High brilliant and high current photo-induced electron sources: photocathodes and rf field

• Applicant: Dr. Rong Xiang
• Subject Area: Nuclear and Elementary Particle Physics, Quantum Mechanics, Relativity, Fields ; Experimental Condensed Matter Physics ; Physical Chemistry of Solids and Surfaces, Material Characterisation
• Term: from 2017 to 2020
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 387800141

For accelerator-based THz radiation sources, high power free-electron lasers (FELs) and light sources driven by Energy Recovery Linacs (ERL) the development of suitable electron sources with high bunch charge in continuous wave (CW) mode is one of the most challenging tasks. A high efficient and robust photocathode is one of the key-components in any type photoinjector, und suitable accelerating structures with high gradient on cathode are always a hot topic for the gun designers. However, the coaction between cathode emission and field effects in immediate vicinity of the photocathodes has not been fully understood. More accurate modeling of beam generation process needs to be carried out in QE-limited and space-charge limited regimes, respectively. In this proposed networking, the close interaction of specialists in different fields, such as accelerator physics, material science, surface physics and radio-frequency theory, can build an outstanding research platform for high QE photo cathode materials (GaN and Bialkali semiconductors) in high rf field. not only the experimental results but also the theoretical studies of the photoemission process in rf fields will be discussed. The across-location and cross-field networking will offer the possibility to perform interdisciplinary research, to exchange the ideas about the potential problems in the common interest and to search the optimal solutions. Meanwhile this networking will also take a significant role in the education of students and young scientists by widening their vision and accumulating experience.

• DFG Programme: Scientific Networks