Making a high-quality beam of high-energy electrons starts with an electron gun: It knocks electrons out of atoms with a laser beam so they can be accelerated to nearly the speed of light for ...

A miniature electron gun driven by Terahertz radiation: An ultraviolett pulse (blue) back-illuminates the gun photocathode, producing a high density electron bunch inside the gun. The bunch is ...

Question(s), as someone uneducated in imaging disciplines: the article mentions a "temporal resolution" in the femtosecond range. I wasn't aware that temporal resolution mattered for images in any ...