Noun
travelling wave tube (plural travelling wave tubes)
Alternative spelling of travelling-wave tube
travelling-wave tube (plural travelling-wave tubes)
(electronics) A type of vacuum tube which amplifies electromagnetic signals, where the electron gun fires down the tube with an unmodulated electron beam, that passes through an interaction array, where the EM-signal is fed, which interacts with the electron beam, bunching the electrons, and transferring power to the signal.
travelling-wave tube