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Explosive Pulsed Power: An Enabling Technology

100%
Altgilbers L.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 6
1040-1043
EN
Explosive pulsed power consists of those devices that convert the chemical energy in explosives into electrical energy. In 2004, a series of programs were initiated to develop several types of very compact explosive pulsed power generators. Based on these recent efforts, we now have a better understanding of the weaknesses and strengths of these small generators. As a result, we can now build reliable generators that provide consistent output currents and voltages. In this paper, a brief introduction to these generators will be given along some of the most recent advances in our understanding of them. A description of an explosive driven high power microwave test bed being built at Texas Tech will be presented. This test bed can be used to test the effects of electromagnetic radiation on electronics. A brief description of some applications of explosive pulsed power will also be presented.
2
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Study of Candidate Insulating Materials for Use in Shock Wave Switches

63%
Kolosenok S., Altgilbers L.
Acta Physica Polonica A
|
2009
|
vol. 115
|
issue 6
1010-1012
EN
One challenge in high power switching is to have a compact switch, which can hold off high voltages and close rapidly at the proper time. Most high power switches are large or complicated, such as triggered spark gaps. Typical opening switches are also not compact and often have too long switching time. It has been shown previously that certain insulating materials undergo a drastic change in conductivity under shock loading. Using such a material could greatly reduce the size of a switch. We will report on our continuing studies of different candidate materials for shock wave switches.
3
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Analytical Model for Explosive-Driven Ultracompact Shock-Wave Ferromagnetic Generators

51%
Talantsev E., Shkuratov S., Baird J., Altgilbers L.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 6
1028-1030
EN
An analytical model of the operation of recently invented ultracompact explosive-driven shock-wave ferromagnetic generators that utilize longitudinal (shock wave propagates along the magnetization vector) and transverse (shock wave propagates across the magnetization vector) shock wave demagnetization of Nd_{2}Fe_{14}B hard ferromagnets, and an analytical technique for calculation of amplitudes of the current pulse produced by the generators were developed. The model utilizes the magnitude of the energy product, (BH)_{max}, and the magnetostatic energy of the hard ferromagnetic element of the ferromagnetic generator as parameters for determining ferromagnetic generator pulse generation, and it does not consider the magnitude of remnant magnetization, B_{r}, of the ferromagnetic material. The developed technique for calculation of the current pulse amplitude produced by the ferromagnetic generator provides comprehensive and accurate results. Amplitudes of calculated ferromagnetic generator output currents are in good agreement with experimentally obtained data.
4
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High Pulsed Magnetic Field Sensor Based on La-Ca-Mn-O Thin Polycrystalline Films

39%
Balevičius S., Žurauskienė N., Stankevič V., Keršulis S., Novickij J., Altgilbers L., Clarke F.
Acta Physica Polonica A
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2005
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vol. 107
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issue 1
207-210
EN
It is demonstrated that polycrystalline La_{0.33}Ca_{0.67}MnO_3 thin film sensors can be used to measure pulsed strong magnetic fields with microsecond duration rise and decay times. The response characteristics of these sensors were investigated using 0.7-1.0 ms duration bell-shaped magnetic field pulses of 10-20 T amplitudes and by using special waveform magnetic field pulses with amplitudes of 40 T and decay times of 50μs. The response of these magnetic field sensors was compared with those of conventional loop sensors and Faraday rotation sensors using Bi_{12}SiO_{20} single crystals as a known standard.
5
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Electroresistance of La-Ca-MnO Thin Films

33%
Cimmperman P., Stankevič V., Žurauskienė N., Balevičius S., Anisimovas F., Paršeliūnas J., Kiprijanovič O., Altgilbers L.
Acta Physica Polonica A
|
2004
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vol. 105
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issue 1-2
107-114
EN
Epitaxial, textured, and polycrystalline La_{0.7}Ca_{0.3}Mn O_3 films, having about 150 nm thickness, were prepared by pulsed laser deposition techniques onto (110) NdGaO_3, MgO and lucalox substrates and investigated using 10 ns duration, 0.5 ns rise time electrical pulses having amplitude up to 500 V. Electroresistance of the films [R(E)-R(0)]/R(0) was investigated up to 80 kV/cm electric field strengths in temperatures ranging from 300 K to 4.2 K. Strong (up to 93%) negative electroresistance was obtained in polycrystalline La_{0.7}Ca_{0.3}MnO_3 films prepared on MgO and lucalox substrates. The epitaxial films grown on NdGaO_3 substrate demonstrated only a small resistance change due to Joule heating induced by a current pulse. It was concluded that electroresistance manifests itself in strongly inhomogeneous manganites films exhibiting a large number of structural imperfections producing ferromagnetic tunnel junction nets.
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