Speaker
Margarita Bulgacheva
(Technical University Darmstadt)
Description
We develop a simulation framework for nanostructured photocathodes that combines electromagnetic modeling, spatially resolved photoemission with Schottky correction, and particle-in-cell beam dynamics.
Nanostructured metallic photocathodes offer enhanced quantum efficiency through surface-plasmon excitation that leads to increased absorptance. For plasmonic copper cathodes at UV, the results show increased quantum efficiency, but however, with a degradation of beam quality, including up to a 1.5-fold increase in normalized emittance and higher energy spread.
The approach is general and can be extended to other metallic materials. Semiconductor photocathodes are also considered as a possible extension.
Author
Margarita Bulgacheva
(Technical University Darmstadt)