JPH0424593Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a traveling wave tube device, and more particularly to an improvement of a traveling wave tube device including a periodic magnetic field device for focusing an electron beam in a slow wave circuit.

[Technical background of the invention and its problems]

A traveling wave tube device with a helical slow-wave circuit or a cavity-coupled slow-wave circuit consists of an electron gun structure, a slow-wave circuit structure following it, a periodic magnetic field device arranged around its outer periphery, and a beam downstream. It is comprised of a collector electrode structure, a base plate that mechanically holds these and also serves as a heat sink, which is installed to receive heat dissipation from the slow wave circuit structure and the periodic magnetic field device, and the entire case.

The base plate must be mounted in such a way as to provide heat dissipation as described above, as well as to hold the entire slow wave circuit structure stable so that the electron beam path of the slow wave circuit does not bend during operation of the tube.
For example, in traveling wave tube devices mounted on satellites, the operating frequency band is extremely high, over 10 GHz, so the beam path diameter of the slow wave circuit structure is narrow, less than 1 mm, and this is due to fluctuations in operating conditions. The electron beam passing through the slow wave circuit, which must be maintained in a straight line regardless of the The beam diameter may change and the amount of beam captured by a portion of the slow wave circuit may vary. Particularly near the output section of the slow-wave circuit structure, in addition to these factors, there is also large high-frequency loss in the helix portion, and furthermore, the temperature tends to rise due to conduction heat from the collector electrode structure. On the other hand, if the heat transfer body is disposed throughout the slow wave circuit structure so as to increase the thermal conductivity from the slow wave circuit structure to the base plate, the weight of the traveling wave tube device will increase undesirably, which is not preferable especially for use on a satellite.

[Purpose of invention]

This idea was made in view of the above circumstances, and it allows the slow-wave circuit structure and the periodic magnetic field device to be mechanically stably held on the base plate without increasing the weight of the entire device, and it also enables The present invention provides a traveling wave tube device that can achieve temperature leveling.

[Summary of the idea]

This idea consists of a periodic magnetic field device in which a ferromagnetic shim ring is interposed between adjacent permanent magnets, and a heat transfer plate is interposed between each shim ring and a base plate that also serves as a heat sink. The traveling wave tube device is a traveling wave tube device in which the output section side region is installed at higher density than the intermediate section of the slow wave circuit structure and the upstream region thereof.

[Example of idea]

Examples thereof will be described below with reference to the drawings. Note that the same parts are represented by the same symbols.

Figures 1 and 2 show this invention applied to a traveling wave tube device having a helical slow wave circuit. The symbols in the figure represent the following components.
That is, 11 is an electron gun structure, 12 is a slow wave circuit structure, 13 is a periodic magnetic field device, 14 is a collector electrode structure, 15 is a base plate, and 16 is a case.

The constituent elements of the electron gun assembly 11 are: 17 an impregnated cathode with a concave electron emitting surface; 18 a Wehnelt electrode; 19 an accelerating anode; 20 an anode support tube;
1 represents a ceramic insulating cylinder, and 22 represents a joining metal ring.

The components of the slow-wave circuit structure 12 include a helix 23, three dielectric helix support rods 24, an attenuator 25 attached to the helix support rod in the middle of the slow-wave circuit, and an elongated pipe-shaped 26. Vacuum container, 27 is an input coaxial line, 28 is an input connector terminal, 29 is an electron beam introduction electrode plate of a slow wave circuit, 30 is a pole piece, 31 is a collector connection end plate, 32 is a collector side container cylinder, 33 is an output coaxial The line 34 represents an output waveguide.

The constituent elements of the collector electrode assembly 14 include a collector support plate 35, a high heat resistance bellows 36, a holding cylinder 37, a heat shield 38, a funnel-shaped collector electrode 39, and a collector vacuum vessel 40.

The components of the periodic magnetic field device 13 include a large number of ring-shaped permanent magnets 41, and ferromagnetic shim rings 42 interposed between the permanent magnets, each of which has a small cylindrical inner peripheral surface connected to the outer periphery of the vacuum vessel. 43 is a ring-shaped spacer with good thermal conductivity, and 44 is a magnet fixing band.

The base plate 15 is made of a lightweight metal with good thermal conductivity, such as aluminum, and has a thinner end 45 on the electron gun assembly side, and is separated from the electron gun assembly by a space S. Further, a collector support plate 35 is fixed to the bent portion 46 at the end of the collector electrode structure. Heat transfer plates 47, 47, . . . made of copper plates are interposed and joined between the base plate 15 and each shim ring 42 by soldering.

