The accelerator of charged particle beams

 

The invention relates to accelerators, beams of charged particles, in particular electrons, and can be used in physics, chemistry and medicine. In the accelerator of charged particle beams, comprising a metal shell within which is placed a layer of dielectric material, and a vacuum channel for the passage of electrons, is made along the Central symmetry axis of the metal shell, the inside of the metal shell are additional layer of ferroelectric material; a layer of ferroelectric material may be placed between the metal shell and the layer of dielectric material; a layer of ferroelectric material can be placed inside the layer of dielectric material. The technical result is ensured by the control parameters of the accelerator and you can adjust the synphasicity beam of charged particles and accelerating them waves. 2 C.p. f-crystals, 2 Il.

The invention relates to accelerators, beams of charged particles, in particular electrons, and can be used in physics, chemistry and medicine.

Known accelerator of charged particle beams, comprising a metal shell within which o f the m and along the Central axis of symmetry inside the dielectric material includes a vacuum channels for migration of charged particle beams, see stunning Kerning and other “ANNULAR BEAM DRIVEN HIGH GRADIENT ACCELERATORS”, proceedings of the conference “Beam Proceeding 1988, 7thInternational Conference High-Power Particle Beams, pp.864-869 (reference copy attached).

The disadvantage of this accelerator is that the bunch of charged particles is unstable and after a short span deposited on the inner wall of the shell.

Also known accelerator of charged particle beams, comprising a metal shell within which is placed a layer of dielectric material, and a vacuum passage along the Central axis of symmetry of the metal shell, see W. Gai and other Experimental Demonstration of Wake-Field Effects in Dielectric Structures, PHYSICAL REVIEW LETTERS, vol.61, No. 24, pp.2756-2758, 12.12.1988 (reference copy attached).

This solution is taken as the prototype of the present invention.

Its disadvantage is the ungovernability of the parameters of the accelerator; due desinfecte beam of charged particles and accelerating waves reduces the efficiency of the acceleration.

The present invention is based on a solution of the problem of controllability parameters of the accelerator and, accordingly, vozmojnoe charged particles, includes a metal shell within which is placed a layer of dielectric material, and a vacuum channel for the passage of electrons, is made along the Central symmetry axis of the metal shell, the inside of the metal shell are additional layer of ferroelectric material; a layer of ferroelectric material may be placed between the metal shell and the layer of dielectric material; a layer of ferroelectric material can be placed inside the layer of dielectric material.

The applicant has not identified the sources containing information about technical solutions, identical to the present invention, which allows to make a conclusion about its compliance with the criterion of "novelty".

Thanks to the implementation of the distinguishing features of the invention, the object acquires a very important new feature: it is possible to adjust synphasicity beam of charged particles and accelerating them waves. The applicant did not know of any sources of information which are information on the accelerators of charged particle beams additional layer of ferroelectric material and thereby providing control parameters of the accelerator.

This obstoyalo “inventive step”.

The invention is illustrated by drawings, which shows:

in Fig.1 is a cross-section of the accelerator; a layer of ferroelectric material is placed between the metal shell and the insulator;

in Fig.2. - the cross-section of the accelerator; a layer of ferroelectric material is placed inside the layer of dielectric material.

The accelerator of charged particle beams includes a metal casing 1, within which is placed a layer 2 dielectric material and a vacuum channel 3 made along the Central symmetry axis of the metal shell 1. As the dielectric material can be used high-frequency ceramic materials with dielectric constants ranging from 4 to 45. The basis of these dielectrics comprise oxide system - compounds and solid solutions, such as cordierite (2MgO2Al2O3·5SiO2with4.7, corundum (Al2About3with9.7, the titanates of magnesium and calcium in the system MgO-CaO-TiO2from 14 to 20, as well as solid solutions titanate calcium-aluminates rare earth elements Satio3-LnAlO3(Ln-La, Nd)c

Inside of the metal shell 1 has also a 4 layer of ferroelectric material; it can be placed between the metal shell 1 and layer 2 dielectric material (Fig.1) or within the layer (Fig.2). The ferroelectric material in the specific example is a solid solution of barium titanate and strontium (Ba, Sr)Tio3with the addition of oxides and compounds of various elements. The dielectric constant is in the range from 200 to 600, a tgin the range of 10...35 GHz is equal to 0.004 0.006.... This manageabilitythe electric field is in the range (5-15)%. When the above parameters, the high-frequency ceramics and ferroelectric material handling accelerator structures will bedepending on the thickness control of the ferroelectric layer and the specific values of the dielectric constant.

The device operates as follows. In the accelerator of the injector known type serves a high current beam of charged particles of low energy, in the specific example, electrons with energy 15-50 MeV, pulse duration of 10-40 and not charge 10-100 MK. This beam excites in the full beam of high energy electrons (>100 MeV), pulse duration of 10-40 and not charge less than 0.1 MK. The low-voltage electron beam accelerated in the field of high-frequency electromagnetic waves and excite high-current electron beams. To ensure the correlation of low-voltage electron beam and a high-frequency electromagnetic waves create a DC electric field in layer 4 of ferroelectric material; it is carried out in a specific example, by feeding it through the applied metal contacts (not shown) of a DC electric voltage. The intensity of the DC electric field is from 1 to 10 V/μm. Changing the value of this parameter you can change the dielectric constant of the ferroelectric material and thus to adjust the frequency and, accordingly, the phase velocity of the electromagnetic wave relative to the speed of the electron beam.

For the implementation of the invention used known materials and technical tools that allow to make a conclusion about its compliance with the criterion “industrial applicability”.

Claims

1. The accelerator of charged particle beams, comprising a metal shell inside of which is placed with the symmetry of the metal shell, characterized in that the inside of the metal shell are additional layer of ferroelectric material.

2. The accelerator of charged particle beams under item 1, characterized in that the layer of ferroelectric material is placed between the metal shell and the layer of dielectric material.

3. The accelerator of charged particle beams under item 1, characterized in that the layer of ferroelectric material is placed inside the layer of dielectric material.

 

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SUBSTANCE: proposed method for impact compression of material involves use of relativistic vacuum diode that has axisymmetrical vacuum chamber with electricity conducting walls, plasma cathode, and concentrating anode. Target in the form of axisymmetrical part is produced from condensed material and is used at least as part of concentrating anode. The latter is installed in relativistic vacuum diode in a spaced relation to plasma cathode and pulse discharge is applied from power supply to relativistic vacuum diode as electron beam is self-focused on concentrating anode surface. For the purpose use is made of axisymmetrical plasma cathode in the form of conducting rod and butt-end dielectric member coupled to the latter; surface area of conducting rod in dielectric member is larger than maximal cross-sectional area of concentrating anode. Concentrating anode is installed in a spaced relation to plasma cathode so that center of curvature of concentrating anode working surface is disposed within focal length of collectively self-focusing electron beam.

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