The Cut-off Characteristics of Magnetrons ( Static Regime) †

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Abstract
Increasing the omission currents of magnetrons considerably sharpens their cut-off characteristics. Only electron, interaction, it is felt, could successfully explain this. The cut-off characteristic of a planar magnetron with a Maxwellian velocity distribution of the electrons is derived and with the help of this it is shown that inordinately high temperatures seem to prevail. This confirms results reported by others and is argued to be due to the long MFP of the electrons and their irreversible capture at the electrodes. The electron ensemble is thus far from thermal equilibrium conditions and these can only be approached at either extremely high emission currents, with the MFP being considerably less than the interelectrode distances, or by reducing the time spent by an electron in the active region by pulsing the valve. Results obtained by the latter method of measurement are encouraging though not decisive and with the help of its theory improvements of these pulse measurements are outlined.

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