Proceedings of the Advanced Accelerator Concepts Seminar Series 2020

The Advanced Accelerator Concepts (AAC) Seminar Series 2020 (this https URL), organized and hosted by the Lawrence Berkeley National Laboratory, consisted of nine weekly sessions, each one dedicated to a particular topic of interest within the framework of advanced accelerator concepts research. The Seminar Series was a fully-remote event that provided a forum for the advanced accelerator community. The AAC Seminar Series was held in lieu of the AAC 2020 Workshop (this https URL), originally planned for June 2020 and canceled due to the COVID-19 pandemic. Since its inception in 1982, the biennial AAC Workshop has become the principal US and international meeting for advanced particle accelerator research and development.