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Department High Brightness Beams

Photocathode R&D

for Electron Accelerators

bERLinPro photocathode infrastructure - enlarged view

bERLinPro photocathode infrastructure

The beam quality of a SRF photoinjector in terms of brightness and current is ultimately given by the electron source itself. In an SRF photoinjector electrons are generated by illuminating a photocathode with light pulses from a drive laser. This photocathode must be embedded into the SRF cavity,such that the electrons can be quickly accelerated to mitigate space charge effects. The focus of the activities is to understand correlations between cathode material, preparation, treatment and electron beam parameters such as transverse emittance, which is linked to the brightness of the beam generated with the SRF photoinjector. Our goal is to provide high quantum efficiency Cs-K-Sb photocathodes for the operation of bERLinPro and beyond that to understand fatigue effects and fundamental electronic and optical properties in collaboration with Prof. C. Cocchi from U Oldenburg.

Teamleader Photocathode R&D: Dr. Sonal Mistry  ResearchGate & Dr. Julius Kühn   ResearcherID  JACoW 


  1. C. Cocchi et al., Electronic structure and core electron fingerprints of caesium-based multi-alkali antimonides for ultra-bright electron sources, Scientific Reports, 9, 18276, (2019). SR
  2. M. A. H. Schmeißer et al., Towards the operation of Cs-K-Sb photocathodes in superconducting rf photoinjectors, Phys. Rev. Accel. Beams 21, 113401, (2018). PRAB
  3. C. Cocchi et al., First-principles many-body study of the electronic and optical properties of CsK2Sb, a semiconducting material for ultra-bright electron sources, J. Phys.: Condens. Matter, 31, 014002, (2018). JPCM