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A 220 GHz traveling wave tube (TWT) is being developed in our lab. This TWT is based on a folded waveguide circuit with an electron beam focused by periodic permanent magnets (PPMs). To measure the transmission loss of the TWT directly, a prototype without a sever has been built. The maximum output power of this prototype is 1.1 W at 225 GHz. The gain, output power and transmission loss are close...
This paper introduces the design method and experiment of intensive beam electron optics which contains an electron gun and a magnetic focusing system for a 220GHz folded waveguide TWT. Pierce type electron gun is used. The thermal initial velocity effects as well as the beam waist radius and gunshot distance are considered for the design of electron gun. The period permanent magnet (PPM) system which...
A compact folded waveguide traveling-wave tube (TWT) with PPM system operating at 220 GHz with 10 W of output power and 10 GHz bandwidth is being developed. This paper reports the test results of the latest prototype.
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