A common issue encountered in photoemission electron sources used in electron accelerators is the transverse inhomogeneity of the laser distribution resulting from the laser-amplification process and often use of frequency up conversion in nonlinear crystals. A inhomogeneous laser distribution on the photocathode produces charged beams with lower beam quality. In this paper, we explore the possible use of microlens arrays (fly-eye light condensers) to dramatically improve the transverse uniformity of the drive laser pulse on UV photocathodes. We also demonstrate the use of such microlens arrays to generate transversely-modulated electron beams and present a possible application to diagnose the properties of a magnetized beam.
@article{arxiv.1707.08448,
title = {Spatial Control of Photoemitted Electron Beams using a Micro-Lens-Array Transverse-Shaping Technique},
author = {A. Halavanau and G. Qiang and G. Ha and E. Wisniewski and P. Piot and J. G. Power and W. Gai},
journal= {arXiv preprint arXiv:1707.08448},
year = {2017}
}
Comments
arXiv admin note: text overlap with arXiv:1609.01661