激光尾场加速电子产生的电子感应加速器辐射的光谱学

Spectroscopy of betatron radiation emitted from laser-produced wakefield accelerated electrons.

作者信息

Thorn D B, Geddes C G R, Matlis N H, Plateau G R, Esarey E H, Battaglia M, Schroeder C B, Shiraishi S, Stöhlker Th, Tóth C, Leemans W P

机构信息

ExtreMe Matter Institute, 64291 Darmstadt, Germany.

出版信息

Rev Sci Instrum. 2010 Oct;81(10):10E325. doi: 10.1063/1.3479118.

DOI:10.1063/1.3479118

PMID:21034023

Abstract

X-ray betatron radiation is produced by oscillations of electrons in the intense focusing field of a laser-plasma accelerator. These hard x-rays show promise for use in femtosecond-scale time-resolved radiography of ultrafast processes. However, the spectral characteristics of betatron radiation have only been inferred from filter pack measurements. In order to achieve higher resolution spectral information about the betatron emission, we used an x-ray charge-coupled device to record the spectrum of betatron radiation, with a full width at half maximum resolution of 225 eV. In addition, we have recorded simultaneous electron and x-ray spectra along with x-ray images that allow for a determination of the betatron emission source size, as well as differences in the x-ray spectra as a function of the energy spectrum of accelerated electrons.

摘要

X射线电子感应加速器辐射是由电子在激光等离子体加速器的强聚焦场中振荡产生的。这些硬X射线有望用于超快过程的飞秒级时间分辨射线照相。然而，电子感应加速器辐射的光谱特性仅通过滤光片组测量推断得出。为了获得关于电子感应加速器发射的更高分辨率光谱信息，我们使用了X射线电荷耦合器件来记录电子感应加速器辐射的光谱，其半高宽分辨率为225电子伏特。此外，我们还记录了同步的电子和X射线光谱以及X射线图像，这些图像可以确定电子感应加速器发射源的大小，以及X射线光谱随加速电子能谱的变化。