JPH06231677A - High voltage current feed method for electron gun and electron gun using the method - Google Patents

Abstract

PURPOSE:To enhance withstand voltage performance as well as to simplify a structure by opening one end of a container to be filled with gas, forming the container into a cylindrical shape which has a bottom section at the other end of the container, and thereby feeding current through a lead wire penetrating an insulator which covers the opening section at the one end of the container. CONSTITUTION:An electron gun 10 includes a metallic container 14, and the container 14 is opened at its one end, and is formed into a cylindrical shape having a bottom section at the other end. In the container 14, a ground electrode 13 is disposed, and a high voltage electrode section 11 is also disposed while being parted from the electrode 13 via an insulator 12, so that the container 14 is kept at electric potential identical to that of the electrode 13. The opening section side of the container 14 is covered with a plate 15 made of insulating material, and a lead wire 16 for feeding electric power to the high voltage electrode section 11 is penetrated into the center of the plate 15. The covering of the opening section side at the one end of the container 14 with the plate 15 made of insulating material, permits a distance between the container 14 and the wire 16 to be made long, so that electric field concentration in this area can thereby be relaxed. Therefore, withstand voltage performance can be enhanced, and concurrently a structure can thereby be simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage current feeding method for an electron gun and an electron gun using the same, and more particularly to feeding an electric current to a high pressure part of the electron gun placed in a gas sealed container at atmospheric pressure. The present invention relates to a method and an electron gun using the method.

[0002]

2. Description of the Related Art An insulator is provided between a high voltage electrode portion of an electron gun and a ground electrode portion to prevent discharge, and the electrode portion is filled with a gas such as SF ₆ (sulfur hexafluoride). It is contained in a container. In such an electron gun, it is desirable to use the gas pressure at atmospheric pressure in terms of reliability against gas leakage. Also, in order to avoid extreme electric field concentration on the part where the electrode part is located, the material of the gas filled container is conventionally formed of metal, and in order to send a high voltage current to it, the lead wire for power transmission can be bushed. Need to cover.
Bushings are used to insulate the drawer when drawing a high voltage applied conductor through a ground, one example of which is shown in Slack Report SLAC-PUB-2824 (1981). ing.

FIG. 2 is a schematic view schematically showing a cross section of a conventional electron gun. In FIG. 2, the electron gun 20 includes a metal container 24, which is kept at the same potential as the ground electrode 23 inside, and the insulator 22 from the ground electrode 23.
The high-voltage electrode portion 21 is arranged via the. High voltage electrode section 21
A lead wire 26 for feeding electric power is provided in the electric wire, and the circumference of the lead wire 26 is covered with a bushing 25.

[0004]

In the electron gun 20 shown in FIG. 2 described above, since the metal container 24 is close to the high voltage lead wire 26, the space between the metal container 24 and the lead wire 26 is reduced. There is a problem in that the bushing 25 needs to be made huge in order to avoid discharge when used at atmospheric pressure because the electric field strength is increased.

Therefore, a main object of the present invention is to provide a high-voltage current feed method for an electron gun which can improve withstand voltage performance and can simplify the structure, and an electron gun using the same. Is.

[0006]

The invention according to claim 1 is
A high-voltage current feed method for an electron gun, which feeds current to a high-voltage part such as an electron gun placed in a gas-filled container at atmospheric pressure, wherein the gas-filled container has a cylindrical shape with one opening and the other bottom. That is, one opening of the gas filled container is covered with an insulating material, a lead wire is inserted into this insulating material, and an electric current is fed through the lead wire.

According to a second aspect of the present invention, in an electron gun placed in a gas sealed container at atmospheric pressure, an insulator covering one opening of the gas sealed container and the insulator inserted into this insulator to feed current. And a lead wire for.

[0008]

A high-voltage current feed method for an electron gun and an electron gun using the same according to the present invention are formed in a cylindrical shape having an opening on one side and a bottom on the other side. The opening is covered with an insulating material, a lead wire is inserted through the insulating material, and a current is fed through the lead wire, whereby the withstand voltage performance is improved and the structure is simplified.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view schematically showing an embodiment of the present invention. Referring to FIG. 1, the electron gun 10 is a metal container 1
4, the metal container 14 is formed in a cylindrical shape having an opening on one side and a bottom portion on the other side. In the metal container 14, the ground electrode 13 and the high-voltage electrode portion 11 are arranged from the ground electrode 13 via the insulator 12, and the metal container 14 is kept at the same potential as the ground electrode 13. On the opening side of the metal container 14,
This insulator 1 is covered by a plate 15 formed of an insulator.
A lead wire 16 for sending electric power to the high-voltage electrode portion 11 is inserted through the center of 5.

As described above, by covering one opening side of the metal container 14 with the plate 15 made of an insulating material, the distance between the metal container 14 and the lead wire 16 can be lengthened, and the electric field concentration at this portion is relaxed. This can prevent the bushing from becoming huge and simplify the structure.

[0011]

As described above, according to the present invention, one opening of the gas sealing container is covered with an insulating material, a lead wire is inserted into the insulating material, and a current is fed through the lead wire. Therefore, the distance between the lead wire and the gas filled container can be increased, and the electric field concentration at this portion can be relaxed. As a result, the withstand voltage performance can be improved and the structure can be simplified, which is effective for an electron gun system using a high voltage.

[Brief description of drawings]

FIG. 1 is a schematic view schematically showing an embodiment of the present invention.

FIG. 2 is a schematic view schematically showing a conventional electron gun.

[Explanation of Codes] 10 Electron Gun 11 High Voltage Electrode 12 Insulator 13 Grounding Electrode 14 Metal Container 15 Plate 16 Lead Wire

Claims (2)

[Claims] 1. A high-voltage current feeding method for an electron gun, which supplies a current to a high-voltage part such as an electron gun placed in an atmospheric pressure gas-filled container, wherein one of the gas-filled containers is opened, It is a cylindrical shape having a bottom portion on the other side, one opening of the gas sealing container is covered with an insulator, a lead wire is inserted into the insulator, and an electric current is fed through the lead wire. ,
High voltage current feed method for electron gun. 2. An electron gun placed in a gas enclosure at atmospheric pressure, wherein the gas enclosure has a cylindrical shape having one opening and a bottom portion on the other side, and one opening of the gas enclosure is opened. An electron gun, comprising: a covering insulator; and a lead wire that is inserted into the insulating member to feed an electric current.