European Workshop on Photocathodes for Particle Accelerator Applications 2022: Summary Report

Abstract: The European Workshop on Photocathodes for (particle) Accelerator Applications (EWPAA) brings together experts in the field of photocathode based electron sources for use in particle accelerators, with the aim of sharing their knowledge and latest research and development progress in this crucial field of particle accelerator science. The workshop is convened every other year, and is thus complementary to the P3 workshop (Photocathode Physics for Particle accelerators) run in the USA. Consequently, there is a workshop focusing on photocathodes for particle accelerator applications convened every year, either in Europe or the USA. The EWPAA 2022 is the 4th meeting in this workshop series. The event was hosted by the INFN LASA Institute in Milan in collaboration with University of Milano between September 20th and 22nd. The programme was organised with 7 working groups, with each oral contribution assigned to the most appropriate group. This report presents, summarised by the work group conveners, the innovative ideas, the challenges and the main points raised by each of the speakers.