High energy conversion efficiency in laser-proton acceleration by controlling laser-energy deposition onto thin foil targets
High energy conversion efficiency in laser-proton acceleration by controlling laser-energy deposition onto thin foil targets
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DOI：
10.1063/1.4865812
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发表时间：
2014-02-24
影响因子：
4
通讯作者：
Neely, D.
中科院分区：
文献类型：
--
作者：
Brenner, C. M.;Robinson, A. P. L.;Neely, D.
利用最简单的靶设计，研究了一种增强激光-质子加速的全光学方法，以演示激光和质子之间能量转换效率的应用相关水平。结合薄箔靶，研究了双脉冲时间包络形式的激光能量的控制沉积，其中激光加速的电子的再循环可以导致激光驱动能量耦合到质子束的最佳条件。与单脉冲照射相比，这种方法在激光能量与5-30 MeV质子的耦合方面有了显著的增强，达到了创纪录的15%的转换效率，两个脉冲和5微米厚的金箔之间的时间间隔为1ps。一维模拟代码被用来支持和解释观测到的类似于1ps的最佳脉冲间隔的起源。(C)2014年作者(S)。除另有说明外，所有文章内容均按照知识共享署名3.0未移植许可进行许可。
An all-optical approach to laser-proton acceleration enhancement is investigated using the simplest of target designs to demonstrate application-relevant levels of energy conversion efficiency between laser and protons. Controlled deposition of laser energy, in the form of a double-pulse temporal envelope, is investigated in combination with thin foil targets in which recirculation of laser-accelerated electrons can lead to optimal conditions for coupling laser drive energy into the proton beam. This approach is shown to deliver a substantial enhancement in the coupling of laser energy to 5-30 MeV protons, compared to single pulse irradiation, reaching a record high 15% conversion efficiency with a temporal separation of 1 ps between the two pulses and a 5 mu m-thick Au foil. A 1D simulation code is used to support and explain the origin of the observation of an optimum pulse separation of similar to 1 ps. (C) 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.