Device for irradiation and method for correcting beam position

FIELD: high-voltage charged particles accelerators.

SUBSTANCE: device has high-voltage rectifier transformer, including high-voltage transformer, consisting of magnetic duct, rods with primary winding of which are encased in electrostatic screens, sectioned secondary winding, rectifier elements, inserted between sections of secondary winding, accelerator pipe with charged particles source, safety screen, inside safety screen compensation coil is mounted with possible presence of axial component of magnetic field in counter-phase to field vector, moving charged particles beam from accelerator pipe axis. Correction method includes forming by high-voltage rectifier transformer of high-voltage accelerator potential, initiation of charged particles flow in charged particles source, acceleration of charged particles flow in sectioned accelerator pipe, forming of beam of charged particles, while additional magnetic field is formed using compensating coils, mounted on external surface of safety screen.

EFFECT: broader functional capabilities, higher reliability, simplified construction, higher efficiency.

2 cl, 8 dwg

 

The invention relates to high-voltage accelerators of charged particles and can be used as a source of ionizing radiation for radiation-chemical processes in various sectors of the national economy, in particular for exposure ruanruan materials by electron beam, to obtain the powerful streams of x-ray radiation to sterilize food, medicines, etc.

Known high-voltage transformer accelerator of charged particles (A.S. No. 698480 - C1)containing accelerator tube placed on the spatial axis-symmetric magnetic circuit of the transformer with an even number of rods, connected by yokes. On each of the rods has a primary and partitioned secondary winding. Partitioned secondary winding connected to the rectifier elements, which are placed evenly along the height of the secondary winding. The total height of the sections of the secondary winding is equal to the height of the accelerator tube. The terminals of the transformer are divided into groups, private decision on three of the rod in the group, the primary winding separate groups included in the three-phase network, the windings are located on diametrically opposite rods included so that the scattering field winding on the same core is compensated by the scattering field is diametrically the second winding of the opposite rod. Theoretically, each time field on the axis of symmetry of the transformer is fully compensated, i.e., no. Thus is achieved the conditions for transporting the charged particle beam in the accelerator tube accelerating potential, created by a set of elements on the basis of two 3-phase transformers in parallel is included in the total load.

Closest to the proposed device for irradiation is a device for irradiation (Powerful electron accelerator for industrial radiation and chemical plants. Akulov CENTURIES and other presentations of the Second all-Union conference on application of accelerators in the national economy (October 1-3, 1975). T1, L., NIIEFA, 1976, str-141 - C2).

Device for irradiating contains: high voltage 3-phase transformer, the accelerator tube, placed on the spatial axis-symmetric magnetic circuit. In the lower part of the rods is the primary winding and partitioned secondary winding connected to the rectifier elements. Each core with a primary winding placed in an electrostatic screen and its upper part is free from the winding. The terminals are connected by upper and lower yokes. The upper yoke is closed the screen. Height partitioned secondary winding is equal to the height of the accelerator tube. To the electrodes of the accelerator the logging feature magnetic screens, which limit the penetration of the magnetic field of the windings of the transformer inside the volume of the accelerator tube. Completely, i.e. with 100%shielding of the accelerator tube cannot be performed, because between the magnetic shields should be insulating gap and dielectric strength must be equal to the electric strength insulation between the nearest electrodes of the accelerator tube. Together with the focusing coil and the device scan beam, these magnetic screens create the necessary conditions for the beam transport to the target, and the ability to adjust the beam of charged particles in the beam line.

Calculations and experiments have shown that even at the current 50mA difficulties with posting beam accelerator tract. Increases tolosana to the electrodes of the accelerator tube that leads to the heating of the electrodes. Increased heating of the electrodes can lead to loss of tightness of the accelerator tube. With increasing power the device for irradiation of negative factors will increase.

A known solution to (P1) solves the problem of compensation of stray fields from high-voltage transformer, which displace the charged particle beam with the axis of the accelerating tube, however, this solution increases the complexity of the device, because the need is about to make a double set of nodes of the high voltage transformer, requires high accuracy in identity construction elements of the high voltage transformer (square-section rods of the transformer, the number of turns of the windings etc) and installation of the device. Slight variations of these parameters will lead to the emergence of the deflecting field, which will shift the beam with the axis of the accelerating tube and which will not allow you to get the maximum device settings (power, reliability, efficiency and so on).

Using the known solution of (P2), which most closely claimed, it is possible to reduce the influence of stray fields from high-voltage windings of the transformer, however, when the power device for the irradiation of several hundred kilowatts, these measures will not be enough, because tolosana will increase and the reliability of the accelerator tube will fall or even be impossible.

