Discussion
The most important mode of operation of magnetron is one where in the phase shift between the electric fields of adjacent cavities is :
Answer: C
The most important mode is the one with a phase shift of \( \pi \) between adjacent cavities, the pi-mode.
In the pi-mode neighbouring cavities oscillate in antiphase, so the RF field at successive gaps alternates in direction. Electrons moving round the cathode in step with this pattern give up energy at every gap, forming the spokes of the space charge; this gives the highest efficiency and is the mode in which a magnetron is designed to run.
Other modes, such as \( \pi/2 \) or \( \pi/4 \) per cavity, lie close in frequency and are suppressed by strapping alternate vanes, which is done precisely to separate them from the pi-mode. \( 3\pi/2 \) is not a standard operating mode.
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