JPH04332435A - Gyrotron device - Google Patents

Abstract

PURPOSE:To provide a gyrotron device wherein reflecting-mirrors and the orbit of a beam are avoided so that an exhaust route for an electron-gun section may be separated from other regions so as to exhaust the gas from each of these regions indiviadually and consequently the gas is exhausted selectively from the electron-gun section so that the gas exhausted from the electron-gun section may be absorbed or monitored even if the ghyrotron has non-axially symmetrical structure. CONSTITUTION:A partition wall 26 is formed between the region of an exhaust route 25 for an electron-gun section and other region including mirrors 5, 6, 7. And the exhaust route for the electron-gun section is led out of a vacuum vessel 24 so as to be connected to a ion-pump. The regions including the reflecting mirrors are connected to second ion-pump outside the vacuum vessel.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gyrotron device, and more particularly to improvements in its evacuation system.

0002

BACKGROUND OF THE INVENTION As is well known, a gyrotron device is an electron tube whose operating principle is cyclotron maser action, and is being used as a high-frequency, high-power source in the millimeter wave to submillimeter wave band. Such a gyrotron device, particularly a coaxial gyrotron device, consists of an electron gun that generates an electron beam, a resonant cavity that interacts with the spirally moving electron beam, and a resonant cavity that interacts with the electron beam after the interaction. A collector section that captures the beam, a high frequency output section equipped with a hermetically sealed dielectric window that extracts electromagnetic waves to the outside and maintains a vacuum inside the tube, and a magnet that gives a spiral motion to the electron beam. It is composed of etc. In such a coaxial gyrotron device, the microwave power generated in the resonant cavity during operation propagates through a circular waveguide, and, excluding a certain amount of reflection at the output section, is output from the output section to the outside. .

Recently, a gyrotron device with a built-in Vlasov converter has been proposed, which is capable of separating the paths of an electron beam and a high frequency wave using a Vlasov converter. In this type of gyrotron device, a high frequency wave whose mode has been converted by a Vlasov converter is optically transmitted using several reflecting mirrors, and is transmitted in a direction other than the electron beam, for example, in a direction perpendicular to the tube axis. It is configured to be taken out.

That is, this gyrotron device is constructed as shown in FIG. 3, and reference numeral 1 in the figure is an electron gun section that generates a hollow electron beam. Downstream of the electron beam of the electron gun section 1, there is a tapered electron beam introducing section 2 whose diameter gradually becomes smaller.
A resonant cavity 3 is continuously provided downstream of the electron beam introduction section 2. This resonant cavity 3
A Vlasov transformer 4 is provided downstream of the Vlasov transformer 4 , and downstream of this Vlasov transformer 4 a plurality of reflectors 5 , 6 , 7 are provided, corresponding to the last reflector 7 there is a high-frequency output with a hermetic window 8 . A portion 9 is provided to protrude in a direction perpendicular to the tube axis. Furthermore,
A collector section 10 is arranged downstream of the reflecting mirror 7. Further, external magnets 11 and 12 are arranged outside from the electron gun section 1 to the Vlasov converter 4 to apply a predetermined magnetic field to each section.

By the way, the gyrotron device with a built-in Vlasov converter as described above is non-axisymmetric, and the reflecting mirror 5,
6, 7 and a high-frequency output section 9 are protruded, but in the conventional axisymmetric gyrotron device, as shown in Fig. 4, the electron gun section is provided separately from the ion pump exhaust system that exhausts the collector section. An exhaust path 20 for the electron gun section is provided. This electron gun exhaust path 20 not only actively exhausts the electron gun, but also monitors gas discharge from the electron gun. In addition, the code 21 in FIG. 4 is a vacuum container, 2
2 is a mounting flange, and 23 is a waveguide.

[0006]

[Problem to be solved by the invention] In a gyrotron device with a built-in non-axisymmetric Vlasov converter, it is difficult to provide a coaxial exhaust path exclusively for the electron gun section unlike in an axisymmetric gyrotron device. .

The present invention solves the above-mentioned disadvantages, and even with a non-axisymmetric structure, it is equipped with an ion pump exhaust system similar to the conventional one, and it is possible to absorb or monitor the gas emitted from the electron gun section. The purpose is to provide a possible gyrotron device.

