To verify the concept of a coaxial gyrotron with two electron beams (CGTB), an electron gun with two beams is needed. In this paper, two types of two-beam magnetron injection guns are proposed: a normal two-beam magnetron injection gun and a coaxial two-beam magnetron injection gun. The design models and space charge limiting current are given. The simulation results show that both types of guns could fulfill the requirement for a CGTB. Comparisons between the two types of injection guns are discussed.
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Fu et al. (2009) studied this question.
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