A FAST COMPUTATION OF THE START-OSCILLATION CURRENT OF BACKWARD WAVE IN MMW HTWT's

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Abstract

Backward wave oscillation can be troublesome in high power helix TWT, especially millimeter wave helix traveling wave tubes (MMW HTWT's). To suppress these oscillations, start-oscillation current of backward wave has to know when MMW HTWT's are designed.

A fast computation of the start-oscillation current for MMW HTWT's is presented. It is shown that the computed values are agreed with the experimental results in Ka band.

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