Page "Traveling-wave tube" Paragraph 0
from
Wikipedia
Cutaway view of a helix TWT.
( 1 ) Electron gun ; ( 2 ) RF input ; ( 3 ) Magnets ; ( 4 ) Attenuator ; ( 5 ) Helix coil ; ( 6 ) RF output ; ( 7 ) Vacuum tube ; ( 8 ) Collector.
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1.847 seconds.