‡, and Xu Zhi-Zhan(徐至展)a)   

  1. a State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; b Korea Atomic Energy Research Institute, Yusung, Taejon 305-353, Korea
  • Received:2008-04-21 Revised:2008-06-26 Online:2009-02-20 Published:2009-02-20
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No 2006CB806000) and the National Natural Science Foundation of China (Grant No 10535070).

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摘要： This paper reports that Coulomb explosions taken place in the experiment of heteronuclear deuterated methane clusters ((CD4)2) in a gas jet subjected to intense femtosecond laser pulses (170mJ, 70fs) have led to table-top laser driven DD nuclear fusion. The clusters produced in supersonic expansion had an average size of about 5nm in radius and the laser intensity used was 3×1017W/cm2.The measured maximum and average energies of deuterons produced in the laser--cluster interaction were 60 and 13.5keV, respectively. From DD collisions of energetic deuterons, a yield of 2.5(±0.4)×104 fusion neutrons of 2.45MeV per shot was realized, giving rise to a neutron production efficiency of about 1.5×105 per joule of incident laser pulse energy. Theoretical calculations were performed and a fairly good agreement of the calculated neutron yield with that obtained from the present experiment was found.

关键词: molecular clusters, Coulomb explosion, DD nuclear fusion, intense femtosecond lasers

Abstract: This paper reports that Coulomb explosions taken place in the experiment of heteronuclear deuterated methane clusters ((CD4)n) in a gas jet subjected to intense femtosecond laser pulses (170mJ, 70fs) have led to table-top laser driven DD nuclear fusion. The clusters produced in supersonic expansion had an average size of about 5nm in radius and the laser intensity used was 3×1017W/cm2.The measured maximum and average energies of deuterons produced in the laser--cluster interaction were 60 and 13.5keV, respectively. From DD collisions of energetic deuterons, a yield of 2.5(±0.4)×104 fusion neutrons of 2.45MeV per shot was realized, giving rise to a neutron production efficiency of about 1.5×105 per joule of incident laser pulse energy. Theoretical calculations were performed and a fairly good agreement of the calculated neutron yield with that obtained from the present experiment was found.

Key words: molecular clusters, Coulomb explosion, DD nuclear fusion, intense femtosecond lasers

中图分类号:  (Fusion reactions)

  • 25.60.Pj
52.50.Jm (Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)) 25.45.-z (2H-induced reactions) 27.10.+h (A ≤ 5)