JPH065214A - Slow-wave circuit body structure for traveling-wave tube - Google Patents

Abstract

PURPOSE:To improve a heat dissipation characteristic and reduce characteristic deterioration of a traveling-wave tube. CONSTITUTION:In the slow-wave circuit body structure of this traveling-wave tube, plural cavities 1 are connected, pole pieces 4 adopted as vacuum vessels and spacers 5 are engaged on the outer side of these cavities, and attenuation elements 7a and 7b are provided in some cavities 1a and 1b of the plural cavities. The attenuation elements are airtightly connected to a ferrule 8 in which the cavities are formed so as to be adopted as a part of the vacuum vessels.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slow wave circuit structure of a traveling wave tube, and more particularly to improvement in the vicinity of an attenuation element thereof.

[0002]

2. Description of the Related Art Generally, a cavity-coupled traveling-wave tube includes an electron gun section for emitting an electron beam, a slow-wave circuit structure for interacting the electron beam with an electromagnetic wave, and an electron beam after the interaction. -Collectors for capturing the frames are sequentially connected. The slow wave circuit structure is conventionally configured as shown in FIG.
A plurality of cavities 1 are coupled by a coupling hole 3 of a ferrule 2, and a pole piece 4 and a spacer 5 serving as a vacuum container are fitted on the outside of these cavities 1. Further, damping elements 6a, 6b mainly made of SiC are provided in some of the cavities 1a, 1b. The attenuating elements 6a and 6b are provided to prevent the return of electromagnetic waves from the output side and to prevent oscillation.

[0003]

The attenuation elements 6a, 6b in the conventional cavity-coupled traveling wave tube as described above are sandwiched and fixed by the cavities 1a, 1b on both sides. However, in this structure, when vibration is applied to the traveling wave tube, the positions of the damping elements 6a and 6b may fluctuate and the characteristics may become unstable. Further, even when the temperature in the vicinity of the damping elements 6a and 6b rises, the characteristics of the damping elements 6a and 6b themselves may change due to heat, and the characteristics of the traveling wave tube may become unstable.
The present invention has been made in view of the above points, and an object of the present invention is to provide a slow-wave circuit structure of a traveling-wave tube that has excellent heat dissipation characteristics and has little deterioration of the characteristics of the traveling-wave tube.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a plurality of cavities are coupled to each other, and a pole piece and a spacer serving as a vacuum container are fitted on the outer sides of the cavities, thereby forming a plurality of cavities. A slow wave of a traveling wave tube in which a damping element is provided in a part of the cavity, and the damping element is hermetically bonded to a ferrule forming the cavity so as to be a part of a vacuum container. There is a circuit structure.

[0005]

According to the present invention, the characteristics are stable without changing the position of the damping element. Also, since the damping element is exposed, heat dissipation is extremely good. Therefore, the thermal and mechanical characteristic deterioration of the traveling wave tube can be prevented, and the characteristics as the traveling wave tube can be stabilized.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

The slow-wave circuit structure of the cavity-coupled traveling-wave tube according to the present invention is constructed as shown in FIG. 1, and the same parts as those in the conventional example (FIG. 2) are designated by the same reference numerals. That is, the plurality of cavities 1 are coupled by arranging the plurality of ferrules 2 having the coupling holes 3 at predetermined intervals in the axial direction. On the outside of these cavities 1, a pole piece 4 made of a magnetic material and a spacer 5 made of a non-magnetic material are fitted every other one, and these double as a vacuum container. Furthermore, damping elements 7a and 7b are provided in some of the cavities 1a and 1b of the plurality of cavities 1. The damping elements 7a and 7b are airtightly joined to the adjacent ferrules 2 by brazing. There is. Reference numeral A in the drawing is a brazing portion. In this case, as is apparent from the figure, the damping elements 7a and 7b are configured so as to be a part of the vacuum container, and the spacer 5 does not exist in that portion, and the damping elements 7a and 7b
7b and the ferrule 8 are exposed. A magnet (not shown) is arranged between the respective pole pieces 4. or,
The present invention can be applied to a structure in which the ferrule also serves as a pole piece of the periodic magnetic field device.

[0008]

According to the present invention, since the damping element is brazed to the adjacent ferrules of the cavity, the characteristic is stable without changing its position. Further, since the peripheral portion of the damping element is exposed as a part of the vacuum container, heat dissipation becomes extremely good. As a result, the thermal and mechanical characteristic deterioration of the traveling wave tube is prevented, and the characteristics of the traveling wave tube can be stabilized.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a slow wave circuit structure of a traveling wave tube according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a conventional slow wave circuit structure of a traveling wave tube.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cavity, 2 ... Fell, 3 ... Coupling hole, 4 ... Pol pace, 5 ... Spacer, 7a, 7b ... Damping element, 8 ... Fell, A ... Brazing part.

Claims (1)

[Claims] 1. A plurality of cavities are coupled to each other, and a pole piece and a spacer serving as a vacuum container are fitted to the outside of the cavities, and a part of the plurality of cavities is inside the cavity. A slow-wave circuit structure of a traveling-wave tube in which a damping element is provided in the vacuum vessel, wherein the damping element is airtightly joined to the ferrule forming the cavity so as to be a part of the vacuum container. Slow wave circuit structure of traveling wave tube.