The cooling method of the window foil electron beam accelerator and device for its implementation

 

(57) Abstract:

The invention relates to a method and apparatus for cooling foil exit window of the accelerator electron beam. The cooling method of the window foil, providing the output electron beam from the accelerator electron beam scanning type, characterized by the fact that carry out a blast of cooling gas on the scanned electron beam surface on both sides for cooling the primary window foil. In the center of the primary window foil, the flow of cooling gases reversiruyut and provide circulation of cooling gases by suction of cooling gases on both sides of the surface scanned by the electron beam, allowing at the same time cools the secondary window foil. The accelerator contains a primary window foil of the double window and a secondary window foil. The technical result is an effective cooling of both Windows primary window foil without increasing the number of cooling gases. 2 S. and 6 C.p. f-crystals, 6 ill.

The technical field

The present invention relates to a method and apparatus for cooling foil exit window of the accelerator electron beam, and more particularly to a method and apparatus for Oy used for processing gas, coming out of the boiler a boiler or similar installation.

Art

Accelerators electron beams are widely used in various industries. So, in accelerators and electron beams used for treatment of materials by irradiation in the atmosphere, for example, the exhaust gas evaporator, e-beam, accelerated to high speed in the vacuum of the accelerator shall be dumped into the atmosphere. For this purpose, as Windows uses a foil thickness of 30 to 50 microns of pure titanium or titanium alloy. In addition, when the density of electron current increases to obtain the best effect of irradiation, it must use the accelerator with electron current of several hundred mA.

In this type of accelerators of the energy is absorbed when the electron beams pass through the foil exit window, which results in heating of the foil and possible damage. To prevent this window to output the electron beam is of rectangular shape and the electron beam is scanned along the axis of the rectangular window. Due to this electron beam is not concentrated in one place foil. At the same time, nitrogen or similar gas blow crome, when the electron beam has a current of several hundred mA, the electron beam advanced scan and along the short axis of the rectangular window to zoom let them distance, thereby increasing the cross-sectional area of the rectangular window. However, since the foil is used to isolate the vacuum in which there is an acceleration of the electron beam, if you increase the cross-sectional area of outlet window area, then increases and the force acting on the foil. This will cause the foil to be intensely bonded to the inside of the vacuum part of the accelerator. To prevent this, in the center of the window foil to hold the foil accelerator equipped with a support. Thus, the window area is divided into two areas. This structure is known as the dual window.

Moreover, in the window to protect the window foil in the process, use double foil, including primary foil and secondary foil, for example, when processing the exhaust gas evaporator, which can get sulfuric acid and nitric acid.

The design is known accelerator electron beam is shown schematically in Fig. 3. the d in the direction of the short axis of the window). Position 1 is the high-voltage energy source, 2 - high voltage cable, 3 - accelerating tube, 4 - scanning coil, 5 - scanning tube, 6 - flange for installation of the window foil, 7 - channel for the exhaust gas, 8 - electron beam, 9 - flow exhaust gas 10 is the first window is the primary window foil, the 11 - second window primary window foil and 12 - location deviated by the electron beam. In conventional accelerator electron beam, using dual window or dual window foil, the primary foil 14, 15 and the secondary foil 16 are cooled with gas, which is blown from the corresponding sides of the rectangular Windows along the direction of its long axis opposite each other. In this case, because both the double Windows of the primary foil should be cooled at the same time, the Central support 13 are moved away from the end surface of the flange 25 that secures the window in the side of the vacuum so that the cooling gases 19, 20 encountered both Windows primary window foil, the first window 14 and the second window 15.

Cooling gases 19, 20 fed from the respective slits 17, 18 for blowing cooling of the primary window and a secondary window, respectively.

In a known cooling method, when the size of Oaktree beam, the second window 15 primary window foil may over heat and be damaged, because the cooling gases do not reach enough of the second window is the primary window foil. The increased flow of cooling gases to resolve this problem leads to the use of the injection device, which should have a large capacity and uneconomical.

