Apiñaniz J I, Malko S, Fedosejevs R, Cayzac W, Vaisseau X, de Luis D, Gatti G, McGuffey C, Bailly-Grandvaux M, Bhutwala K, Ospina-Bohorquez V, Balboa J, Santos J J, Batani D, Beg F, Roso L, Perez-Hernandez J A, Volpe L
Centro de Laseres Pulsados (CLPU), Parque Cientifico, 37185, Villamayor, Salamanca, Spain.
Department of Electrical and Computing Engineering, University of Alberta, Edmonton, AB, T6G 2V4, Canada.
Sci Rep. 2021 Mar 25;11(1):6881. doi: 10.1038/s41598-021-86234-x.
We report on the development of a highly directional, narrow energy band, short time duration proton beam operating at high repetition rate. The protons are generated with an ultrashort-pulse laser interacting with a solid target and converted to a pencil-like narrow-band beam using a compact magnet-based energy selector. We experimentally demonstrate the production of a proton beam with an energy of 500 keV and energy spread well below 10[Formula: see text], and a pulse duration of 260 ps. The energy loss of this beam is measured in a 2 [Formula: see text]m thick solid Mylar target and found to be in good agreement with the theoretical predictions. The short time duration of the proton pulse makes it particularly well suited for applications involving the probing of highly transient plasma states produced in laser-matter interaction experiments. This proton source is particularly relevant for measurements of the proton stopping power in high energy density plasmas and warm dense matter.
我们报道了一种高定向性、窄能带、短持续时间且以高重复频率运行的质子束的研发情况。质子由超短脉冲激光与固体靶相互作用产生，并使用基于紧凑型磁体的能量选择器转换为铅笔状窄带束。我们通过实验证明了产生了能量为500 keV且能量展宽远低于10[公式：见原文]、脉冲持续时间为260 ps的质子束。该束在2[公式：见原文]m厚的固态聚酯薄膜靶中测量了能量损失，发现与理论预测吻合良好。质子脉冲的短持续时间使其特别适合用于涉及探测激光与物质相互作用实验中产生的高度瞬态等离子体状态的应用。这种质子源对于测量高能密度等离子体和温稠密物质中的质子阻止本领尤为重要。
