Maximum Proton Energy above 85 MeV from the Relativistic Interaction of Laser Pulses with Micrometer Thick CH2 Targets
Maximum Proton Energy above 85 MeV from the Relativistic Interaction of Laser Pulses with Micrometer Thick CH2 Targets
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DOI：
10.1103/physrevlett.116.205002
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发表时间：
2016-05-19
影响因子：
8.6
通讯作者：
Bagnoud, V.
中科院分区：
文献类型：
--
作者：
Wagner, F.;Deppert, O.;Bagnoud, V.
本文研究了微米和亚微米厚塑料靶的激光驱动离子加速。使用具有高时间对比度和10（20）W/cm（2）量级的强度的激光脉冲，我们观察到质子束的截止能量超过85 MeV，在该最大值附近的1 MeV能量箱中的粒子数为109。我们表明，应用目标正常鞘层加速机制与亚微米厚的目标是一个非常强大的方式来实现这样高的离子能量和粒子通量。我们的研究结果得到了二维粒子模拟的支持，并根据相对论透明度预测了200 MeV以上的加速截止能量。在对激光器和目标参数进行一些技术上可行的调整后，可以探测到这种预测的机制。
We present a study of laser-driven ion acceleration with micrometer and submicrometer thick plastic targets. Using laser pulses with high temporal contrast and an intensity of the order of 10(20) W/cm(2) we observe proton beams with cutoff energies in excess of 85 MeV and particle numbers of 109 in an energy bin of 1 MeV around this maximum. We show that applying the target normal sheath acceleration mechanism with submicrometer thick targets is a very robust way to achieve such high ion energies and particle fluxes. Our results are backed with 2D particle in cell simulations furthermore predicting cutoff energies above 200 MeV for acceleration based on relativistic transparency. This predicted regime can be probed after a few technically feasible adjustments of the laser and target parameters.