| 摘要 |
A traveling wave tube amplifier having an axial annular electron stream and a pair of counterwound axially aligned and radially spaced helices positioned intermediate the electron beam source and the collector electrode. The innermost helix is wound on the outer surface of a cylindrical ferrite which in turn is biased by means of a current-carrying wire loop passing through the axial bore of the ferrite cylinder. The RF input to the amplifier is at the electron source end and is applied to both counterwound coils, either in-phase or 180 DEG out-of-phase. The annular electron stream passes through the annular spacing between both helices and interacts with a prescribed mode, preferably the fundamental mode of RF wave energy propagated axially along the ferrite cylinder.
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