In addition, the known method of cooling, which uses blast from both sides, the mechanism 29 of the reversing gas attached from the atmosphere to the Central support 13, is placed in the vacuum part, as shown in Fig. 6, since the window foil is located between the support 13 and the mechanism 29 reversal. Thus, the mechanism of the reversal cannot be directly assigned PA Central support on the plot window foil. Thus, because the mechanism 29 reversing extended (for example, 1 to 3 m) and is installed separately on the Central support on the plot of the short axis of the window mechanism 29 reversal is heated and expands, which leads to its deformation during operation of the accelerator due to scattering when the collision of the electron beam, so that between the Central support and mechanism for reversing avno to change direction to the opposite. The gap can become clogged with dust, the gas flow will be zavalatica, and in some cases, the foil may be damaged. In addition, the cooling mechanism shown in Fig. 6, is not used in those cases, when using a secondary window foil.

The present invention is the task of creating a method and device for cooling window foil, which would provide sufficient cooling of the window foil, even if the length of window area increases in the direction of the short axis of the window, by increasing the distances, which are electron beams.

Another object of the invention is to provide a method and device for cooling window foil, which additionally avoids the deformation mechanism of reversal caused by interaction with multiple electron beam, and thus to support the smooth regime changes the flow direction of the cooling gas on the reverse.

Another object of the invention is to provide a method and device for cooling window foils, which additionally allow cooling at the same time the primary window foil and the secondary window foil without the use of the according to the first aspect of the invention proposes a method of cooling the window foil for output electron beam from the accelerator electron beam scanning type, includes a scanning tube of the primary window foil type dual window attached to the outlet of the scanning tube, and the secondary window foil, located on the part of the atmosphere from the primary window foil, characterized in that it includes blowing a cooling gas onto the surface to be scanned by an electron beam, with both sides for cooling the primary window foil, changing the flow direction of the cooling gas on the opposite in the center of the primary window foil and the circulation of the cooling gas by suction of cooling gases on both sides of the surface scanned by the electron beam, for simultaneous cooling due to this secondary window foil.

According to another aspect of the invention, in the cooling method of the window foils in this way the center of the primary window foil is supported by a Central support located within the scanning tube of the accelerator while changing the flow direction of the cooling gas on the opposite at the expense of performing the primary window foil curved shape and special shape of the remote end of the Central support.

According to another aspect of the image is ment tube with flange fixing the foil, and the curvature of the primary window foil is supported by the location of the remote end of the Central support flush with the end surface of the flange, fixing of window foil, or acting in the direction of the atmosphere relative to the end surface of the flange.

According to another aspect of the invention, an apparatus for the cooling of the window foil accelerator electron beam scanning type, comprising a tube, a primary window foil double window, attached to the outlet of the scanning tube, the secondary window foil, placed on the part of the atmosphere from the primary window foil flange to attach the primary window foil to the outlet of the scanning tube, a Central support located in the scanning tube, to support the primary window foil and slit for blowing cooling gas supplying cooling gas to the surface of the window foil, characterized in that what cracks for blowing cooling gas is made along both sides of the window foil opposite each other so that the cooling gases change direction of motion is reversed at the center of the primary window foil.

ranks of the window foil is attached to the outlet of the scanning tube with flange for installation of a window, and the remote side of the Central bearing is flush with the end surface of the flange for installation of the window foil or acting in the direction of the atmosphere against the end face of the flange. According to an additional aspect of the invention specified in the device for cooling the window foils along both sides of the secondary window foil opposite to each other provided with channels for suction, providing the output of the cooling gases.

According to an additional aspect of the invention specified in the device for cooling the window foils Central support includes channels for cooling water, made near the remote end and along it.

According to another additional aspect of the invention specified in the device for cooling the window foils on the outer perimeter of the primary window foil is fixed opposite the flange to install Windows using the retaining plate.

According to the invention the disadvantage of the prototype can be overcome due to the homogeneous reversal of the cooling gas in the right side and the left side with a simple mechanism. That is, in the conventional system of unilateral blast when to increase the distance, passing electra window width, the cooling gases do not reach the second window is the primary window foil, and therefore, cooling can be carried out effectively, if not increased the amount of gases by increasing the gap width of the channel.

