Lateral movement of a laser-accelerated proton source on the target's rear surface
Lateral movement of a laser-accelerated proton source on the target's rear surface
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DOI：
10.1103/physreve.77.036407
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发表时间：
2008-03-01
影响因子：
2.4
通讯作者：
Sandner, Wolfgang
中科院分区：
文献类型：
--
作者：
Nakamura, Tatsufumi;Mima, Kunioki;Sandner, Wolfgang
研究了高对比度和超强激光脉冲照射目标后表面质子加速的空间依赖性。观察到后表面质子加速位置的横向运动；这是通过双针孔测量来验证的，结果是观察到具有窄能带的质子。这种漂移只有在相对论强度的激光脉冲以斜入射的方式照射具有小的预等离子体的目标时才会观察到，这一点通过二维粒子在细胞内的模拟得到了证实。这种质子被快速移动的护套场加速的情况导致加速质子的能量选择作为观测位置的函数。
The spatial dependence of proton acceleration at the rear surface of a target that is irradiated by high-contrast and ultraintense laser pulses is investigated. Lateral movement of the proton acceleration position at the rear surface is observed; this is tested by a two-pinhole measurement which results in the observation of protons with a narrow energy band. This drifting is only observed when relativistic-intensity laser pulses irradiate targets with a small preplasma at oblique incidence, as is confirmed by two-dimensional particle-in-cell simulations. This scenario of proton acceleration by the fast-moving sheath field leads to energy selection of the accelerated protons as a function of observing position.