The main problem solved by using the inventive device for irradiation, is the adjustment of the position of the charged particle beam in the accelerator tube due to compensation of stray fields from high-voltage transformer, affecting the position of the beam of charged particles, increase reliability, and simplify the design of the device for irradiation.

In the inventive device for irradiation, containing high-voltage transformer-rectifier, comprising a high voltage transformer, consisting of magni is aproved, the rods with the primary winding of which is placed in an electrostatic screens, partitioned secondary winding terminals of the transformer, the rectifier elements connected between the sections of the secondary winding, the accelerator tube with a source of charged particles, security screen, inside of which is installed the compensating coil with the possibility of finding the axial component of the magnetic field in opposition to the field vector, shifting the charged particle beam with the axis of the accelerating tube, and in the case of installation of the accelerator tube on the axis of symmetry of the magnetic circuit of high voltage transformer, the number of compensating coils is divisible by the number of terminals of the high voltage transformer, and if the accelerator tube is offset from the axis of symmetry of the magnetic circuit of high voltage transformer, the number of compensating coils is the number of rods and additional compensating coil is fitted against the offset of the accelerator tube.

The diameter of the compensating coils is determined by the ratio:

F<D<1/2H, where

F - diameter of the electrostatic screen of the terminal of the transformer;

D - the greatest diameter of the compensating coil:

N - the length of the accelerating tube, and can repeat the shape forming surface of the security screen and executed in the form of an ellipse, with large and small the axes of the ellipse are within:

F<O<1/2H

F<O1<L, where

F - diameter of the electrostatic screen of the terminal of the transformer,

About the length of the major axis of the ellipse,

N - the length of the accelerating tube,

O1- length of the minor axis of the ellipse,

L is the distance in light between two adjacent rods. In the particular case between the compensating coils and the security screen has a closed magnetic screen, and at the height of the accelerating tube can be installed several rows of compensating coils and several rows of closed magnetic screens, thus compensating coil is mounted on the frame for independent adjustment relative to the accelerating tube.

In addition, the compensating coils have an independent power supply system and in the particular case, can be associated with the primary winding of high voltage transformer with a capability of compensation of the radial component of the magnetic field from him.

The method of adjusting the position of the beam device for irradiating, including the creation of a high-voltage transformer-rectifier high voltage accelerating potential, initiating flow of charged particles in the source of charged particles, accelerated stream of charged particles into the accelerator tube, the beam of charged particles, is that there is an additional magnetic on the e compensating coils, mounted on the inner surface of the security screen.

Figure 1 shows the device for irradiation with a high-voltage transformer-rectifier, the magnetic circuit of which contains three core figure 2 shows a cross-section of the device for irradiation, containing three rod with a number of compensating coils that are multiples of the unit (number of coils 3, the number of rods 3), figure 3 shows a cross section of a device for irradiation, containing three terminal magnetic circuit with the number of compensating coils in multiples of 2 (the number of coils 6, the number of rods 3), figure 4 shows a cross-section of the device for irradiation, containing three rod with additional compensating coil installed biased against the accelerator tube, Figure 5 shows a device for irradiation with compensating coils in the form of an ellipse, set in two rows, figure 6 shows the circuit for compensating coils for 3-phase magnetic system with three terminals and the number of coils in multiples of the unit (the number of compensating coils is equal to three), which are connected to the terminals of the primary winding, figure 7 shows the circuit for compensating coils for 3-phase magnetic system with three terminals and the number of coils in multiples of the unit (the number of compensating coils is equal to three), which are connected through special the e power supply units, on Fig - shift diagram of a charged particle beam with the axis of the accelerating tube along its length.

A device for the irradiation of accelerated particles consists of a high-voltage transformer-rectifier 1, containing the magnetic core 2 and includes, in the particular case, three rod 3 and two yoke 4. (Figure 1). The rods 3 are wound the primary winding 5. Pivot ball suspension 3 with the primary winding 5 is placed in an electrostatic screen 6. The secondary winding 7 of the high-voltage transformer-rectifier partitioned. The outside section of the secondary winding 7 of the rods 3 are covered by the gradient of the ring 8. On one of the rods 3 of the magnetic coil placed 9 power source of charged particles 10. Sections of the secondary winding 7 is connected rectifier elements 11. Inside the gradient of the rings 8 are installed accelerating tube 12 with a source of charged particles 10. In the private solution accelerator tube 12 is installed on the axis of symmetry of the magnetic circuit 2 (Fig.1,2,3).

