JPH0558211B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is based on the method in which velocity modulation given to electrons in a beam by a klystron, which is a type of vacuum electron beam tube, or a cavity resonator, is converted into density modulation. This device excites another cavity resonator, and is related to a high-power klystron device used as an amplifier in the microwave region.

[Conventional technology]

FIG. 5 is a front view of a conventional high-power klystron device, and FIG. 6 is an enlarged sectional view of the output ceramic window. In FIG. 5, 1 is an electron gun that generates an electron beam, 2 is a cavity that amplifies microwave power, 3 is an input cavity, 4 is an output cavity, and 5 is an electron beam output from the electron gun 1. 6 is an output waveguide section that guides the output microwave to the outside, 7 is an output ceramic window provided at a predetermined position of the output waveguide section 6, and 8 is an output waveguide section. This is an ion pump for maintaining the inside of 6 in a vacuum state. Next, in FIG. 6, reference numeral 9 denotes a ceramic plate that is held airtight within the output ceramic window 7 by a metal cylinder 10 that is vacuum-sealed by brazing.

Since the conventional high-power klystron device is configured as described above, the microwave power supplied to the input cavity 3 is sequentially amplified within the cavity 2 by the electron beam emitted from the electron gun 1.
Amplified microwave power is generated in the output cavity 4. Next, this microwave output is taken out to the outside through an output waveguide section 6 communicating with the output cavity 4 and an output ceramic window section 7. In addition,
The inside of the output waveguide section 6 on the load side is used in a high vacuum state, and the output ceramic window section 7 transmits the microwave output while maintaining the vacuum inside the klystron device. When microwave power passes through the window 7, electrons generated from the internal ceramic disk 9 and the brazed portion of the metal cylinder 10 are accelerated by the high electric field of this microwave power, and the ceramic disk The secondary electrons collide with the ceramic disc 9 to generate a secondary electron emission or a charge up phenomenon, so that the ceramic disc 9 is heated by the so-called multipulta effect in which the secondary electrons collide with the ceramic disc 9. Moreover,
When the klystron device is in operation, both sides of the ceramic disc 9 are in a vacuum, so the multipultor action described above occurs on both sides of the ceramic disc 9, and there is inevitably an upper limit to the transmitted power.
Peak output 30MW in pulse output, average output 15
It is limited to ~30kw.

[Problem that the invention seeks to solve]

In the conventional klystron device described above, the output ceramic window portion 7 is
This has the disadvantage that it cannot be used as a high-power klystron device because of the limitation on the transmitted power.

This invention has been made in view of this point, and provides a high-power klystron device that does not use a ceramic disk that is heated by multiparter action as in the past when the klystron device is operated. .

[Means for solving problems]

In the klystron device according to the present invention, the output waveguide section is equipped with a waveguide-shaped vacuum-resistant gate valve in place of the conventional output ceramic window section.

[Effect]

In this invention, when the klystron device is not in use, the waveguide-type vacuum-resistant gate valve installed in the output waveguide section is closed to maintain vacuum inside the tube, and when the klystron device is in use, the vacuum-resistant gate valve is closed. It is set as "open" so that the microwave output can be smoothly transmitted to the load side.

[Embodiments of the invention]

1 to 4 each show an embodiment of the present invention, but the conventional one described above (No. 5
The same reference numerals as in the figure) refer to the same constituent members.

FIG. 1 is a front view of a klystron device according to the present invention, FIG. 2 is a vertical cross-sectional view of a waveguide-type vacuum-resistant gate valve according to the present invention, and FIG.
FIG. 4, a cross-sectional view taken along the line, is an explanatory diagram of the operation of the vacuum-resistant gate valve. In FIGS. 1 to 3, reference numeral 11 denotes a waveguide-type vacuum-resistant gate valve mounted at a predetermined position of the output waveguide section 6. This vacuum-resistant gate valve 11 is constructed as follows. .

That is, in FIGS. 2 and 3, 11
A is a slide groove formed in the vacuum-resistant gate valve 11, and a valve body 12 with a rectangular through hole 17 formed at a predetermined position is slidably accommodated in this slide groove 11a. 12
A drive rod 15a is integrally attached to one side.
passes through the hollow chamber 11b of the vacuum-resistant gate valve 11 and is connected to a drive device 15 comprising, for example, a hydraulic cylinder. 16 is housed in the hollow chamber 11b, and vacuum bellows 13 are used to airtightly separate the inside and outside of the output waveguide section 6. The vacuum bellows 13 are used to keep the sliding surface between the slide groove 11a and the valve body 12 airtight. metal gasket for vacuum sealing, 15b
14 is a stopper nut screwed into the drive rod 15a, and 14 is a 1/4 wavelength choke formed inside the vacuum-resistant gate valve 11 to provide the vacuum-resistant valve 11 with power-resistant characteristics.

The klystron device of the present invention is constructed as described above, and FIG. 2 shows the valve body 12 and metal gasket 1 when the klystron device is not in use.
3 and 13, the inside of the output waveguide section 6 is cut off, and the inside of the klystron tube is kept in a vacuum, thereby showing a "closed state". Next, FIG. 4 shows that when the klystron device is used, the valve body 12 is moved via the drive rod 15a by the drive device 15, and the through hole 17 of the valve body is made to correspond to the inside of the output waveguide section 6. The microwave output generated in the output cavity 4 is transferred to the valve body 12.
It passes through the through hole 17 and is transmitted to the load side. Further, in order for the klystron device to operate stably, the ion pump 8 maintains the vacuum inside the tube at 1×10 ⁻⁷ Torr or less.

In addition, in the above-mentioned embodiment, as shown in FIG. 3, a waveguide-type vacuum-resistant gate valve using a rectangular waveguide was described, but the same effect can be achieved even if a circular waveguide is used. be able to. Furthermore, in order to improve the power durability characteristics, the quarter-wavelength chokes may be formed in multiple stages.

〔Effect of the invention〕

As described above, according to the present invention, since the output waveguide section is equipped with a waveguide-shaped vacuum gate valve, there is no limit to the transmitted power as in the conventional output waveguide using a ceramic window section. It is extremely useful as a klystron device for high power.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention, with Figure 1 being a front view of a klystron device according to the present invention, and Figure 2 being a longitudinal section showing a waveguide type vacuum-resistant gate valve. Figure 3 is the − of Figure 2.
FIG. 4, a cross-sectional view taken along the line, is an explanatory diagram of the operation of the vacuum-resistant gate valve. FIG. 5 is a front view of a conventional klystron device, and FIG. 6 is an enlarged sectional view of a conventional output ceramic window. In the figure, 1 is an electron gun, 2 is a cavity, 6 is an output waveguide, 8 is an ion pump, 11a is a slide groove, 11 is a waveguide-shaped vacuum-resistant gate valve, 1
2 is a valve body, 13 is a metal gasket, 14 is a quarter-wavelength choke, and 15 is a driving device. In addition,
The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A waveguide-shaped waveguide having a valve body that opens and closes the inside of the output waveguide section that communicates with the cavity provided between the electron gun and the collector section. A klystron device featuring a vacuum-resistant gate valve. 2. Claims characterized in that a 1/4 wavelength chiyoke is formed in communication with a slide groove of a vacuum-resistant gate valve that slidably accommodates a valve body having a through hole that opens and closes the inside of the output waveguide section. The klystron device according to item 1. 3. The klystron device according to claim 1, characterized in that a metal gasket for vacuum sealing is provided on the sliding contact surface between the valve body and the slide groove. 4. The klystron device according to claim 1, wherein the valve body is opened and closed by a drive device comprising a hydraulic cylinder or the like.