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Triple-beam monotron

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2 Author(s)
Barroso, J.J. ; Associated Plasma Lab., Nat. Inst. for Space Res., Sao Jose de Campos, Brazil ; Kostov, K.G.

Without requiring an externally applied magnetic field, the triple-beam TM040, 6.7-GHz monotron devised in this paper includes a simple structure where the elementary functions of electron bunching and energy transfer to the RF field are performed in a single circular cylindrical cavity, which makes such a microwave generator a compact lightweight device. The cavity geometry (radius 8.42 cm, length 1.0 cm) and injection beam energy (10 keV) are determined on the basis of a one-dimensional (1-D) Lagrangian treatment neglecting space-charge forces. A 2 1/2-D particle-in-cell simulation is carried out for 0.4-cm-thick beams at currents in proportion to the beams' cross section. This gives 560-kW output power at an overall tube efficiency of 14.8% in close agreement with 1-D theory.

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Plasma Science, IEEE Transactions on  (Volume:30 ,  Issue: 3 )