Abstract: A coaxial drift tube allows propagation of an ultrahigh-power relativistic electron beam (500 keV, $GREQ@100 kA, 100 ns). In this paper we study the modulation of a large diameter (12.6 cm) intense relativistic electron beam (500 keV, 16 kA) by an external microwave source via particle simulation. The annular beam, enclosed within a coaxial drift tube, is found to be fully modulated by a low-power external rf source at a frequency of 1.3 GHz. We further show that the coaxial configuration is easily scaled to high power. Here, a very large diameter (26 cm) intense beam (460 keV, 100 kA) is fully modulated at 1.3 GHz to obtain 31 GW of rf beam power.!
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