Abstract
Obtaining higher e-ciency during the development of space Traveling Wave Tubes (TWTs) is always one of the most important goals for scientists. In this paper, a scheme of obtaining the maximum theoretical overall e-ciency is explored by optimizing the helix pitch proflle of a TWT based on the collectability of spent beam. The collectability of the spent beam was evaluated by the maximum collector e-ciency, and this maximum collector e-ciency was employed to calculate the maximum theoretical overall e-ciency. The energy distribution of the spent beam and the output power of TWTs were calculated by the 3-D large signal Beam-Wave Interaction Simulator (BWIS) of MTSS. The detailed design of a Ku-band helix TWT is described according to three optimization goals (theoretical overall e-ciency, theoretical collector e-ciency and electronic e-ciency). The simulation results indicate that the optimization for high interaction circuit e-ciency or collector e-ciency by itself is not adequate to obtain maximum overall e-ciency. The maximum theoretical overall e-ciency of 77% was achieved via the optimization of slow wave structure for theoretical overall e-ciency.
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