SU683510A1 - Explosion magnetic generator - Google Patents

Description

The invention relates to techniques for producing pulsed superstrong magnetic fields using explosive deformation of a magnetic flux and can be used in many fields of modern physics that require large concentrations of energy. Explosive magnetic generators (VMGs) are known for producing superstrong magnetic fields with a solenoidal coil 1 as a means of creating an initial magnetic flux located inside an explosive charge [1J

Such generators consist of a ring of 1 explosive (BB ¹ ) and a metal cylinder located coaxially with it, and the initial magnetic flux inside the cylinder is created by a solenoidal coil 2 placed between the cylinder and the BB ring. The coil is powered from the energy source of the initial magnetic field, the magnetic flux created by it diffuses through the 2 walls of the cylinder and at the time of the maximum initial magnetic flux. The cylinder begins to collapse under the action of a shock wave excited by the explosive charge. The collapsing Qi / 2 lindr compresses the mag- | thread flux, thereby increasing the initial magnetic field.

With this design, the HMG has significant energy losses due to the diffusion of the magnetic field through the cylinder wall.

Also known explosive generator of superstrong pulsed magnetic fields, containing means for creating an initial magnetic field, capture it and subsequent compression and located outside the means of explosive deformation £ 2j.

Such a VMG has an explosive ring and a cylinder inside it, made in the form of a single-turn solenoid, the energy supplies to which are placed in a radial section of the explosive ring. Under the action of the shock wave, the gap in the solenoid closes, it acquires conductivity in the azimuthal direction, captures the magnetic flux and compresses it with further movement to the center.

With such a design, the VMG section., Of a converging shock wave - in the form of a circular cylinder, as a result of which compression symmetry deteriorates sharply ”the gap in a single-turn solenoid is a stepwise violation of cylinder uniformity, which leads to the formation of jets and rapid destruction of the generator; operating mode of the solenoid in the process of powering off. The energy source is notable for significant tension, since all the voltage of the energy source is applied to the gap (and it is desirable to reduce it for reasons of compression symmetry), and in this gap, ponderomotive forces are concentrated, the action of which leads to destruction of the insulation in the gap - the result is a reduced reliability of operation, in the process of powering the inner layer of the solenoid is subject to high current loads, since at a high speed of powering caused by the low inductance of the solenoid and the need to apply Inertial confinement, all current is concentrated in the skin layer, which leads to overheating and even explosion of the inner surface of the cylinder, a change in the inductance of a single-turn solenoid will require a change in the dimensions of the explosive ring, i.e. practically making a new generator.

The aim of the invention is to improve the symmetry of compression.

This is achieved by the fact that the means for creating the initial magnetic field, capturing it and subsequent compression are made in the form of a multi-input multi-layer coil.

the inner diameter of the ring BB 2 is removed from the mandrel cylinder, the wires on both sides of the coil are protected and soldered (or welded) to the conductors 3.

The coil is powered from the energy source of the initial magnetic field, and a converging shock wave is initiated in the explosive charge so that it reaches the outer surface of the coil at the maximum initial magnetic flux. After the shock wave passes through the coil, the wires are welded under its influence, forming a continuous homogeneous conducting cylinder that captures the initial magnetic flux and compresses it with its further movement to the center, strengthening the initial magnetic field.

In the proposed design of the VMG, the use of a continuous explosive ring is provided, and the gap between the wires in the layer is hundredths of a millimeter, and the wires of the other layer are under the gaps of one layer, after the shock wave passes, the gaps between the wires are filled and the cylinder thickness undergoes only very

Memory weak changes. The quasiharmonic character of this initial perturbation of the thickness and the high harmonic number of this perturbation lead to their smoothing during compression.

In FIG. 1 shows a General view in section of the proposed generator, and in FIG. 2 is a cross-sectional view of a part of a multi-start multi-layer coil. ‘40 'Multi-start multi-layer coil 1 is made of insulated copper wire type PEV-2 with a diameter of 0.12-03 mm as follows. Several turns with a pitch of the order of or more than the diameter of the cylinder are laid on the mandrel cylinder of the corresponding diameter. Next to this wire, next wires are laid right and left next to it, and so on, wire to wire, until the entire cylinder is covered with a layer of wires, after which a second layer is wound, the wires of which are laid in the gaps between the wires of the first layer. The winding pitch for the same working length of the coil and its diameter / determines its inductance, and the number of layers is the mass of the coil. After winding the required number of layers, the working length of the coil is wrapped with several layers of 40 fiberglass and impregnated under vacuum with a compound based on epoxy resins. Then the coil is ground

An increase in the reliability of the coil during the creation of the initial magnetic field is due to the fact that the supply voltage is applied along the entire circumference and when a large number of wires (number of runs) between adjacent wires, a voltage of 100-200 V is applied, the mechanical forces are distributed along the circumference , and the multilayer coils leads to a strong increase in the thickness of the skin layer and therefore to a lower current density. The inductance of a multi-start multilayer coil is easily changed by changing the winding pitch and, with the same dimensions, can be less than the inductance of a single-turn solenoid.

