Temporal and lateral electron pulse compression by a compact spherical electrostatic capacitor

作     者：Grzelakowski, Krzysztof P. Tromp, Rudolf M. 

作者机构：OPTICON Nanotechnol PL-54424 Wroclaw Poland IBM Corp Thomas J Watson Res Ctr Div Res Yorktown Hts NY 10598 USA 

出 版 物：《ULTRAMICROSCOPY》 (Ultramicroscopy)

年 卷 期：2013年第130卷

页      面：36-43页

核心收录：

学科分类：07[理学] 08[工学] 0804[工学-仪器科学与技术] 

主　　题：UED DTEM Electron pulse compression 4D diffraction 4D microscopy 

摘      要：A novel solution for high intensity electron pulse compression in both space and time is proposed in this paper. Based on the unique properties of the central-force electrostatic field of a spherical electrostatic capacitor, the newly developed alpha-Spherical Deflector Analyzer (alpha-SDA) with 2 pi total deflection is utilized for the practical realization of femtosecond electron pulse compression. The mirror symmetry of the system at pi deflection causes not only the cancellation of the geometrical and chromatic aberrations at 2 pi, but also leads to aberration-free time reversal of the electron pulse in the exit plane. As a consequence, the time-divergent electrons at the input are transformed to a time-convergent pulse at the output. In the symmetric case with the first time compression exactly at pi, the shortest electron pulse behind the alpha-SDA analyzer is a mirror symmetric to the original electron pulse at the photocathode. It results in extremely short final electron pulses that are limited only by the duration of the laser pulse, the emittance of the electron bunch, and by imperfections of the real system. (C) 2013 Elsevier By. All rights reserved.