JP3079559B2 - Traveling wave tube collector - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling wave tube collector, and more particularly, to a traveling wave tube collector provided with a mechanism for exhausting gas generated inside the collector.

[Conventional technology]

As shown in FIG. 2, a conventional traveling-wave tube collector is:
Exhaust means such as an exhaust pipe 4 is provided in a part of the vacuum envelope, and gas generated inside the collector is supplied to the first collector electrode 6.
The exhaust gas is exhausted through the electron beam passage hole 3 at the tip.

[Problems to be solved by the invention]

In the conventional traveling-wave tube collector described above, all gases generated inside the collector cannot be exhausted unless they pass through an electron beam passage hole at the tip of the collector electrode, and a traveling-wave tube or a collector that requires a large current is required. In a millimeter-wave traveling-wave tube in which the diameter of the electron beam passage hole at the tip of the electrode becomes smaller, the ratio of the diameter of the electron beam to the diameter of the electron beam passage hole at the tip of the collector electrode becomes extremely large, and the electron beam is generated inside the collector electrode. It becomes difficult for the gas to reach the exhaust pipe, and there is a problem that the gas is accumulated inside the collector electrode and the degree of vacuum is deteriorated.

Deterioration of the degree of vacuum causes instability of operation and deterioration of characteristics of the traveling wave tube, and also has a drawback that aging time increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a traveling wave tube collector in which no gas is accumulated inside the collector electrode, the operation is not unstable, and the characteristics are not deteriorated.

[Means for solving the problem]

The present invention provides a collector electrode for capturing an electron beam emitted from an electron gun and passing through a slow-wave circuit that performs high-frequency amplification via an insulating stone that electrically insulates between the slow-wave circuit and the collector electrode. In a traveling wave tube collector provided with an appropriate exhaust means, when the hole diameter of the electron beam passage hole at the tip of the collector electrode is φdo and the radius of the inner wall of the collector is Ro, (1/2) φdo < φd <φd
at least one hole with a diameter φd that satisfies o
(1/2) It is installed at a position of R satisfying Ro, and a shield is provided near the base of the collector electrode to prevent an electron beam from colliding with the insulating stone.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

 FIG. 1 is a sectional view of one embodiment of the present invention.

 Here, a two-stage collector will be described.

As shown in FIG. 1, a hole 8 having a diameter of φd is formed at the tip of the first collector electrode 6 separately from the electron beam passage hole 3 of φdo in consideration of the leakage current and the trajectory of the retrograde electrons. It is open at a certain position. Further, the diameter φd of the hole 8 is set to be smaller than the diameter φdo of the electron beam passage hole in consideration of the purpose of reducing the exhaust resistance and the orbit of the retrograde electron. In this case, if one or more holes 8 are opened, the exhaust resistance of the holes 8 is smaller than the exhaust resistance of the electron beam passage holes 3, and the gas generated inside the collector electrode is In addition, the gas can reach the exhaust pipe through the hole 8 without passing through the electron beam passage hole 3, and the gas can be prevented from accumulating inside the collector.

The shield 9 is made of an insulating stone 5 formed by an unstable electron beam.
It is attached to prevent the pressure resistance of the inner surface from deteriorating.

〔The invention's effect〕

As described above, according to the present invention, the gas generated inside the collector electrode can reach the exhaust pipe without passing through the electron beam passage hole by forming a hole other than the electron beam passage hole in the first collector electrode. Gas can be prevented from accumulating inside the collector electrode. Thereby, there is an effect that the operation of the traveling wave tube is stabilized and sufficient characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of an example of a conventional traveling wave tube collector. DESCRIPTION OF SYMBOLS 1 ... Electron beam, 2 ... Enclosed plate, 3 ... Electron beam passage hole, 4 ... Exhaust pipe, 5 ... Insulation stone, 6 ... First collector electrode, 7 ... Second collector electrode, 8 ... ... Hole, 9 ... Shield.

Claims (1)

(57) [Claims] 1. A collector electrode for catching an electron beam emitted from an electron gun and passing through a slow-wave circuit for performing high-frequency amplification is provided via an insulating stone that electrically insulates between the slow-wave circuit and the collector electrode. In a traveling wave tube collector provided with an appropriate exhaust means, when the hole diameter of the electron beam passage hole at the tip of the collector electrode is φdo and the radius of the collector inner wall is Ro, (1/2) φdo is applied to the collector electrode. <Φd <φd
At least one hole having a diameter φd that satisfies o is installed at a position of R that satisfies R> (1/2) Ro from the central axis, and the electron beam collides with the insulating stone near the base of the collector electrode. A collector for a traveling-wave tube, which is provided with a shield for preventing a wave.