Search

One of the perspective directions in high-energy-density physics is the creation of powerful electro physical facilities capable to form megampere current pulses with short front. This paper presents test results of the device based on five-element disk magnetocumulative generator DMCG480 and an explosive current opening switch. The current pulse of 15 MA with characteristic rise time of \sim 0.8~\mu \texts was obtained in the equivalent multiwire array load of 17 nH at circuit breaking with the current of 32 MA. [ABSTRACT FROM AUTHOR]

Matching devices in the form of electro-exploded current opening switches (EEOSs) or explosive current opening switches (EOSs) are used for transforming current pulses of magnetocumulative generators (MCGs) into voltage pulses of hundreds of kilovolts at high-impedance loads. Current pulse sharpening is accompanied by significant losses of the stored energy. Using EOSs are more preferable to EEOSs from the point of view of the energy losses since it does not lead to efficiency decrease in the MCG operation. This paper considers magnetocumulative multimodule systems consisting of several synchronously operating and serially connected small helical MCGs. Each generator is equipped with an explosive current opening switch. The voltages generated at each opening switch are summarized into the load. Fast operation of MCGs allows using very thin foils in the opening switches and obtaining the short voltage pulse front. Results of the works on creating high-voltage devices based on helical MCGs of a 60-mm diameter and disk EOSs of a 200-mm diameter are presented in this paper. In the experiment, the device consisting of two modules provides a voltage pulse of 370 kV with a rise time of $\sim 170$ ns into a load of 29 $\Omega $ and an inductance of 0.5 $\mu $ H. Maximum power in the load is $\sim 4.3$ GW, and the emitted energy is $\sim 1.1$ kJ. The four-module device forms the pulse with the characteristic current rise time of $\sim 100$ ns in the similar load at twice smaller current. [ABSTRACT FROM PUBLISHER]

Nowadays, disk magnetocumulative generators (DMCGs) are the most powerful and power-consuming magneto-cumulative generators (MCGs). The problem of necessary initial energy supply to the generator circuit is very urgent at creating high-performance disk generators. Preliminary energy amplification in experiments with DMCG is provided with helical MCGs. Along with preset energy supply, the preamplifier should have small characteristic current rise time. It is necessary for decreasing thermal and mechanical supply current effect on elements of the disk generator. This means increasing the output power of the preamplifier and associated with obtaining maximum possible initial energy in the DMCG. Initial inductance and resistance of the DMCG circuit became higher with an increase of the DMCG sizes and the number of its elements. This required increasing the power of earlier used preamplifiers. This paper presents experimental results of the MCG-240 characteristics improvement at the expense of turns distribution change and application of more powerful explosive. Other possibilities of the preamplifier power increase are considered in this paper. [ABSTRACT FROM PUBLISHER]

High-inductive helical magneto-cumulative generators (MCGs) of 50- and 80-mm diameters intended for a plasma focus (PF) powering are created in VNIIEF. High energy gain, efficient operation into loads to 50 nH, and the possibility of application in combination with the current opening switches are the distinctive features of the generators. Having small sizes and masses, these generators produce current pulses from 400 kA to 1 MA with the rise time of ∼0.5 μs powered with the energy less than 100 J. This paper presents results of experimental research during which the high stability of the MCG operation both on the current amplitude and operation time is shown. Results of the experiments on the PF powered from the MCG, operated in the regime of the magnetic flux extra compression, are presented. The yield of 1012 neutrons per pulse was recorded in the tests with the MCG-80 and PF with D-T mixture. [ABSTRACT FROM AUTHOR]

The first test of a disk magnetocumulative generator (DMCG) with high explosive charges of 480-mm diameter was carried out in the frameworks of a program on creation of an explosive EMIR facility, intended for high-power soft X-ray radiation pulses generation. The generator consists of five disk elements. The inductive load was equal to ∼7 nH. The generator was twice larger than model DMCG240, successfully tested earlier. A comparison of calculation and experimental results is carried out. [ABSTRACT FROM AUTHOR]

The first test of a pulsed power system consisting of a five-element disk magneto-cumulative generator with high-explosive charges of 240 mm diameter and an explosive current opening switch with ribbed barrier was carried out in the frameworks of a program for creating an explosive complex EMIR, intended for the generation of high-power soft X-ray radiation pulses. A current pulse of ∼9 MA with a characteristic rise time of ∼0.6 μs was recorded at opening of the generator circuit with the current of ∼15 MA into a ∼7 nH inductance load. [ABSTRACT FROM AUTHOR]