The Traveling-Wave Tube (TWT) is a high-gain, low-noise, wide-bandwidth microwave amplifier. It is capable of gains greater than 40 dB with bandwidths exceeding an octave. (A bandwidth of 1 octave is ...

Earlier this year, the James-Webb Space Telescope sent back to Earth some of the most detailed images of other galaxies. This was partly due to a Vacuum Electronics Device (VED) called the Travelling ...