Hyeri Lee

TL;DR: In this paper, the authors report on the generation of cold electron beams using a photocathode grown by codeposition of Sb and Cs and demonstrate a significant reduction in the mean transverse energy validating the long-standing speculation that the lattice temperature contributes to limiting the photoemission threshold, opening new frontiers in generating ultrabright beams.

Abstract: Managing parallel cryogenic flows has become a key challenge in designing efficient and smart cryo-modules for particle accelerators. In analysing the heating dynamics of the Cornell high current injector module a computational tool has been set-up allowing time resolved analysis and optimization. We describe the computational methods and data sets we have used, report the results and compare them to measured data from the module being in good agreement. Mitigation strategies developed on basis of this model have helped us in pushing the operational limitations.

TL;DR: In this paper, the authors presented a new design of a compact electron DC high voltage (HV) gun with a novel cryogenic photocathode system and report on construction and commissioning processes.

TL;DR: In this article, the authors explore the utilization of a cathode fieldenhancing micron-scale tip inside a dc gun to obtain brighter sub-pC electron beams using a nominal cathode electric field of 10 MV/m, and peak tip emission fields up to ∼ 100 M/m.