As a workshop organized for Snowmass, the workshop will address the following charges:
What are the needs/required properties for the electron beams for different applications?
What is needed to advance the physics of electron sources including cathodes, guns and injectors?
What is currently available (state of the art) around the world?
What are the emerging physics concepts and technologies?
What R&D would enable these future opportunities?
What new test facilities could be available or will be required in the next decade (or next next decade)?