Quasi-monoenergetic positron beam generation from ultra-intense laser-matter interactions
Quasi-monoenergetic positron beam generation from ultra-intense laser-matter interactions
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DOI：
10.1063/1.4965914
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发表时间：
2016-10
影响因子：
2.2
通讯作者：
Tatsufumi Nakamura;T. Hayakawa
中科院分区：
文献类型：
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作者：
Tatsufumi Nakamura;T. Hayakawa
在超强激光与物质的相互作用中，辐射反应效应起着重要作用，有效地产生了强烈的、准直的、持续时间短的γ射线。这些γ射线穿过靶，这导致由γ射线与核电场的相互作用引起的电子-正电子对的产生。由此产生的正电子束具有几个独特的特征;它本质上是准单能的，峰值能量为数百MeV，准直良好，持续时间极短。在数值模拟的基础上，探讨了正电子的数量和单色性与激光和靶参数的关系，提出了一种新型的激光驱动正电子源。
In ultra-intense laser-matter interactions in which the radiation reaction effect plays an important role, γ-rays are effectively generated that are intense, collimated, and of short duration. These γ-rays propagate through the target, which results in the electron-positron pair creation caused by the interaction of the γ-rays with the nuclear electric fields. The positron beam thus generated has several unique features; it is quasi-monoenergetic in nature with a peak energy of hundreds of MeV, well collimated, and of ultra-short duration. Based on the numerical simulations, the dependences of the number and monochromaticity of the positrons on the laser and target parameters are explored, which leads to the proposal of a new type of the laser-driven positron source.