1) Energy weapon 2) Vacuum tube
Found on
https://www.crosswordclues.com/clue/vircator
A vircator (VIRtual CAthode oscillaTOR) is a microwave generator that is capable of generating brief pulses of tunable, narrow band microwaves at very high power levels. A typical vircator is built inside an evacuated resonant cavity or waveguide. An electrode, a cold cathode, at one end injects an intense electron beam, such as from a Marx genera...
Found on
http://en.wikipedia.org/wiki/Vircator
No exact match found.
