Field assisted photoemission DC-pulsed cathode for 5th generation light sources and accelerators theoretical study

The scope of that contribution is to present the challenges of the next particle sources for accelerators. It is admitted
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that emittance near Interaction Point (IP) is strongly dominated by the emittance of the low power source. To minimize the Bremstrahlung effects in the Interaction Point (IP), we also need extremely low emittance bunches, ultra high brillance, very low charges sub fC, near depopulated attosecond electronic bunches. These produced bunches should fit the entrances of Dielectric Laser Accelerators (DLA) and Laser Plasma Accelerators (LPA).