| 摘要 |
FIELD: electronic equipment.SUBSTANCE: invention relates to electronic engineering and can be used in making electron guns with hot cathodes for microwave devices. Method for determining value of longitudinal displacement of hot cathode (Δk) caused by heating it in a microwave device includes measuring current of gun Iat zero and one or more negative with respect to cathode voltages on focusing electrode (FE) being determined from comparison Δk Iwith values of current gun andcalculated for two different longitudinal displacements of cathode Δkand Δkat same voltage value on FE, in which gun current Iwas measured according to formula:Another embodiment includes a method of measuring current Iguns at zero with respect to cathode voltage Uon focusing electrode (FE) and gun current Iwith a negative voltage Uon FE and comparing relative difference ΔI / Icurrent measured values with relative differencescalculated current values where ΔI / I= (I-I) / I, and- relative difference between values of current gun, designed for two different displacements Δkand Δk, and at same values of U, Uon FE and Δk based on a comparison is given by:EFFECT: technical result is simplification of technology determine value Δk while ensuring high accuracy of said definition that allows to produce a gun and a magnetic focusing system with small fluctuations in transit channel of beam microwave devices, and thereby prevent breakdown of microwave device.2 cl, 3 dwg |