In the present invention the system with two-way blast allows to obtain an effective cooling of both Windows primary window foil without increasing the number of cooling gases.

In addition, in contrast to the known method of cooling with two-way blast reversing mechanism formed part of the Central support. Namely, the remote end of the Central support acts in the direction of the atmosphere, and the shape of the remote end as a reversing mechanism for cooling gases is made such that it is optimal to reverse the cooling gases and to avoid possible collision with scattered electron beams. This differs from the usual method of installing a separate reversing mechanism from the atmosphere on the Central support located in the vacuum. Therefore, the window foil can be cooled without deformation of the reversing mechanism due to thermal expansion and heat, and can result in to avoid damage to Foll the basics, primary and secondary window foil can be cooled simultaneously without the use of bulky equipment in contrast to conventional cooling method.

Brief description of drawings

The above aspects, features and advantages of the present invention will become more apparent from the following description given with reference to the accompanying drawings, in which

Fig. 1 depicts schematically the cooling device of the foil according to the invention;

Fig. 2 depicts a General view of the site window foil according to the invention;

Fig. 3 depicts a scheme known accelerator electron beam;

Fig. 4 depicts a section along the line IV-IV in Fig. 3 of the known device;

Fig. 5 depicts schematically a known cooling device;

Fig. 6 schematically depicts another known cooling device, in which there is no secondary window foil.

The preferred embodiment of the invention

Position 5 (Fig. 1 denotes a scanning tube for electron beams, 6 - flange for installation of the window foil on the bottom of the scanning tube and made it in one piece, 7 - channel for the exhaust gas, 8 - electron beams, 9 - thread othodyashie primary window foil, 14 - the first window is the primary window foil 15 - second window primary window foil, 16 - secondary window foil placed on the part of the atmosphere relative to the primary window foil, 17 - slotted channel for air to supply cooling gas to the surface of the window foil primary window foil, 17' - suction channel for output cooling gases 19 - the flow of cooling gases, 21 - channel suction/blowing, 24 - channels for cooling water, made in the Central support 13 along its longitudinal direction, a 27 - remote side of the Central support 13, which is placed so that it is flush with the front surface or the bottom surface of the flange 6 to install the foil or acts in the direction of the atmosphere relative to the end surface of the flange.

Position 6 (Fig. 2) denotes a flange for mounting a window foil, 25 - plate, retaining foil, 26 - primary window foil, 27 - remote side of the Central support 13 and 28 - channel of the cooling medium.

According to the invention, as shown in the drawings, the remote end 27 of the Central support 13 is located so that it is flush with the end surface of the flange 6 to install the foil or acts in the direction of atmosph sides of the primary window foil so they are opposite each other, and the channels 17' for output of the cooling air are located along the longitudinal sides of the secondary window foil 16 so that they are opposite each other.

The operation of the device according to the invention will be described below. Cooling gases 19 (Fig. 1) originating from channel 21, respectively, for cooling the primary window foil blown on the first and second window 14, 15 primary window foil from cracks to blast 17, respectively. Submitted thus cooling the gases 19 flow along the surfaces of the foils, bent under the action of pressure difference between vacuum and atmospheric pressure, cooling while the first and second window 14, 15 primary window foil, respectively. Then the cooling gases collide with the remote end 27 of the Central support 13, which is flush with the end surface of the flange 6 for installation of the window foil or acts in the direction of the atmosphere in regards to this end surface of the flange, and then reversed diagonally and down the stream, interacting with each other, resulting in the change of flow direction. Then they are faced with the secondary window foil 16, flowing along its surface and includes at proteopedia remote end of the Central support acts in the direction of the atmosphere from the end surface of the flange for installation of the window foil and if the protruding length is within 3% of the length of the short axis area of the primary window, the voltage transmitted to the primary window foil, may be limited to a relatively small range, and it is the preferred option.

