皮秒激光脉冲驱动的自调制激光尾场加速器中电子感应加速器X射线辐射的观测

Observation of Betatron X-Ray Radiation in a Self-Modulated Laser Wakefield Accelerator Driven with Picosecond Laser Pulses.

作者信息

Albert F, Lemos N, Shaw J L, Pollock B B, Goyon C, Schumaker W, Saunders A M, Marsh K A, Pak A, Ralph J E, Martins J L, Amorim L D, Falcone R W, Glenzer S H, Moody J D, Joshi C

机构信息

Lawrence Livermore National Laboratory, NIF and Photon Sciences, 7000 East Avenue, Livermore, California 94550, USA.

Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.

出版信息

Phys Rev Lett. 2017 Mar 31;118(13):134801. doi: 10.1103/PhysRevLett.118.134801.

DOI:10.1103/PhysRevLett.118.134801

PMID:28409970

Abstract

We investigate a new regime for betatron x-ray emission that utilizes kilojoule-class picosecond lasers to drive wakes in plasmas. When such laser pulses with intensities of ∼5×10^{18} W/cm^{2} are focused into plasmas with electron densities of ∼1×10^{19} cm^{-3}, they undergo self-modulation and channeling, which accelerates electrons up to 200 MeV energies and causes those electrons to emit x rays. The measured x-ray spectra are fit with a synchrotron spectrum with a critical energy of 10-20 keV, and 2D particle-in-cell simulations were used to model the acceleration and radiation of the electrons in our experimental conditions.

摘要

我们研究了一种用于电子感应加速器X射线发射的新机制，该机制利用千焦级皮秒激光在等离子体中驱动尾波。当强度约为5×10^{18} W/cm^{2}的此类激光脉冲聚焦到电子密度约为1×10^{19} cm^{-3}的等离子体中时，它们会经历自调制和通道化，这将电子加速到200 MeV的能量，并使这些电子发射X射线。测得的X射线光谱与临界能量为10 - 20 keV的同步加速器光谱相拟合，并使用二维粒子模拟来模拟我们实验条件下电子的加速和辐射。