Collecting electrode used for traveling wave tube and manufacture method thereof

Abstract

The invention discloses a collecting electrode used for a traveling wave tube and a manufacture method thereof. The collecting electrode used for the traveling wave tube comprises an oxygen-free copper inner core (1), wherein a graphite loading head (2) in a conical structure is nested inside one end of the oxygen-free copper inner core (1) near an collecting electrode opening, the contact part of the oxygen-free copper inner core (1) and the graphite loading head (2) is filled with welding flux (3), in addition, the oxygen-free copper inner core (1) and the graphite loading head (2) are connected in a brazing way, and a ring (4) which is made of ultraperm and used for preventing the pull cracks of the graphite loading head (2) caused by heat expansion of the oxygen-free copper inner core (1) is sheathed on the outer ring of one end of the oxygen-free copper inner core (1) provided with the graphite loading head (2). The oxygen-free copper inner core and the graphite loading head of the collecting electrode used for the traveling wave tube with the structure are connected in the brazing way, so good heat conductive performance of the collecting electrode is ensured, in addition, the front end of the graphite loading head is processed into a conical shape, and the invention is more favorable for the electron absorption.

Description

technical field [0001] The invention relates to the field of manufacturing of traveling wave tubes, in particular to a collector equipped with a graphite loading head and a manufacturing method thereof. Background technique [0002] In a traveling wave tube, the beam of electrons emerges continuously from the slow wave after completing the interaction with the high frequency field. At this time, a special electrode is needed to collect them to ensure the normal operation of the traveling wave tube. This special electrode for collecting electrons is called the collector. The collector is bombarded by high-speed electrons during the process of collecting electrons. There are three types of electrons bombarded on the collector: one type of electrons directly enters the collector from the collector opening, disappears into the collector after reflection on the inner wall of the collector, and is exported by the collector in the form of heat; the second type of electrons flows f...

AI Technical Summary

Problems solved by technology

Among them, the second and third types of electrons have great harm to the traveling wave tube, which can cause the vibration of the tube and destroy the working performance of the tube.

With the needs of military development, the application of high-power grid-controlled traveling-wave tubes is becoming more and more widespread, but the electron pass rate of grid-controlled traveling-wave tubes is relatively poor, which increases the probability of generating second and third types of electrons, such as Instructions attached figure 1 structure shown

[0003] In order to limit the generation of the second and third types of electrons, the method of plating absorbing electron materials at the inlet of the collector is generally adopted at present, such as black chrome plating at the inlet of the collector, as shown in the attached manual. figure 2 In the structure shown, coating can make the situation better, but the traveling wave tube with this structure still has the following defects: 1. The effect of absorbing electrons is poor due to the thickness of the coating is too small; 2. The adhesion of the coating is not strong, It is easy to fall off and bring other negative effects to the tube; 3. The thermal conductivity of the coating is poor, which hinders the export of heat

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