As shown above, due to the injection of cooling gases 19 from the slits 17 to blast on opposite sides of the primary window foil opposite each other, and reversing the flow of cooling gas in the Central zone of the primary window foil is possible to obtain a uniform flow and cooling of the first window 14 and the second window 15 primary Windows Noah foil which is bent under the action of pressure difference between vacuum and atmospheric pressure. This ensures efficient cooling of the primary window foil despite the increase in length of the short axis or the width of the primary window foil. In addition, because the mechanism of reversal of the cooling gas 19 is formed a Central part of the support 13, i.e., the remote end 27 of the Central support, even if the scattered electron beams impinge on the reversing mechanism, the deformation of this reversing mechanism is relatively small. Therefore, not smestorage simultaneous cooling of the secondary window foil 16 with reversionary cooling gases.

In this regard, the reversal of the cooling gas in the Central zone of the primary window foil can be effective, even if the remote end 27 of the Central support 13 is located so that it extends slightly to the side of the vacuum from the end surface of the flange 6 to install the foil.

This reversal of flow of cooling gases can be reduced by selection of the distance between the primary window foil and the secondary window foil and the width of the slits for blowing cooling gas and an additional distance, which is the Central bearing in the direction of the atmosphere. In addition, the relation in which electron beams scattered on the primary window foil, hit the Central support can be reduced by changing the shape of the remote end of the Central support. In this regard, as shown in Fig. 2, performing the shape of the flange 6 and the plate 25 that holds the window foil corresponding to the shape of the remote end 27 of the Central pillars jutting out towards the atmosphere, the primary window foil can be mounted on the flange 6 is bent, and the end parts of the flange foil is not curved, and this supports ageing (tightness). POV, since, as described above, the dual window primary window foil can uniformly be cooled, and, in addition, at the same time can be cooled by a secondary window.

As described above, according to the invention the application of the system of bilateral injection allows efficient cooling of both Windows primary window foil without increasing the number of cooling gases.

In addition, window foil can be cooled without deformation of the reversing mechanism, which can occur due to thermal expansion and heat, and can be quite guaranteed to avoid damage to the foils. In addition, the primary and secondary window foil can be cooled simultaneously without the use of bulky equipment in contrast to conventional cooling method, since the secondary window foil simultaneously cooled reversionary cooling gases.

1. The cooling method of the window foil accelerator electron beam scanning type, containing the scanning tube, the primary window foil double window, attached to the outlet of the scanning tube, and the secondary window foil, located on the part of the atmosphere from the primary window is knosti on both sides for cooling the primary window foil, reversiruyut the flow of cooling gas in the center of the primary window foil and carry out the circulation of cooling gases by suction of cooling gases on both sides of the surface scanned by the electron beam, for simultaneous cooling of the secondary window foil.

2. The cooling method of the window foil under item 1, characterized in that the center of the primary window foil is supported with Central supports are placed in a scanning tube of the accelerator, and the reversal of the cooling gas is carried out by using the primary window foil curved shape and form of the remote end of the Central support.

3. The cooling method of the window foil under item 2, characterized in that the primary window foil is attached to the outlet of the scanning tube with flange for mounting of the foil, and the curvature of the primary window foil support due to the location of the remote end of the Central support flush or protruding in the direction of the atmosphere on the end surface of the flange for mounting the foil.

4. Device for cooling the window foil accelerator electron beam scanning type, comprising a scanning tube of the primary window foil DV is in the atmosphere from primary window foil, flange for attaching the window foil to the outlet of the scanning tube, a Central support, is placed in the scanning tube, to maintain the primary window foil, and the gap for the injection of cooling gas supplying cooling gas to the surface of the window foil, characterized in that the gap for the injection of cooling gas is made along both sides of the primary window foil opposite each other so that the cooling gases are reversed in the center of the primary window foil.

5. Device for cooling the window foil under item 4, characterized in that the primary window foil is attached to the outlet of the scanning tube with flange for installation of the window, and the remote side of the Central bearing is flush or protruding towards the atmosphere from the end surface of the flange for mounting of the window.

6. Device for cooling the window foil under item 4, characterized in that the suction channels for output cooling gases are made along both sides of the secondary window foil facing each other.

7. Device for cooling the window foil under item 5 or 6, characterized in that the Central support contains channels for cooling water, vypolnen the p. 4 - 7, wherein the outer perimeter of the primary window foil is held opposite the flange to install Windows using the retaining plate.

 

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