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Sketch of the TWT: (1) helix, (2) electron gun and spreader, (3) trochoidal analyzer, (4) one of four axially movable probes, and (5) magnetic coil.
Measured resonant velocity domain for a single wave at .
Measured resonant velocity domain for two waves at 30 and : (a) , (b) .
Normalized velocity distribution function for a single wave at (dashed curve), a single wave at (dot-dashed curve), and two waves at 30 and with (continuous curve). Stars and arrows give waves phase velocities; upper horizontal lines indicate trapping regions.
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