Advances in materials science have improved the composition of materials used in photocathode production that can operate at visible wavelengths and produce a beam with reduced transverse electron momentum spread; however, the surface roughness of the photocathode continues to limit beam properties. Researchers created computer models to bridge the gap to provide a better picture of the physics at the surface of the photocathode.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2017/10/171025140458.htm
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