The final window of the electron accelerator

 

(57) Abstract:

Usage: in accelerator technology and may find application in radiation technologies using electron irradiation, such as disinfection of grain, preservation of food, radiation chemistry, including gas treatment, crosslinking of polymers and other inventive in the final window of the electron accelerator containing a flange with a hole, closed transparent for electrons foil from the supporting substrate, the latter is made of pyrocarbon tissue. The invention allows to produce large magnitude currents (units amps) with low energy loss in the exhaust box, which increases the efficiency of the exhaust box. 1 Il.

The invention relates to accelerator technology and may find application in radiation technologies using electron irradiation, such as disinfection of grain, preservation of food, radiation chemistry, including gas treatment, crosslinking of polymers and other

You know the final window of the electron accelerator containing a flange with a hole, closed transparent for electrons foil [Abrahamian, E. A. Industrial electron accelerators-M. Energoatomizdat, 1986, S. 165-172]

N. the diameter of the round window is necessary to increase the thickness of the foil, which reduces its transparency and density of the noise current. In the end, the value of the output current does not depend on the diameter of the window, and in the case of aluminum foil is 10-2A.

The closest technical solution is the final window of the electron accelerator [see ibid., S. 168] contains a flange with a hole, closed transparent for electrons foil from the supporting substrate. As a supporting substrate using metal ribs located at a distance l from each other. The beam is cut ribs into pieces, each of which produced a piece of foil in the form of ribbons. If the width of each ribbon l, the total length of all ribbons b, such that the window transmits the current in the b/l times greater than the "basic window" in the form of a square with side length l. The current through this "simple window" (like round Windows) does not depend on the size l in the case of aluminum foil is about 510-3A. Thus, the total current window may be increased to any desired value.

The disadvantage of such outlet ports are loss of beam current on the edges that make up 30-40% of its value.

The technical result of the invention is to reduce losses current puckorius, contains a flange with a hole, closed transparent for electrons foil from the supporting substrate, the supporting substrate is made of pyrocarbon tissue.

The drawing shows a diagram of the exhaust window.

The window contains the flange 1 with a hole, closed by a supporting substrate 2, made of pyrocarbon fabric and foil 3. Foil vacuum-sealed to the flange by means of a gasket 4 and divides the vacuum volume of the accelerator (in the drawing to the left of the foil) and the atmosphere (right).

The outlet box is as follows.

Electron beam falls on the window on the vacuum side. The maximum amount of current through a window is determined by the material properties of the foil. The density of power losses in the foil (1) Pp~ jhz, where j is the current density of the beam, h is the thickness of the foil, z the charge of the nuclei of the foil material, the density of the foil. The thickness of the foil is determined by the linear dimensions of the foil (diameter) l and its specific strength :

(2) h~1/ power Density, remove from foil atmosphere, will be

(3) PCH~T/h, where is thermal conductivity of the foil, T permissible operating temperature at which there is no significant reduction in mechanical properties of the foil. From (1) to(3) April per unit of measurement of such quantities then used in the exhaust boxes titanium K=2, beryllium K=2,5. For pyrocarbon K=200 and, accordingly, the current flowing pyrocarbon film (cloth) is 2 A. Consideration of thermal radiation will increase noise current. In the final window pyrocarbon fabric is used as transparent for electrons supporting vacuum-tight thin foil substrate. The foil thickness is determined from (2), much less than that which allows technological capabilities, and really she is 5 μm for titanium and 10 μm for aluminum. Perhaps the coating on the fabric of a vacuum-tight metal layer thickness of about 1 μm.

Consider the example of execution of the outlet window of the accelerator with electron energy 1 MV and a current of 0.5 A. There are programs calculate the passage of electrons through matter, but easier to use tabular data, for example, from [Baranov, C. F. Dosimetry of electron radiation. -M. Atomizdat, 1974] when the mass thickness of the pyrocarbon tissue 0.03 g/cm2and aluminum foil 2,710-3g/cm2the energy loss of the beam will be about 1% of the Diameter of the window will be 6 see

Thus, the invention allows to produce large magnitude currents (units amps) with low losses Oronogo accelerator, contains a flange with a hole, closed transparent for electrons foil from the supporting substrate, wherein the supporting substrate is made of pyrocarbon tissue.

 

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