Summary of Working Group 3: Laser and High-Gradient Structure-Based Acceleration

High-gradient particle acceleration with reduced power demands is essential for miniaturization and cost reduction of future accelerators. Working Group 3 discussed and surveyed the recent advances in achieving higher gradients and better acceleration efficiency in externally powered, structure-based accelerators. The working group was organized as a survey of the different schemes and the relevant associated techniques and structures as a function of frequency, all the way from radiofrequency (RF) bands to infrared and visible lasers. Other relevant topics such as power sources or electron beam sources peculiar of a given frequency range were also discussed. Further details on each of these topics can be found in the respective papers in these Proceedings.