M-type BWO Backward-wave oscillator

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schematic of m-bwo


the m-type carcinotron, or m-type backward wave oscillator, uses crossed static electric field e , magnetic field b, similar magnetron, focussing electron sheet beam drifting perpendicularly e , b, along slow-wave circuit, velocity e/b. strong interaction occurs when phase velocity of 1 space harmonic of wave equal electron velocity. both ez , ey components of rf field involved in interaction (ey parallel static e field). electrons in decelerating ez electric field of slow-wave, lose potential energy have in static electric field e , reach circuit. sole electrode more negative cathode, in order avoid collecting electrons having gained energy while interacting slow-wave space harmonic.







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