
210 MICROWAVE TUBES
Figure 1 1-5 Magnetron anodes: A) hole-and-slot block; B) regular trapezoidal block; C) rising
sun block; D) arrangement of magnetic fields relative to resonators.
11-3.2 Pi (~) Mode Operation
When an electron cloud sweeps past a resonator, its shock excites the resonator
into self-oscillation. This effect is the same as an impulse shock exciting an
LC
tank
circuit. The oscillations combine to set up an electric wave in the interaction space
between cathode and anode. Because the wave adds algebraically with the static dc
potential, it causes both acceleration and deceleration of the electron cloud. This ...