低发射度、高亮度相对论电子束源于激光等离子体加速器。

Low emittance, high brilliance relativistic electron beams from a laser-plasma accelerator.

机构信息

Physics Department, University of Strathclyde, Glasgow G4 0NG, United Kingdom.

出版信息

Phys Rev Lett. 2010 Nov 19;105(21):215007. doi: 10.1103/PhysRevLett.105.215007.

DOI:10.1103/PhysRevLett.105.215007

Abstract

Progress in laser wakefield accelerators indicates their suitability as a driver of compact free-electron lasers (FELs). High brightness is defined by the normalized transverse emittance, which should be less than 1π mm mrad for an x-ray FEL. We report high-resolution measurements of the emittance of 125 MeV, monoenergetic beams from a wakefield accelerator. An emittance as low as 1.1±0.1π mm mrad is measured using a pepper-pot mask. This sets an upper limit on the emittance, which is comparable with conventional linear accelerators. A peak transverse brightness of 5×10¹⁵ A m⁻¹ rad⁻¹ makes it suitable for compact XUV FELs.

摘要

激光尾波场加速器的发展表明其适合作为紧凑型自由电子激光（FEL）的驱动器。高亮度由归一化横向发射度定义，对于 X 射线 FEL，其应小于 1π mm mrad。我们报告了来自尾波场加速器的 125 MeV 单能束的高分辨率发射度测量结果。使用胡椒罐掩模测量到的发射度低至 1.1±0.1π mm mrad。这是对发射度的上限测量，与传统线性加速器相当。峰值横向亮度为 5×10¹⁵ A m⁻¹ rad⁻¹，使其适合紧凑型 XUV FEL。