Explosive Magnetic Generator Research Articles

Разработка плазмофокусного нейтронного источника, запитываемого от взрывомагнитного генератора

Разработка плазмофокусного нейтронного источника, запитываемого от взрывомагнитного генератора

Development of a plasma focus neutron source powered by an explosive magnetic generator

This paper presents the results of laboratory and explosive experiments with a plasma focus discharge Mather-type chamber at a discharge current amplitude of 1.3–1.4 MA. It has been found that in laboratory experiments, the yield of a deuterium-deuterium neutrons reached 1011, and in an explosive experiment using the chamber filled with a deuterium-tritium gas mixture, the integral yield of a deuterium-tritium neutrons with an energy of 14 MeV was more than 1012 neutrons.

Experiments of cylindrical isentropic compression by ultrahigh magnetic field

The high Explosive Magnetic Flux Implosion Compression Generator (EMFICG) is a kind of unique high energy density dynamic technique with characters like ultrahigh pressure and low temperature rising and could be suitable as a tool of cylindrical isentropic compression. The Institute of Fluid Physics, Chinese Academy of Engineering Physics (IFP, CAEP) have developed EMFICG technique and realized cylindrical isentropic compression. In the experiments, a seed magnetic field of 5–6 Tesla were built first and compressed by a stainless steel liner which is driven by high explosive. The inner free surface velocity of sample was measured by PDV. The isentropic compression of a copper sample was verified and the isentropic pressure is over 100 GPa. The cylindrical isentropic compression process has been numerical simulated by 1D MHD code and the simulation results were compared with the experiments. Compared with the transitional X-ray flash radiograph measurement, this method will probably promote the data accuracy.

Testing and revision of the parameters of a system for liner driving to 20 km/s

The paper presents the results of model experiments to test a new field liner driver based on the disk explosive magnetic flux compression generator, results of driver development, and revised two-dimensional magnetohydrodynamic simulations of liner implosion.

Electrically exploded opening switches in high-current explosive magnetic generators

This paper presents a review of publications on the use of electrically exploded foil opening switches to form current pulses up to 100 MA (up to 45 MA in experiments) with a rise time of 0.1–10.0 µs. Physical schemes and models are considered, and the efficiency of foil opening switches for existing and advanced facilities is analyzed.

Disc explosive magnetic generator of small class size

This paper discusses one type of power generators—a disk explosive generator with flat disk elements and metal inserts. A technique of numerical simulation of the operation of this generator is proposed. The principle of operation and the design of the disk explosive magnetic generator are described. The results of calculations and experiments are presented.

Explosive magnetic pulsed power system for thermonuclear ignition by Z-pinch x-radiation

A device based on a super-power disk explosive magnetic generator for producing an x-ray pulse with energy exceeding the target ignition threshold is presented and substantiated.

Method of generating a mega-ampere current pulse to accelerate a liner by a magnetic field

This paper describes a method and device for generating a mega-ampere quasi-trapezoidal current pulse of given amplitude and duration in a liner load. The experimental device consisting of a current source based on a helical explosive magnetic generator (HEMG) produced a current pulse in the liner load with an amplitude of ≈ 10 MA and controlled duration and current rise and decay times. The use of this source to accelerate cylindrical liners allows the study of the mechanisms of material damage in converging geometry, in which new damage effects may occur due to the multidimensional nature of the loading conditions.

Дисковые взрывомагнитные генераторы энергии малого класса

Дисковые взрывомагнитные генераторы энергии малого класса

Электровзрывные размыкатели сильноточных взрывомагнитных генераторов

Электровзрывные размыкатели сильноточных взрывомагнитных генераторов

Explosive magnetic source of current with controllable output voltage

The paper describes a small-size explosive current source with controllable output voltage shaping a megaampere current pulse. This energy source comprises a helical explosive magnetic generator and an explosive sectionalized current opening switch and is designed to power gas-discharge chambers of the plasma focus type. Control of the output voltage of the pulsed current source is performed in such a manner that in each of the series-connected sections of the explosive current opening switch, voltage is generated with a given time shift relative to the neighboring section.

Model of a disk-shaped explosive magnetic generator with a submicrosecond current pulse magnetodynamic shaper in a liner load

A model of a disk-shaped explosive magnetic generator 400 mm in diameter with an initial energy storage capacity of about 40 MJ is considered. The generator is integrated with a cumulative current pulse shaper and is also equipped with a remote magnetodynamic interrupter. Calculations show that this generator is capable of forming current pulses with an amplitude of up to 20 MA and a rise time of about 130 ns in finiteinductance (∼10 nH) dynamic loads. This allows rapid (for about 60 ns) compression of light (20–30 mg) liners to generate intense beams of soft X rays. Results obtained using a computational model of the magnetodynamic interrupter, which is the key component of the generator, are verified experimentally.