[0008]

[Means for Solving the Problems] In the present invention, a partition is provided between the electron gun exhaust path and a region including other reflecting mirrors, and the electron gun exhaust path is led out of the vacuum container. The region including the reflector is connected to a second ion pump outside the vacuum vessel, and is a gyrotron device.

[0009]

[Operation] According to the present invention, even if the structure is non-axisymmetric, the electron gun exhaust path and other areas are separated and exhausted separately, avoiding multiple reflecting mirrors and beam trajectories. I can do it. Therefore, the electron gun section can be selectively evacuated to absorb or monitor the gas emitted from the electron gun section.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. This invention improves the exhaust system of a gyrotron device with a built-in Vlasov converter, and only the exhaust system will be described below.

That is, the main parts of the exhaust system of the gyrotron device with a built-in Vlasov converter according to the present invention are shown in FIGS. 1 and 2.
2 is a cross-sectional view taken along line A-A in FIG. 1 and viewed in the direction of the arrow, and the same parts as in FIG. 3 are given the same reference numerals. Reference numeral 24 in the figure is a vacuum vessel, and within this vacuum vessel 24, a plurality of reflecting mirrors 5, 6, 7 are provided downstream of the Vlasov converter (not shown, see FIG. 3), and the last reflecting mirror is Corresponding to 7, a high frequency output section 9 having an airtight window 8 is provided to protrude in a direction perpendicular to the tube axis. An electron gun exhaust path 25 is provided between the reflector 5 and the vacuum vessel 24, and an electron gun exhaust path 25 is connected to the area including the other reflectors 5, 6, and 7. A partition wall 26 is provided between them. The electron gun exhaust path 25 is led out of the vacuum container 24 via an exhaust pipe 27 and connected to a first ion pump (not shown). On the other hand, the reflector 5 other than the electron gun exhaust path 25,
The region including 6 and 7 is connected to a second ion pump (not shown) via an exhaust pipe 28. The exhaust pipe 28 is provided protruding from the vacuum container 29;
A conductive mesh 30 for blocking microwaves is provided between the vacuum container 8 and the vacuum container 29 . The gyrotron device of the present invention has the same configuration as the gyrotron device shown in FIG. 3 except for the above, so detailed explanation will be omitted.

0012

[Effects of the Invention] As explained above, according to the present invention,
A partition is provided between the electron gun exhaust path and the other area including the reflecting mirror, and the electron gun exhaust path is led out of the vacuum container and connected to the first ion pump, Since the region including the ion pump is connected to the second ion pump outside the vacuum chamber, even if the structure is non-axisymmetric, it can be connected to the exhaust path for the electron gun while avoiding multiple reflectors and beam trajectories. Other areas can be separated and evacuated separately. Therefore, the electron gun section can be selectively evacuated to quickly absorb, exhaust, or monitor the gas emitted from the electron gun section.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing the main parts of a gyrotron according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1 and viewed in the direction of the arrow.

FIG. 3 is a longitudinal sectional view showing the entirety of a general Vlasov converter built-in gyrotron device.

FIG. 4 is a vertical cross-sectional view showing the main parts of a conventional gyrotron that is axially symmetrical and different from a gyrotron device with a built-in Vlasov converter.

[Explanation of symbols]

1... Electron gun section, 3... Resonant cavity section, 4... Vlasov converter,
5, 6, 7... Reflector section, 19... Output section, 24... Vacuum container, 25... Exhaust path for electron gun section, 26... Partition wall.

Claims (1)

[Claims] Claim 1: An electron gun section that generates an electron beam in a vacuum container, a resonant cavity section disposed downstream of the electron beam of the electron gun section, and a resonant cavity section disposed downstream of the resonant cavity section. An electron beam interacts with a Vlasov converter, a reflector section consisting of a plurality of reflectors provided downstream of this Vlasov converter, and a high-frequency output section provided corresponding to the last reflector. In the gyrotron device, the gyrotron device is equipped with a collector section that captures the electron beam after performing the electron gun section, and is provided with an exhaust path for the electron gun section. A partition wall is provided between the region including the reflector, and the exhaust path for the electron gun section is led out of the vacuum container and connected to the first ion pump. A gyrotron device characterized in that it is connected to a second ion pump.