Traveling wave tube

From Glossary of Meteorology



traveling wave tube[edit | edit source]

(Abbreviated TWT.) A linear beam amplifier tube used in medium-power radar transmitters.

In a TWT, a stream of electrons interacts continuously or repeatedly with a guided electromagnetic wave moving substantially in synchronism with it and in such a way that there is a net transfer of energy from the stream to the wave. A TWT is characterized by high bandwidth but has somewhat lower gain, power, and efficiency than a klystron.


  1. A collimated source of electromagnetic radiation (e.g., a laser beam).
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