Device for irradiating an object with a beam of charged particles

 

(57) Abstract:

The invention relates to the field of electrical engineering, namely to electromagnetic devices scan beam used for irradiation of various objects. A device for scanning and analysis of the beam is made in the form of an electromagnet scan beam. The current sensor is analyzed beam is made in the form of the collector of the inverter. The generator excitation current has two outputs and two inputs. The first input of the generator is connected to the output of the programmer electromagnet scanner, and the second input - output device analysis. The first output of the generator is connected to the input of the electromagnet scanner, and the second output to the first input of the Registrar of the spectrum. The second input of the Registrar of the spectrum is connected to the output of the sensor is analyzed beam. The sensor is installed in the plane sweep for the final window of the vacuum chamber away from the Central axis of the electromagnet scanner. 2 Il.

The invention relates to the field of electrical engineering, namely to electromagnetic devices scan beam used for irradiation of various objects with a beam of charged particles.

The known device for allocryptopine and movement of irradiated object with a conveyor in the other direction, perpendicular to the sweep direction. Such devices are used, in particular, radiation technologies and installations for sterilizing objects by an electron beam.

Closest to the present invention is a device for irradiating objects with a beam of charged particles, which contains a vacuum chamber having the outlet box for the beam, an electromagnet scanner, generator excitation current of the electromagnet and the programmer sweep associated with this generator. (KN. Abrahamian, E. A. Industrial electron accelerators. - M.: Energoatomizdat, 1986, S. 88, Fig. 6.15).

A disadvantage of this device is the lack of tools for analyzing the energy spectrum of the beam, which is often one of the most important requirements of radiation technology. In particular, the State standard of the Russian Federation GOST R 50325-92 entered 01.01.94 right requires in his article 2.5.3 during radiation sterilization of medical products by an electron beam to measure the energy periodically using magnetic analysis". This analysis of the spectrum of the beam is usually carried out in the intervals between the cycles of irradiation, which uses a magnetic spectrometer with his sidestone increase the size of the installation, growing energy consumption, deteriorating its technical characteristics, especially in installations with local radiation protection.

In the proposed device, these drawbacks are absent, as in the quality of the analyzing electromagnet is used an existing an electromagnet scanner. For this purpose a device for irradiating an object with a beam of charged particles, consisting of a vacuum chamber with an outlet box, of an electromagnet sweep generator excitation current of the electromagnet and the programmer sweep entered programmer analysis, the Registrar of the spectrum with two inputs and the current sensor are analyzed beam, made in the form of collector inverter and mounted over the outlet window of the vacuum chamber; in addition, the generator excitation current of the electromagnet is made with two inputs and two outputs, the first input of the generator is connected to the output of the programmer sweep, and the second generator input coupled to the output of the programmer analysis, the first generator output is connected to the input of the electromagnet scanner, and the second generator output with the first input of the Registrar of the spectrum, and the second input of the Registrar of the spectrum is connected to the output of the sensor to address the parameters, describing the operation of the device. The device comprises a device for scanning and analysis of a beam, made in the form of an electromagnet scanner 1 with a vacuum chamber 2 having an outlet port 3, the generator excitation current 4, made with two inputs 5, 6 and two outputs 7, 8, programmer sweep 9 output 10, programmer 11 to the outlet 12, the Registrar of the spectrum with 13 inputs 14, 15, the current sensor is analyzed beam 16, the trajectory of the beam 17.

A-A - a axis of the beam, is not rejected by the scan - the Central axis of the electromagnet.

B-B - a plane passing through the current sensor 16 is analyzed beam perpendicular to the axis A-A and plane sweep, coinciding with the plane of the drawing.

a is the effective length of the magnetic field of the electromagnet scanner, see

l is the distance from the edge region of the magnetic field to plane B-B, see

L= l+a/2 is the distance from the mean plane of the electromagnet scan to plane B-B, see

D is the distance from the axis A-A through current sensor is analyzed beam, see

The proposed device operates alternately in the exposure mode and the control mode of the energy spectrum of the beam. In exposure mode: programmer 9 fo the Torah 4. Generator 4 excites the electromagnet scanner 1 and provides the scan beam at the irradiation object. One of the trajectories of the beam 17 is shown in Fig. 1.

In the control mode of the energy spectrum in the pauses between cycles of irradiation program from the programmer analysis 11 is fed to the input 5 of the current generator 4, which excites the electromagnet sweep 1 running in this mode, the function of the analyzing electromagnet. To the input 14 of the Registrar spectrum 13 from the output 8 of the power generator 4 receives the program change in time of the excitation current of the electromagnet scanner 1, which determines the change in time of the magnetic field induction B in the working gap of the electromagnet 1. The change with time of the magnetic field B is connected with the change of kinetic energy of particles falling on the current sensor 16, the signal from which is fed to the input 15 of the Registrar spectrum 13.

For example, the programmer analysis 9 can form the law of linear growth in time of the magnetic field B in the working gap of the electromagnet 1. For small values of induction B due to weak deflecting magnetic field to the current sensor 16 installed at a distance D from the Central axis A-A of the electromagnet, will reach only the TIC will increase. The value of the current sensor 16 is associated with the energy of the particles, and obtained from the Registrar 13 the relationship of these values gives the energy spectrum of the beam.

On the known geometrical parameters shown in Fig.2, determine the value of the curvature radius R of the trajectory of a particle in a magnetic field

(1)

(Sherstnev L., Electron optics and electron-beam devices, M.: Energy, 1971, S. 214). The value of R is a constant such magnetic spectrometer, it defines the relationship between the kinetic energy W of the singly charged particles entering the current sensor 16, and the induction B in the air gap of the electromagnet 1. This relationship is described by the known formula

< / BR>
(Moskalev Century A. and others, Measurement of parameters of charged particle beams. - M. : Atomizdat, 1980, S. 70),

where

W is the kinetic energy of the particles, eV;

E0- the rest energy of the particle, eV;

B - the magnetic field in the working gap of the electromagnet sweep, HS;

R is the radius of curvature of the particle trajectory in a magnetic field, see

The application of the proposed device, for example, in the sterilization installations with electron beam will be excluded from the separate installation of the analyzing magnet device and the second radiation protection of the entire installation.

Device for irradiating objects with a beam of charged particles, comprising a device for scanning the beam vacuum chamber, with the outlet box, the electromagnet scanner, generator excitation current of the electromagnet scan and programmer sweep associated with the generator excitation current, characterized in that it contains a programmer analysis of the beam, the Registrar of the spectrum of the beam with the first and second inputs and sensor are analyzed beam, made in the form of collector inverter and mounted in the plane sweep for the final window of the vacuum chamber away from the Central axis of the electromagnet scanner and generator excitation current of the electromagnet is supplied with two inputs and two outputs, and the first one of its inputs connected to the output of the programmer sweep of the beam, and the second input - output device analysis, the first output of the generator excitation current connected to the input of the electromagnet scanner, and the second generator output with the first input of the Registrar of the spectrum, the second input of the Registrar of the spectrum is connected to the output of the sensor is analyzed beam.

 

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