Claims (1)

54) EXPLOSION-GENERATOR is a stepwise violation of the cylinder uniformity, which leads to the formation of jets and the rapid destruction of the generator; mode of operation of the solenoid in the process of power from. The energy source is significantly stressful, since all the voltage of the energy source is applied to the gap (and it is desirable to reduce it due to compression symmetry), and in this gap, ponderomotive forces are concentrated, the action of which leads to the destruction of the insulation in the gap - a consequence of this is reduced reliability of operation; in the process of powering the inner layer of the solenoid is subject to high current loads, since at high speed of powering, caused by the small inductance of the solenoid and the need Neny inertial retention, all of the current is concentrated in the skin layer, leading to overheating and even explosion inner surface of the cylinder, single-turn coil inductance change would require changes BB ring size, i.e. practically making a new generator. The purpose of the invention is to improve the symmetry of compression. This is achieved by the fact that the means for creating the initial magnetic field, capturing it and subsequent compression are made in the form of a multi-input multi-layer coil. FIG. 1 shows a general view of the proposed generator in section, and FIG. 2 .- cross section of a part of a multi-feed multi-layer coil. A multiple-use multi-layer coil 1 is made of copper insulated wire of the type PEV-2 with a diameter of 0.12-03 mm as follows on the cylinder-mandrel of the appropriate diameter with this wire several turns are placed with a step of the order of or greater than the diameter of the cylinder. Next wire next to the right and left next to this wire, and so on, wire to the wire until the entire cylinder is covered with a layer of wires, after which the second layer is wound, the wires of which are placed between the wires of the first layer. The winding pitch with the same working length of the coil and its diameter determines its inductance, and the number, layer B, is the mass of the coil. After winding up the required number of layers, the working length of the coil is wrapped with several layers of fiberglass and impregnated under an epoxy resin-based compound. Then the coil is turned around under the internal diameter of the ring BB 2, removed from the cylinder-mandrel, wire, ki on both sides of the coil of protection-. The solder is fed from the energy source of the initial magnetic field, and in the explosive charge, a converging shock wave is initiated so that it reaches the internal magnetic field at the time of maximum of the initial magnetic flux. After the shock wave passes through the coil, the wires under its influence are welded to form a continuous homogeneous conductive cylinder that captures the initial magnetic flux and, with its further movement to the center, compresses it, increasing the initial magnetic field. In the proposed design of the VGH, a continuous ring of explosives is provided, and the gap between the wires in the layer is one hundredths of a millimeter, and the gaps of one layer are wires of the other layer, after the passage of the shock wave, the gaps between the wires are filled and the cylinder along the circumference experiences only very weak changes. The quasiharmonic nature of this initial perturbation of thickness, the high harmonic number of this perturbation, leads to their smoothing during compression. Improving the reliability of the coil in the process of creating the initial magnetic field due to the fact that the power supply voltage is applied along the entire circumference and with a large number of wires (number of passes) between the adjacent wires a voltage of 100-200 V is applied, and the mechanical forces are distributed along the circumference, and the multi-layer coil leads to a strong increase in the thickness of the skin layer, hence to a lower current density. The inductance of a multiple-input multi-layer coil is easily changed by changing the winding pitch and, with the same dimensions, it may be less than the inductance of a single-turn solenoid. Claims An explosive magnetic generator of ultrastrong pulsed magnetic fields, containing means for creating an initial magnetic field, capturing it and subsequent compression, and located outside the means for explosive deformation, characterized in that, in order to increase symmetry, compression, means for creating an initial magnetic the floor, its gripping and subsequent compression are made in the form of a multiple coil. Sources of information taken into account in the examination Knopfel. Superpowered magnetic fields, M ,, Mir, 259, fig. 9.20b, Kyopfel. Super-strong magnetic field. M., Mir 259, fig. 9.20g. (proto  / y: u /// Sh 7 // ////// 2 / // fu2. { .g