Screen 13 aligns the electric field between the secondary winding 7 and the yoke 4 of the magnetic circuit of the transformer-rectifier. Accelerating tube 12 consists of electrodes 14 of the insulator 15. Each electrode 14 of the accelerator tube 12 may have a circular magnetic shields 16.

On the drift section 17 of the accelerator tube 12 is installed the focusing coil 18, at the entrance to the vacuum Cham is ru 19 posted by device scan beam 20 of charged particles. The vacuum chamber 19 has an outlet window 21, providing technological use of a beam of charged particles.

High-voltage transformer-rectifier device for irradiation with the accelerator tube 12 is placed in the security screen 22, which provides the necessary system settings for high-voltage potential, as well as the initiation, formation and acceleration of a charged particle beam.

Inside the security screen 22 is installed in the private design, two rows 23 and 24 of the compensating coils 25 and the number of coils in multiples of the number of rods between the security screen 22 and compensating coils 25 each series 23 and 24 coils placed closed magnetic shield 26, which improves the connection between the compensating coils 25 of the same number. Compensating coil 25 is fixed to the frame 27 with the possibility of adjustment relative to the accelerating tube 12. The frame is installed on the bottom plate 28 of the transformer-rectifier 1 (Figure 5). Adjustment is performed by the devices move 29. Compensating coil 25 can repeat the shape forming surface of the security screen 22 and to have a shape close to an ellipse. This form of compensating coils 25 provides a reduction of the dimensions of the security screen 22 and can capture a larger area of the accelerator trunk is 12 along its length, the position of the beam on the axis you want to adjust that will allow you to use fewer rows compensating coils 25 or to use only one series compensating coils 25. Additional compensating coil 30 (Figure 4) installed at a minimum distance from the accelerating tube 12 at its installation is not on the axis of symmetry of the magnetic circuit 2.

Compensating coil 25 is connected to the power supply units 31 (7), which regulate the power settings of the compensating coils 25 depending on the mode of the device for irradiation. In the private decision device for irradiation, the coils are connected to the terminals of the primary winding 5 (6), located on the rods 3, a field which the compensating coil 25 offset.

A device for the irradiation of works in the following way. High-voltage transformer-rectifier 1 generates a high voltage accelerating potential on the screen 13. The source of charged particles 10 that receives the power from the coil 9, initiates the flow of charged particles, accelerated in the accelerator tube 12. The electrodes 14 of the accelerator tube 12 generates a beam of charged particles, which at the same time shield the charged particle beam in the accelerator tube from stray fields from high-voltage windings of the transformer-rectifier 1. The shielding action of the electrodes 14 m who should be increased, adding circular magnetic shields 16. Magnetic shields 16 may not be installed on the electrodes 12 of the accelerator tube 10 without a gap, since the insulating gap between them, electric strength which should not be less than the electric strength of one insulating gap of the accelerator tube 12. In the gap between electrodes 14 and the magnetic shields 16 penetrates the scattering field windings of high-voltage transformer.

The resulting magnetic field vector scattering is the sum of the vectors of the stray fields from the windings of phases a, b, C. each time the total magnetic field compensating coil K1To2, K3must be the magnitude and direction such as to compensate for the bias field on the axis of the accelerating tube 12. This is achieved, for example, the fact that the compensating coil To1To2To3include parallel and out of phase primary windings 5 phases a, b, C of the transformer-rectifier 1 (2,6). The parameters of the generated compensating coils K1To2To3magnetic field, consistent with the parameters of the primary winding, will automatically create a resultant magnetic field, watching the changes in the parameters of the primary winding and the high voltage transformer-rectifier in General.

When the number of compensating for the carcasses in the device for irradiation, fold the two (Figure 3), the compensating coil pairs included:1-K4;2-K5;3-K6to the primary windings of the respective phases transformer-rectifier, but can be connected to the power supply units 31 (Fig.7).

Similarly, pairs of K1-K4, K2-K3connect to the power supply units 31 of the coil 25 and an additional coil 30, in case the location of the accelerating tube 12 is not on the axis of symmetry of the magnetic circuit 2 (Figure 4).

When connecting the compensating coils through the device power supply 31 opportunities for adjustment of beam particles, because the power settings of the compensating coils can be individualized for each compensating coil. This is also necessary due to the fact that the parameters of the rods (cross-section, number of turns etc) may not be identical.

Especially the strong influence of the stray field has in the initial stage of acceleration of charged particles at the source of charged particles 10, because the beam has not yet been formed. At the other end of the accelerator tube, the influence of his less, because the beam has a high energy. Therefore, adjustment of the beam position possible to make only in the area of the source of charged particles 10 having a single row of compensating coils 25 (Figure 1).