Now, in the middle part of the slow-wave circuit structure 12 and its upstream region A1, the heat exchanger plates 47 are joined to every other shim ring 42, and the intervals between the heat exchanger plates 47 are sparse. In addition, the base plate 15 in this area is
The back side is cut out to form a recess 48, and the front side is cut out between each heat exchanger plate to form a recess 49, so that the cross-sectional area perpendicular to the tube axis is substantially reduced. On the other hand, the output side of the slow wave circuit is approximately 3
In the 1/2 area A2, heat transfer plates are joined to all the shim rings 42 and fixed to the base plate at high-density intervals. Further, the base plate in this region remains thick and has a larger cross-sectional area perpendicular to the tube axis than in the region A1. On the other hand, in the input area A3 on the upstream end side of the beam of the slow wave circuit structure, heat transfer plates 47 are joined to two or three consecutive shim rings 42 on the upstream end side and attached at high density installation intervals. The slow wave circuit structure and the electron gun structure 11 are mechanically stably held on the base plate.

In this way, the slow wave circuit structure, the periodic magnetic field device, and the electron gun structure are mechanically and stably supported by the heat exchanger plate with respect to the base plate. In the output part side area A2 where the temperature is relatively likely to rise,
Since the heat transfer plates are arranged at high density intervals, heat is effectively radiated to the base plate. On the other hand, in the middle region A1 where the temperature does not rise relatively,
Since the heat exchanger plates are arranged at sparse intervals and the cross-sectional area of the base plate is small, heat dissipation is sufficient and the weight per unit length is small. In addition, a heat exchanger plate is continuously installed in the electron gun side end region A3, and effective heat dissipation can be obtained in this region where the electron beam diameter tends to vary locally depending on whether or not a high-period signal is input. Moreover, the electron gun assembly can be supported by the base plate using these heat transfer plates. Therefore, overall weight reduction is achieved, and
Even and sufficient heat dissipation from the slow wave circuit to the base plate is obtained, and a mechanically stable support structure is obtained. In addition, heat conduction from the collector electrode assembly and slow wave circuit power section regions, where temperatures tend to rise, to the electron gun assembly via the base plate is also suppressed, thereby suppressing one factor that causes fluctuations in the cathode temperature. can.

[Effect of idea]

As explained above, according to this invention, in the periodic magnetic field device, ferromagnetic shim rings are interposed between adjacent permanent magnets, and a heat exchanger plate is interposed between each shim ring and a base plate that also serves as a heat sink. , since the heat exchanger plates are installed at a higher density in the intermediate part of the slow-wave circuit structure and in the output region than in the upstream region,
The overall weight is reduced, heat dissipation from the slow wave circuit to the base plate is evenly and sufficiently achieved, and a mechanically stable support structure is obtained throughout.

In addition, by configuring the cross-sectional area of the base plate in the intermediate region of the slow-wave circuit structure to be smaller than the cross-sectional area of the output region, it is possible to further reduce the weight, and
It is also possible to suppress heat conduction from the collector electrode assembly and the slow wave circuit output section side region, where the temperature tends to increase, to the electron gun assembly side via the base plate.

Furthermore, by installing heat transfer plates in a high density area near the electron gun structure, heat dissipation from the slow wave circuit in this area is increased, and the electron gun structure is mechanically stabilized by these heat transfer plates on the base plate. can be supported. Therefore, it is not necessary to directly thermally connect the base plate and the electron gun structure, and in particular, it is possible to prevent the influence of temperature fluctuations of the base plate on the cathode temperature. In this way, a traveling wave tube device that is highly reliable both mechanically and in terms of operating characteristics is obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view of the main part showing an embodiment of this invention, and FIG. 2 is an enlarged sectional view of the main part. 11 ...electron gun structure, 12 ...slow wave circuit structure,
13... Periodic magnetic field device, 14 ... Collector electrode structure, 15 ... Base plate, 23... Helix, 26... Vacuum vessel, 41... Ring-shaped permanent magnet, 42, 42... Shim ring, 47, 47...
Heat transfer plate, A1... slow wave circuit intermediate area, A2... slow wave circuit output area, A3... slow wave circuit input area,
48, 49...Base plate recess.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An electron gun structure, a slow wave circuit structure connected downstream of the beam and having a high frequency input section and an output section near both ends, and the outer periphery of this slow wave circuit structure. In a traveling wave tube device comprising: a periodic magnetic field device installed in a space; a collector electrode structure following the collector electrode structure; and a base plate that thermally and mechanically supports the slow wave circuit structure and the periodic magnetic field device, In the periodic magnetic field device of the slow wave circuit structure, a ferromagnetic shim ring is interposed between adjacent permanent magnets, a heat transfer plate is interposed between each shim ring and the base plate, and the heat transfer plate is 1. A traveling wave tube device characterized in that the output part side region is installed at higher density than the intermediate part of the slow wave circuit structure and the upstream region thereof. (2) The traveling wave according to claim 1 of the utility model registration is such that the heat exchanger plates are installed at a higher density near the side end of the electron gun structure than in the intermediate region of the slow wave circuit structure. tube device. (3) Utility model registration request for a base plate in which the cross-sectional area perpendicular to the tube axis of the portion corresponding to the intermediate region of the slow-wave circuit structure is smaller than the cross-sectional area of the portion corresponding to the vicinity of the output section. range 1
Traveling wave tube device as described in .