Research on Indirect Charging Radio Frequency Explosive Magnetic Flux Compression Generator

It is necessary to make full use of explosive energy and reduce the loss of unnecessary energy when we study high-powered radio frequency explosive magnetic flux compression generator . Therefore, this paper proposed that indirect charging was used in radio frequency explosive magnetic flux compression generator. Based on the equivalent circuit theory, we studied the interaction of two loops in the case of indirect charging. The numerical simulation results showed that we must choose appropriate circuit parameters of charging in order to guarantee the radio frequency explosive magnetic flux compression generator to run steadily.

Damage growth and recollection in aluminum under axisymmetric convergence using a helical flux compression generator

Damage initiation and evolution, failure, and recollection processes under axisymmetric convergence were studied in the Russian-Damage experimental series, a joint effort between the Los Alamos National Laboratory and the All-Russian Institute of Experimental Physics. A helical explosive magnetic generator was used to drive a cylindrical liner shell to produce shock wave loading of a concentric cylindrical target shell. Shock wave amplitude was controlled by the liner-to-target spacing and by the magnetic field amplitude. Variation of the current pulse duration produced either a single impact, to study damage initiation through failure, or a double impact, to study failure with recollection. Both full and partial recollection of the main crack was obtained. By fielding high-precision diagnostics to measure the dynamic drive conditions and material response and by employing post-shot metallographic analysis, this project produced well-characterized experimental data across a range of damage and recollection levels for the chosen material, aluminum. We present selected experimental results to illustrate the methodology and utility of this experimental technique.

爆磁压缩发生器与高阻抗负载匹配调制电路

爆磁压缩发生器与高阻抗负载匹配调制电路

Rheology studies of aluminum with the use of explosive magnetic generators

Rheology studies of aluminum with the use of explosive magnetic generators

Influences of Capacitance Value Changing in Explosive Magnetic Frequency Generator

Radio frequencies explosive magnetic flux compression generator, which use capacitors as the load, is a kind of maneuverable device for generating and radiating electromagnetic pulse. From the equivalent circuit principle analysis on explosive magnetic frequency generator, the influence of capacitance variation discipline on operation current and oscillation frequency is analyzed based on the further analysis of the influence and comparison of inductance variation discipline on time and frequency characteristic of operation current. Then the center frequency of operation current under the circumstance of adopting different capacitance value when dynamic inductance linear changing has been calculated by software programming.

An ICF system based on Z-pinch radiation produced by an explosive magnetic generator

It is known that a thermonuclear target can be ignited by an implosion accomplished with X-radiation generated by means of laser radiation conversion or by a Z pinch formed by a high-power current pulse. For these purposes laser facility NIF has been constructed in the USA, ‘Megajoule’ is being constructed in France and there is a project of laser facility UFL in Russia. The project of stationary facility X has been developed in SNL USA to produce a Z pinch capable of generating an x-ray pulse with parameters close to the ignition threshold. There is a great chance, however, that the already tested technologies, including disc explosive magnetic generators (DEMG), systems of current peaking based on electrically exploded foil opening switches and high-voltage switching devices, allow the intriguing problem of the ignition feasibility to be solved and the quickest and cheapest way to accomplish this to be provided. To explore this possibility, the paper will sequentially analyse the ignition conditions. The required parameters of Z pinch X-radiation and the size of the DEMG-based facility to obtain these parameters will be evaluated. Capabilities of the new current sources based on the DEMG and of the devices shaping a current pulse will be presented and compared with those required for the ignition.

Magnetic cummulation generators applied for rapid charging of forming lines

We describe an off-line nanosecond charging device for a short forming line; the device has been created on the basis of an inductive energy storage unit. Energy storage is carried out by the current of an explosive magnetic cumulation generator, and the energy output to the load, by means of an electroexplosive current interrupter. The use of a two-stage, instead of a one-stage, magnetic cumulation generator, consisting of a preamplifier and a dynamic transformer, and two smaller-size generators with sequential connection of secondary windings of dynamic transformers, one of which is connected to the inductive storage unit, and the other, to the current interrupter—has made it possible to substantially increase the line charge voltage. As a result, within a time on the order of 100 ns, it was possible to charge a forming line with an electric length of 5 ns to a voltage of ≥1 MV.

Magnetodynamic submicrosecond current interrupter

The feasibility of using a magnetodynamic current interrupter for switching multimegaampere current pulses is considered. The operation of the interrupter is based on the fast buildup of edge instabilities. A technical solution is suggested, and the performance of the interrupter when used in the second stage of peaking the current of helical explosive magnetic generators (HEMGs) and capacitor banks is predicted. It is shown by computer simulation that the interrupter can operate in the submicrosecond range and switch currents as high as several tens of megaamperes, the operating speed of the interrupter increasing with linear current density. The limit actuation time of the interrupter may be on the order of 100 ns. A prototype of the interrupter is experimentally verified on a capacitor setup by switching currents with an amplitude of 4.3–4.5 MA.