The characteristic graph of the displacement of the beam in the charger, side buttons is different particles with the axis of the accelerating tube 12 along its length presents on Fig. Curve the field approximately in the middle part changes sign as the field changes its direction relative to the accelerating tube 12 in its second part. The offset is already accelerated beam in this part of the accelerating tube depends on the quality of the beam shaping in the area of the source of charged particles 10 and has values that are within the valid values.

In cases where it is impossible to obtain satisfactory results the magnitude of the displacement in this part of the accelerating tube, taking into account the beam deflection, it is necessary to create different direction compensating magnetic field in one and the other parts of the accelerator tube. This is a number 24 of the compensating coils 25 (Figure 5).

For precision adjustment of the position of the charged particle beam can be N rows compensating coils, which have their own individual power settings from the device power supply 31. For the same purpose is the moving device 29 individual adjustment of the compensating coils 25. The system configuration is performed in the time adjustment device for exposure using a magnetic field sensor mounted on the axis of the accelerating tube 12. Moving the compensating coil 25, as well as changing the power settings of the compensating coils 25 through a power device 31 (Phi is .7), achieve maximum effect compensation of the magnetic field on the axis of the accelerating tube.

The connection of the compensating coils to the terminals of the primary winding is a simpler solution, but it may not provide adjustment of the position of the beam of charged particles at different modes (different accelerating voltage) of the device for irradiation.

There is a method of adjusting the position of the beam of charged particles in the beam line consisting of a source of charged particles, accelerating tube with electrodes, the focusing coil, the device scanner beam and outlet ports, namely, that by moving relative to the beam axis of the focusing coil or pole electromagnets device scan beam, achieve the maximum beam current for foil outlet ports. While focusing coil can be moved along the height of the drift section of the accelerator path (P2). The device scanner provides scanning of the beam in the plane of the outlet box so that the foil withstand the maximum service life without losing its settings (tightness), changes the size of the field of irradiation, provides protection foil outlet box with emergency stop device for the irradiation. Thus, these devices affect the charged particle beam with Povstannya their magnetic fields.

In addition, the charged particle beam in the accelerator tube is shielded from stray fields from magnetic screens mounted on each electrode of the accelerator tube. Magnetic screens relative to each other must be installed with an insulating gap, which provides a dielectric strength equal to the electric strength of the insulation gap surface between adjacent electrodes of the accelerator tube. The gap should be minimal, the large size of the gap will lead to the penetration of the magnetic field inside the volume of the accelerator tube and the displacement of the charged particle beam with its axis.

There is a method of adjusting the position of the charged particle beam solves the problem of beam transport for the foil outlet ports, however, requires additional magnetic shields, which must be installed on the electrodes of the accelerator tube, to protect the beam from stray fields, but even at their installation problem posting beam accelerator tract is not fully solved.

There is a method of adjusting the position of a charged particle beam, in which, while retaining all methods of position control of the beam of charged particles in the beam line, namely, the accelerator tube, the focusing coil, the device scanner beam, creates an additional magnetic field, which compensate for the range of magnetic field, shifting the beam with the axis of the accelerator path of the device (C1). Compensation of the magnetic field occurs due to the installation of the terminals of the transformer with the same winding data symmetrically to the beam axis when enabled, primary windings on these rods so that the leakage field are directed oppositely. When 3-phase system, which is simple and promising to use in such devices, such additional rods shall be three, so that each pair of rods compensated field scattering each other.

Using a known method (C1) adjusting the beam position, which is closest to the claimed device, you can resolve the issue of compensation of stray fields, shifting the beam with the axis of the accelerating tube, however, the leakage field to fully compensate difficult because of the impossibility of making identical cores with windings, which in turn will create not compensated field, which will be the more than it will increase the capacity of the device for irradiation.

The main problem solved by using the proposed method of adjusting the position of the beam of charged particles, is the adjustment of the position of the charged particle beam in the beam path of the device for irradiation.

In the present method of adjusting the position of the beam device for irradiating, vkluchaya the creation of a high-voltage transformer-rectifier high voltage accelerating potential, initiating flow of charged particles in the source of charged particles, accelerated stream of charged particles into the accelerator tube, the beam of charged particles creates an additional magnetic field compensating coils mounted on the inner surface of the security screen.

