Temporal Narrowing of Neutrons Produced by High-Intensity Short-Pulse Lasers
Temporal Narrowing of Neutrons Produced by High-Intensity Short-Pulse Lasers
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DOI：
10.1103/physrevlett.115.054802
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发表时间：
2015-07-28
影响因子：
8.6
通讯作者：
Fuchs, J.
中科院分区：
文献类型：
--
作者：
Higginson, D. P.;Vassura, L.;Fuchs, J.
研究了用超强激光脉冲产生短持续时间中子束的问题。利用激光触发微透镜对激光加速质子进行光谱过滤，通过在转换器材料（LiF）中诱导的核反应产生短持续时间的中子脉冲。这产生了一个类似于3纳秒持续时间的中子脉冲与10（4）n/MeV/sr/射击在0.56米的激光照射质子源。中子产生和质子源之间的大空间分离允许屏蔽由激光-等离子体相互作用产生的大量和不期望的辐射。这种中子脉冲与传统加速器源的持续时间相比是有利的，并且应该与现在和未来的更高能量的激光设施一起扩大，以产生更亮和更短的中子束，用于致密材料的超快探测。
The production of neutron beams having short temporal duration is studied using ultraintense laser pulses. Laser-accelerated protons are spectrally filtered using a laser-triggered microlens to produce a short duration neutron pulse via nuclear reactions induced in a converter material (LiF). This produces a similar to 3 ns duration neutron pulse with 10(4) n/MeV/sr/shot at 0.56 m from the laser-irradiated proton source. The large spatial separation between the neutron production and the proton source allows for shielding from the copious and undesirable radiation resulting from the laser-plasma interaction. This neutron pulse compares favorably to the duration of conventional accelerator sources and should scale up with, present and future, higher energy laser facilities to produce brighter and shorter neutron beams for ultrafast probing of dense materials.