Abstract
Slow wave structures used in forward wave amplifiers like wide-band helix traveling wave tube (TWT) always support backward waves. A backward wave can interact with an electron beam and compete with the forward wave, and then the power holes occur under large signal conditions. The power holes have serious consequences for the TWT performances, especially for communication applications. In this paper, we have reported the research on backward wave oscillation (BWO) power holes using a 2D large signal helix TWT code and demonstrated an efficient method, the helix pitch taper method, to suppress the power holes.
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