The correction method is that the inner surface of the security screen 22 are compensating coil 25 (Fig 1). Created compensating coils 25, the resulting magnetic field interacts with the magnetic field scattering from the high-voltage windings of the transformer-rectifier 1, adjusts the position of the charged particle beam on the axis of the accelerating tube. The method of adjusting the position of the beam the most promising in a three phase system, because it is most widely used, economical, simple, does not create unbalance in the supply network and so on, although it can be used for other supply systems.

In 3-phase transformer (2; 3) the resulting magnetic field moves with the axis of the accelerating tube 12, the beam of charged particles. Compensating coil 25 connected in antiphase to the terminals of the primary winding 5 will also create a magnetic field. Thus, the stray magnetic field from the coils of the transformer will be compensated for or reduced to a minimum Zn the values, which will not lead to a significant shift of the beam with the axis of the accelerating tube. A small offset can be adjusted by other elements of the accelerator path: electrode accelerating tube 12, the focusing coil 18 and the device scanner 20 of the beam of charged particles to obtain the desired effect on the outlet window 21 of the vacuum chamber 19.

Accelerating tube 12, electrodes 14, to generate a beam of charged particles emitted from the source of charged particles 10.

The focusing coil 18 in the device for irradiation necessary to control the spot size of the charged particle beam on the foil outlet port 21. To a small extent, the focusing coil may affect its location in the outlet window 21 of the vacuum chamber 19.

Device scan beam 20 affects the position of the beam of charged particles on the foil outlet port 21. Shifts it as the window width and along its length.

All of these elements of the accelerator tract and the source of charged particles affect the passage of a charged particle beam in the accelerator system and the location of the beam on the foil graduation open.

The introduction of the compensating coils contributes to the same goal. Compensating coil 25, influencing the formation of a charged particle beam in an initial stage of acceleration, adjusting his position in uskoritel the Noah tube 12, become an important element of the device for irradiation, and the method of adjusting the position of the charged particle beam in the accelerator tube device for irradiation contributes to its power.

1. The device for irradiation, containing high-voltage transformer-rectifier, comprising a high voltage transformer comprising a magnetic core, the rods with the primary winding of which is enclosed in an electrostatic screens, partitioned secondary winding, the rectifier elements connected between the sections of the secondary winding, the accelerator tube with a source of charged particles, security screen, characterized in that inside the security screen installed the compensating coil with the possibility of finding the axial component of the magnetic field in opposition to the field vector, shifting the charged particle beam with the axis of the accelerating tube.

2. The device according to claim 1, characterized in that the accelerating tube is installed on the axis of symmetry of the magnetic circuit of high voltage transformer, while the number of compensating coils is divisible by the number of terminals of the high voltage transformer.

3. Device according to claims 1 and 2, characterized in that the accelerating tube is offset from the axis of the magnetic circuit of high voltage transformer, while the number of compensating coils equal to the number of terminals, and further the additional compensating coil is fitted against the offset of the accelerator tube.

4. Device according to claims 1 to 3, characterized in that the diameter of the compensating coils is determined by the ratio

F<D<1/2N

where F is the diameter of the electrostatic screen of the terminal of the transformer;

D - the greatest diameter of the compensating coil;

N - the length of the accelerating tube.

5. The device according to claims 1 to 4, characterized in that the compensating coil follows the form of the generatrix of the surface of the security screen.

6. Device according to any one of claims 1 to 5, characterized in that the compensating coil made in the form of an ellipse with major and minor axis of the ellipse is within:

F<<1/2H;

F<O1<L,

where F is the diameter of the electrostatic screen of the terminal of the transformer,

About the length of the major axis of the ellipse,

N - the length of the accelerating tube,

About1- length of the minor axis of the ellipse,

L is the distance in light between two adjacent rods.

7. Device according to any one of claims 1 to 6, characterized in that between the compensating coils and the security screen has a closed magnetic screen.

8. Device according to any one of claims 1 to 7, characterized in that the height of the accelerator tube mounted N series compensating coils and N rows of closed magnetic shields.

9. Device according to any one of claims 1 to 8, characterized in that opencirrus coil is mounted on the frame for independent adjustment relative to the accelerating tube.

10. Device according to any one of claims 1 to 9, characterized in that the compensating coils have an independent power supply system.

11. Device according to any one of claims 1 to 9, characterized in that the compensating coil connected to the primary winding of the transformer with the possibility of compensation of the radial component of the magnetic field from him.

12. The method of adjusting the position of the beam device for irradiating includes the creation of a high-voltage transformer-rectifier high voltage accelerating potential, initiating flow of charged particles in the source of charged particles, accelerated stream of charged particles in a partitioned accelerator tube, the beam of charged particles, characterized in that create an additional magnetic field compensating coils mounted on the inner surface of the security screen.



 

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