Mean Transverse Energy at the Thermal Limit
The Mean Transverse Energy (MTE) of Cs3Sb has been shown to approach the thermal limit at room temperature when illuminated with light at the emission threshold. The emission threshold was observed to be lower than in previous studies.
MTE is the ultimate limit on the achievable brightness of an electron source. If this performance can be replicated in a full injector with a higher QE, it will enable hard X-ray operation of LCLS-II HE.
In summary, this discovery takes a big step towards finding the secret recipe for making brighter and more efficient X-ray sources. It brings us closer to realizing the full potential of advanced X-ray technology, with applications that could range from improving medical imaging to unlocking the secrets of matter at the smallest scales.
A. Kachwala, P. Saha, P. Bhattacharyya, E. Montgomery, O. Chubenko, and S. Karkare, “Demonstration of thermal limit mean transverse energy from cesium antimonide photocathodes,” Applied Physics Letters, vol. 123, no. 4, p. 044106, Jul. 2023, doi: 10.1063/5.0159924. Available: https://doi.org/10.1063/5.0159924