Experimental demonstration of a compact epithermal neutron source based on a high power laser
Experimental demonstration of a compact epithermal neutron source based on a high power laser
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DOI：
10.1063/1.4994161
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发表时间：
2017-07
影响因子：
4
通讯作者：
S. R. Mirfayzi;A. Alejo;H. Ahmed;D. Raspino;S. Ansell;L. Wilson;C. Armstrong;N. M. H. Butler;R. Clarke;A. Higginson;J. Kelleher;C. Murphy;M. Notley;D. Rusby;E. Schooneveld;M. Borghesi;P. McKenna;N. Rhodes;D. Neely;C. Brenner;S. Kar
中科院分区：
文献类型：
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作者：
S. R. Mirfayzi;A. Alejo;H. Ahmed;D. Raspino;S. Ansell;L. Wilson;C. Armstrong;N. M. H. Butler;R. Clarke;A. Higginson;J. Kelleher;C. Murphy;M. Notley;D. Rusby;E. Schooneveld;M. Borghesi;P. McKenna;N. Rhodes;D. Neely;C. Brenner;S. Kar
来自脉冲散裂源的超热中子使中子科学发生了革命性的变化，使科学家能够对物质的结构和性质有新的认识。在这里，我们证明了激光驱动的快中子(∼MeV)可以被有效地慢化到具有本质上较短爆发持续时间的超热能量。在使用100TW激光的原理验证实验中，测量到了在0.5-300 eV能量范围内由部署在激光驱动快中子源下游的紧凑慢化器产生的约105n/sr/脉冲的显著超热中子通量。活动中使用的慢化剂是在MCNPX模拟的帮助下专门设计的，用于有效和定向地慢化由激光驱动的源产生的快中子谱。
Epithermal neutrons from pulsed-spallation sources have revolutionised neutron science allowing scientists to acquire new insight into the structure and properties of matter. Here, we demonstrate that laser driven fast (∼MeV) neutrons can be efficiently moderated to epithermal energies with intrinsically short burst durations. In a proof-of-principle experiment using a 100 TW laser, a significant epithermal neutron flux of the order of 105 n/sr/pulse in the energy range of 0.5–300 eV was measured, produced by a compact moderator deployed downstream of the laser-driven fast neutron source. The moderator used in the campaign was specifically designed, by the help of MCNPX simulations, for an efficient and directional moderation of the fast neutron spectrum produced by a laser driven source.