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4. Glossary
Progressive Wave Tube (TOP); Traveling Wave Tube (TWT)
Electron tube interacting with an electron beam and a delay line. The beam is bundled by speed modulation.
TOP with helix; helix TWT
TOP where the delay line is a helix.
TOP coupled cavities TWT
TOP where the delay line is a succession of resonant cavities.
TOP à ligne à méandres ; folded waveguide TWT
TOP where the delay line is a meander line.
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This country-by-country list is as comprehensive as possible, but there are bound to be a few omissions, which the author hopes will not be held against him. The differences in size between these players are not indicated, but they can be significant.
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