The effect of an applied static electric field on beam electrons trapped by the wave in a traveling wave tube has been investigated experimentally. For sufficiently weak applied fields the wave power is enhanced. When the applied field is sufficiently strong the beam electrons are detrapped, and the wave power enhancement is destroyed. It is found that the beam space charge plays an important role in the detrapping process and acts to limit the wave power enhancement. In addition it is found that the wave power enhancement can be increased by increasing the rf input drive level. By launching waves near the saturation level, over 10 dB of wave power enhancement has been observed. These effects are predicted in a computer simulation, and there is good agreement between the results of the simulation and the experimental results.
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Tsunoda et al. (1984) studied this question.
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