Reprint Server

Computational and Experimental Characterization of High-Brightness Beams for Femtosecond Electron Imaging and Spectroscopy

Abstract

Using a multilevel fast multipole method, coupled with the shadow imaging of femtosecond photoelectron pulses for validation, we quantitatively elucidate the photocathode, space charge, and virtual cathode physics, which fundamentally limit the spatiotemporal and spectroscopic resolution and throughput of ultrafast electron microscope (UEM) systems. We present a simple microscopic description to capture the nonlinear beam dynamics based on a two-fluid picture and elucidate an unexpected dominant role of image potential pinning in accelerating the emittance growth process. These calculations set theoretical limits on the performance of UEM systems and provide useful guides for photocathode design for high-brightness electron beam systems.

J. Portman, H. Zhang, Z. Tao, K. Makino, M. Berz, P.M. Duxbury, C.-Y. Ruan, Applied Physics Letters 103 (2013) 253115

Download

Click on the icon to download the corresponding file.

Download Adobe PDF version (1409775 Bytes).

Go Back to the reprint server.
Go Back to the home page.

This page is maintained by Kyoko Makino. Please contact her if there are any problems with it.