Exit window of the accelerator of charged particles

 

(57) Abstract:

The invention relates to accelerator technology and can be used to output a beam of charged particles in the atmosphere or irradiated environment. Exit window of the accelerator of charged particles contains a cooled support grid and the first metal foil, vacuum-tightly mounted on the vacuum chamber and an additional metal foil, vacuum-tightly mounted on an additional cooling control grid of vacuum-tightly mounted on the first foil on the other from the vacuum chamber side, and in the space between the metal foil supported on a pressure below atmospheric, but higher than in the vacuum chamber. This pressure is controlled by measuring the signal unit which generates an alarm when the pressure in the gap between the foils. To improve the service life of the metal foils in the space between them, you can use an inert gas. The technical result of the invention is to increase the reliability of the exit window of the accelerator and accident prevention. 1 C.p. f-crystals, 1 Il.

The invention relates to accelerator technology and can be used to output a beam of charged particles in the I and accident prevention.

Currently, the accelerators of charged particles, especially electrons, are widely used in radiation technologies. This raises the necessity of the conclusion of the electron beam in the atmosphere or other irradiated environment (e.g., liquid).

Usually used for this purpose the output window containing a cooled support grid and a metal foil, vacuum-tightly mounted on the vacuum chamber. It is known a device in which the outlet box contains two foil, the space between which is connected with a system of pumping gas [1]. The closest technical solution is the device [2], which contains a cooled support grid and a metal foil, vacuum-tightly mounted on the vacuum chamber, and also has an additional metal foil, vacuum-tightly mounted on the first foil. This second foil on the outer side has a system of evenly along the length of the open distributed curved rods of circular cross section, which sets the speed of the airflow, and therefore is governed by the heat transfer and the temperature of the foil.

However, such devices do not exclude breakthrough foil for various reasons, Such a breakthrough leads to plucene aggressive environments this can cause damage not only pumps, but all of the vacuum chamber, i.e. to the accident.

The invention is illustrated in the drawing.

The invention consists in that the exit window of the accelerator of charged particles contains a cooled support grid 1 and the first metal foil 2, the vacuum-tightly mounted on the vacuum chamber 3, and an additional metal foil 5, the vacuum-tightly mounted on an additional cooling of the supporting bars 4, vacuum-tightly mounted on the first foil 2 on the other side of the vacuum chamber side, and in the space between the metal foil supported on a pressure below atmospheric, but higher than in the vacuum chamber. This pressure is controlled by measuring the signal unit which generates an alarm when the pressure in the gap between the foils.

The device operates as follows. After Assembly of the foil between space pumped the air to a pressure equal to (for example) half of the atmospheric (or irradiated environment), and from the vacuum chamber to a desired vacuum. The control and measuring unit can be performed, for example, with contact manovacuummeter ACMV-1y in the form of sensor. Contact electrodes manovacuummeter vystavel is in mitofanova space increases, and at the break back - drops. In both cases, the arrow manovacuummeter touches one of the contacts, and measuring a signal block outputs a signal or command about the accident.

The total thickness of the two foils (and weakening of the electrons in them) remains virtually unchanged, since the pressure (atmospheric or irradiated environment) is evenly distributed between the foils. Therefore, the foil must be able to withstand the full pressure only briefly, at the time of the accident.

To improve the service life of the metal foils in the space between them, you can use an inert gas to prevent oxidation, as oxygen and ozone and nitrogen oxides generated during irradiation.

Literature

1. Semenov, O. C. and other Outlet ports of high-current electron accelerators. Report of the II all-Union conference on application of accelerators in the national economy, so 2., Leningrad, 1976, S. 116-122.

2. A. S. USSR N 643049, class H 05 H 7/00.

1. Exit window of the accelerator of charged particles, containing a cooled support grid and the first metal foil, vacuum-tightly mounted on the vacuum chamber and an additional metal foil, vacuum-tight at the of Italia contains further cooled support grid, installed on the first foil on the other from the vacuum chamber side, and in the space between the metal foil supported on a pressure below atmospheric, but higher than in a vacuum chamber, which is controlled measuring-signal block.

2. The device under item 1, characterized in that to increase the service life of metallic foils in the space between them is used inert gas.

 

Same patents:

FIELD: physics.

SUBSTANCE: proposed method of obtaining an electron beam involves applying supply voltage between a cathode with a cavity and an anode. A high-voltage discharge is initiated in a gas-discharge cell. A plasma forms in the cavity of the cathode, which provides for emission of electrons, accelerated by the strong field of the high-voltage discharge. The formed plasma has low density, for which purpose the surface of the cathode cavity is made from a dielectric. The generated electron beam can also be used as an auxiliary electron beam, which is directed over the surface of the open part of the cathode with a cavity. At the open part of the cathode on the side of the anode, a high-current electron beam is then formed. The device for generating an electron beam comprises an anode and a hollow cathode with an opening on the walls, which is located near the anode, all put into a gas-discharge cell. The wall of the hollow cathode with an opening is made from a dielectric sheet with an opening. The high-voltage power supply is connected to the anode and cathode.

EFFECT: provision for operation of sources under high pressure.

3 cl, 7 dwg

FIELD: physics.

SUBSTANCE: invention relates to electronic engineering. An exit window unit of an electron beam (10) generating device comprises a supporting plate (22) and an electron exit window foil (20). The supporting plate (22) is configured to reduce creases in said foil (20). The foil (20) is fastened to the supporting plate (22) along a closed fastening line (26), which bounds a region in which the supporting plate (22) has a structure of openings and supporting parts for the foil, arranged in an alternating manner. When a vacuum is created in the housing (14), said structure is configured to form a topographic profile of the foil (20) which substantially absorbs any excess foil.

EFFECT: invention relates to a method of reducing creases in foil.

9 cl, 13 dwg

FIELD: electronics.

SUBSTANCE: invention is related to electronic engineering. Mounting assembly consists of support plate (22) and exit window foil (20) for use in an electron beam device, said support plate (22) being designed to reduce wrinkles in said foil (20), which wrinkles may arise due to surplus foil arising in assembly process. Foil (20) is bonded to support plate (22) along closed bonding line (26) bounding substantially circular area in which support plate (22) is provided with apertures and foil support portions and in which area foil is adapted to serve as a portion of a wall of a vacuum tight housing of electron beam device. Invention also relates to a method of reducing wrinkles.

EFFECT: technical result is increased efficiency of resolution of passage of electrons and longer service life of foil.

10 cl, 7 dwg

Up!